ILLUSTRATED CATALOGUE OF OPTICAL INSTRUMENTS, MANUFACTURED, .IMPORTED, AND FOR SALE BENJ. PIKE'S SON & CO., MANUFACTURING OPTICIANS, 930 BROADWAY, NEW YORK. li ESTABLISHES t804. NOTICE. Our stock of Optical and Mathematical Instruments of every variety, style, and kind, both of foreign and domestic manufac- ture, is undoubtedly the largest and most extensive to be found in the United States. For this reason we are enabled to offer greater inducements to those in search of such instruments than can be obtained elsewhere. Tn ordering goods from this Catalogue, it is only necessary to give the name, number, and price of the article desired, and the same will be sent with the greatest dispatch. From the prices herein stated no deviation will be made. TERMS CASH. The terms are Cash in current funds, which may be sent with the order, either by check, draft, post office order, or registered letter, or the goods will be sent C. 0. D., provided that twenty-pre per cent, of the amount of the bill is sent with the order, when the balance will be collected on delivery by the express company. All goods will be packed with the greatest care, so as to avoid breakage in transportation; but we cannot be responsible for the same after leaving our premises, except under special contract. Packing boxes will be charged at their bare cost. GOODS SENT BY MAIL Articles of small bulk, not exceeding four pounds in weight, can be sent by mail if enclosed in tin packets (which cost very little), at the rate of one cent per ounce. ILLUSTRATED CATALOGUE OF OPTICAL INSTRUMENTS, MICROSCOPES, TELESCOPES, &C, MANUFACTURED, IMPORTED AND FOR SALE BY BENJ. PIKE'S SON & CO., manufacturing opticians, 930 Broadway, New York. ESTABLISHED 1804. > PREFACE. In offering our new Catalogue of Optical Instruments (embracing Micro- scopes, Telescopes, Opera, Field and Marine Glasses, etc.) to the public, it is our pleasure and privilege to state that, for the purposes intended, they are, each and every one, instruments of superior excellence; and, as repre- sentative productions of the advancement of science and knowledge in the various departments which they represent, they are unsurpassed by any of the celebrated makers of the world. Since the establishment of our business, in 1804, science has, indeed, made great progress, and given to the world the permanent benefit and en- lightenment resulting from its vast researches. In the department of Microscopy, its revelations have been incalculably great, and the perfection to which these instruments have been brought, and the wonderful results attending their use, render them an absolute necessity to the medical stu- dent and practitioner, and their revelations a very essential part of his education. In the department of astronomy, requiring the use of Astronomical Tele- scopes, very important discoveries, resulting from the increased perfection, efficiency and more general use of these instruments, have been obtained, the value of which can never be too highly estimated. As manufacturers of Optical Instruments, it has always been our aim to combine perfection of workmanship, together with all valuable and efficient improvements, with the greatest moderation in prices. The result of producing good instruments at moderate prices has been to bring them within the reach of all, and to popularize and thus increase the demand for them to such an extent, that a better Microscope can be pur- chased to-day for $100 than could be had, a few years ago, for $500, the same being the case with Astronomical Telescopes and other optical instru- ments. We manufacture an Astronomical Telescope, capable of resolving higher tests, for $200, than could be purchased a few years ago for over $1,000. In Opera, Field and Marine Glasses, many improvements have taken place, from the cheapest to the most expensive, and the prices have been very greatly reduced. Our Binocular Telescopes, or Long Range Field Glasses, are the perfection of instruments of this class, combining extraordinary power with the great- est brilliancy of definition, and are well worthy of examination. In every department of our business, our efforts have been to produce first class instruments, and the same at the most reasonable prices, as an examination of the following catalogue will show. Thanking our many friends and patrons for their liberal patronage in the past, we would most respectfully request its continuance from themselves and others in the future, assuring them that, with our extensive facilities for the production and sale of Optical and Mathematical Instruments of every description, we are enabled to furnish the same at the lowest possible prices. BENJ. PIKE'S SON & CO. BENJ. PIKE'S SON & CO., NEW YORK. 1. THE GRAND INTERNATIONAL BINOCULAR MIOROSOOPE. BENJ. PIKE'S SON & CO., NEW YORK. 5 THE GRAND INTERNATIONAL BINOCULAR MICROSCOPE. The Improved Grand International Binocular Microscope has a tripod (A) for its base, upon which is placed a revolving fitting (B), graduated to degrees, by which means the microscope can be turned round without its being lifted from the table, and the amount of such rotation registered; upon this fitting two pillars are firmly fixed, and between them the limb (C) can be elevated or depressed to any angle, and tightened in its position by the lever (D). The limb carries at one end the body (E) (Binocular or Monocular), with Eye- pieces and Object-glasses; in its centre the Compound Stage (F), beneath which is the circular plate, sliding on a dove-tailed fitting, and moved up and down by the lever (Z), and carrying the supplementary body or Sub-stage (G); and at the lower end a triangular bar carrying the Mirror (H). Each of these parts requires a separate description. The Binocular body consists of two tubes, the one fitted in the optical axis of the Micro- scope, and the other oblique. At their lower end, and immediately above the object-glass, there is an opening, into which a small brass box or fitting (I) slides; this box holds a prism so constructed that when slid in it intercepts half the rays from the object-glass, diverts them from their direct course, and reflects them into the additional or oblique tube. To the prism-box is attached a spring-catch, which, when pressed in, permits of the removal of the prism-box; but this is only needed for cleaning, as, when the box is drawn back to the distance allowed by this spring, the prism in no way interferes with the field of view, and all the rays pass up the direct body, and the Microscope is converted into a Monocular one. The upper or eyepiece ends of the tubes are fitted with racks and pinion for varying the distances between the two eyepieces, to suit the differences between the eyes of various persons; and arrangements are made for racking out one tube more than the other, to suit irregularities or inequalities between the eyes of the observer. This body is moved up and down with a quick movement by means of the milled heads (K), and with a very delicate and fine adjustment by the milled head (L). This milled head works against a lever, which moves a slide independent of the rack-movement, and gives an adjustment at once certain and decided. The Compound Stage is of an entirely new construction; the object is most frequently merely placed upon it, but, if necessary, it can be clamped by carefully bringing down the spring-piece (M); the ledge will slide up or down, and the object may be pushed sideways; this arrangement forms the coarse adjustment. Finer movements in vertical and horizontal directions are effected by means of two milled heads (N and 0), the screws attached to which are kept up to their work by opposing springs, so as to avoid all strain or loss of time. The whole stage revolves in a circular ring by the milled head (P), or this can be drawn out, and then it turns rapidly by merely applying the fingers to the two ivory studs (Q, Q) fastened on the top plate, which is divided into degrees to register the amount of revolution. The Stage is attached to the limb on a pivot, and can be rotated by any angle, which angle is recorded on the divided plate (R), or can be turned completely over, so that the object can be viewed by light of any obliquity without any interference from the thickness of the stage. Beneath and attached to the stage is an iris diaphragm (S), which can be altogether removed, as shown in the Illustration, from its dove-tailed fitting, so as not to interfere during the rotation of the stage. The variations in the aperture of this diaphragm are made by a pinion working into a racked arc and adjusted by the milled head (T). ti BENJ. PIKE'y SON X- CO., NEW YORK. Beneath the stage are two triangular bars (U, V), the one revolving round and the other rigid in the optical axis of the instrument. On the former the sub-stage (G), carrying all the apparatus hereafter described for illumination and polarization, fits, and is racked up ami down by the milled head (\Y); the mirror also, if desired, slides on the same bar; the revolving motion to this bar is given by the milled head (X), and the amount of angular movement is recorded on the circle (Y), whilst the whole of this part of the stand is raised and lowered concentric with the optical axis of the instrument by the lever (Z), and the amount of such elevation or depression registered on a scale attached to the limb. This bar can be carried round and above the stage, and be thus used for opaque illumination. The lower triangle bar (V) carries the mirror II, or a right-angle prism, when the illumina- tion is required to be concentric with the optical axis of the instrument, and independent of the movements of other illuminating apparatus. The mirror-box contains two mirrors, one flat and the other concave; it swings in a rotating semicircle attached to a lengthening bar, which enables it to be turned from one side to the other, and revolves on a circular fitting for giving greater facilities in regulating the direction of the beam of light reflected, the whole sliding on either of the triangle bars, previously referred to, and made to reverse in the socket (a) so as to bring the centre of the mirror concentric with the axis of the Microscope in either case. As the mirror alone is insufficient for many kinds of illumination, some provision has to be made for holding various pieces of apparatus between the object and the mirror. For this purpose a supplementary body, or sub-stage, is mounted perfectly true with the body, and is moved up and down in its fitting by rack and pinion connected with the milled heads (W). This sub-stage, to which reference has already been made, is now regarded as one of the most important parts of the Achromatic Microscope; in it all the varied appliances for modifying the character and direction of the light are fitted. But a few years since it was considered sufficient for this part of the stand to be constructed so as to move up and down perfectly coincident with the optical axis of the instrument, and for that purpose it was racked in a groove planed out on the same limb as that on the upper end of which the optical portions were carried. But lately microscopists have shown the desirability of affording every facility for lateral angular adjustments; and this has led to the sub-stage being attached to an arc (b) working in the circular plate (Y), and moved by a rack and pinion (X), whilst the amount of such angular movement is recorded on the upper surface of the plate (Y). Having once fixed the angular direction of the light, the focusing of it depends upon the lever (Z), which moves the circle up and down, and with it the arm carrying the illuminating apparatus, in the optical axis of the instrument. So long ago as 1854 Mr. Grubb, of DubliD, called attention to the advantage of mounting the illuminating apparatus on a revolving arm or arc, which he thus describes in his provisional specification for improve- ments iu Microscopes, No. 1477, 5th July, 1854:—"My third improvement consists in the addition of a graduated sectorial arc to microscope concentric to the plane of the object ' in situ,' on which either the aforesaid prism or other suitable illuminator is made to slide, thereby producing every'kind of illumination required for microscopic examination, and also the means of registering or applying any definite angle of illumination at pleasure." With but slight modification, this is the plan adopted in this Stand. The sub-stage is also fitted with complete centring and rotating adjustments, the latter having a graduated circle attached, and fittings for carrying Darker's Series of Selenites, Blue Glass disks for modifying the light, etc. In all the requirements of an instrument of precision, and fully meeting the wants of the most advanced modern workers, it is confi- dently believed that this new Stand has no rival. BENJ. PIKE'S SON & CO., NEW YORK. . 7 PRICE $750. No. 1. The Grand International Binocular Microscope, packed in a hand- some Mahogany Case, and having the following accessories, all of which are of the finest quality and of the highest perfection of workmanship : 5 Object-glasses, magnifying from 30 to 1,300 linear:—\\ in. (23°), f in. (32°), ■& in. (55°), £ in. (100°), I in. (120°). Lieberkuhns to the f in. and T\ in. Object-glasses. 6 Eyepieces, viz. :—1 pair A, 1 pair B, 1 pair C. Graduated Draw-Tube. Erecting-Glass for use with the | Object-Glass for erecting the Image and varying the power. Achromatic Condenser, with Revolving Diaphragm. Wenham's Parabolic Reflector. Polarizing Appa- ratus. One Selenite. Large Bull's-eye Condenser, on separate Stand. Smaller Side Con- denser. Parabolic Illuminator. Three Dark Wells and Holder. Double Nosepiece. Wol- laston's Camera Lucida. Eyepiece Micrometer. Stage Micrometer. Wenham's Compres- sor. Large Live-Box. Small Live-Box. Large Glass Trough. Two Glass Plates, with Ledges and Covers. Set of three Glass Fishing Tubes. Maltwood's Finder. Mineral Holder. Stage Forceps. Brass Pliers, etc. PRICE $500. No. 2. The Grand International Binocular Microscope, packed in a hand- some Mahogany Case, and having the following accessories, all of which are of the finest quality and of the highest perfection of workmanship : 3 Object-glasses, magnifying from 30 to 700 linear:—1| in. (23d), f in. (32°), | in. (100°). Lieberkuhn to the f Object-Glass. 6 Eyepieces, viz.: 1 pair A, 1 pair B, 1 pair C. Graduated Draw-Tube. Erecting-Glass, to be used with the f Object-Glass for erecting Image and varying the power. Achromatic Condenser. Polarizing Apparatus. One Selenite. One large Bull's-eye Condenser, on sep- arate Stand. One small Side Condenser. Parabolic Illuminator. Three Dark Wells and Holder. Large Live-Box. Two Glass Plates, with Ledges and Covers. Stage Forceps, Brass Pliers, etc. PRICE $400. No. 3. The Grand International Binocular Microscope. Packed in a handsome Mahogany Case, and having the following accessories, all of which are of the finest quality and of the highest perfec- tion of workmanship : 2 Object-glasses, magnifying from 60 to 400 linear:—f in. (32°), \ in. (100°). 4 Eyepieces, viz.: 1 pair A, 1 pair B. Graduated Draw-Tube. Large Bull's-eye Con- denser, on Separate Stand. Live-Box. Polarizing Apparatus. Two Glass Plates with Ledge and Covers. Stage Forceps, Brass Pliers, etc. PRICE $325. No. 4 The Grand International Binocular Microscope Stand. Packed in a handsome Mahogany Case, with Drawers for ho/ding accessory Apparatus. Brass handle, Lock and Key, and having 6 Eyepieces, viz.:—1 pair A, 1 pair B, 1 pair C. Glas* Plate with Ledge. Stage For- ceps, Pliers, etc. 8 BENJ. PIKE'S SON &r CO., NEW YORK. No. 5. The Large First-Class Binocular Microscope Stand, with Concen- tric Rotating Stage, Iris Diaphragm, Rotating and Centering Sub- Stage. Two pairs of Eyepieces. Forceps, Pliers, etc. Packed in a handsomely polished Mahogany Case,............§25h BENJ. PIKE'S SON & CO., NEW YORK. 9 PRICE $400. No. 6. The Large First-Class Binocular Microscope, with Concentric Ro- tating Stage, Centering and Rotating Sub-Stage and Iris Dia- phragm. Packed in a handsomely polished Mahogany Case, and having the following accessories, all of which are of the finest quality, and of the highest perfection of workmanship : 3 Object-glasses, magnifying from 30 to 700 linear:—1| in. (23°), f in. (32°), ^ in. (100°.) Lieberkuhn to f Object-glass. 6 Eyepieces, viz.: 1 pair A, 1 pair B. 1 pair C. Graduated Draw-tube. Erecting-Glass for use with f Object-glass for erecting the Image and varying the power. Polarizing Ap- paratus. One Selenite. Large Bull's-eye Condenser on separate Stand. Parabolic Illumin- ator. Three Dark Wells and Holder. Large Live-Box. Two Glass Plates with Ledges and Covers. Stage Forceps, Pliers, etc. PRICE $350. No. 7. The Large First-Class Binocular Microscope, with Concentric Ro- tating Stage, Centering and Rotating Sub-Stage and Iris Dia- phragm. Packed in a handsomely polished Mahogany Case, and having the following accessories, all of which are of the finest quality and of the highest perfection of workmanship : 2 Object-glasses, magnifying from 60 to 720 linear:—| in. (32°), ^ in. (100°). Lieberkuhn to f Object-glass. 6 Eyepieces, viz.: 1 pair A, 1 pair B, 1 pair C. Graduated Draw-Tube. Erecting-Glass for use with f Object-glass, for erecting Image and varying'the power. Bull's-eye Condenser on separate Stand. Three Dark Wells and Holder. Polarizing Apparatus. Live-Box. Glass Plates with Ledge. Stage Forceps, Pliers, etc. PRICE $300. No 8. The Large First-Class Binocular Microscope, with Concentric Ro- tating Stage, Centering and Rotating Sub-Stage and Iris Dia- phragm. Packed in a handsomely polished Mahogany Case, with the following accessories: 4 Eyepieces, viz. : 1 pair A, I pair B. § in. and \ in. Fine Achromatic Objectives. Po- larizing Apparatus. Bull's-eye Condenser, on separate Stand. Live-Box, Stage Forceps, Pliers, etc. PRICE $300. No. 9. The Large First-Class Monocular Microscope, with Concentric Rotating Stage, Centering and Rotating Sub-Stage, Iris Dia- phragm, and three Eyepieces. Packed in same kind of Case, and having the same accessories as No. 7. PRICE $250. No. 10. The Large First-Class Monocular Microscope, with Concentric Rotating Stage, Centering and Rotating Sub-Stage, Iris Diaphragm, etc. Packed in a handsomely polished Mahogany Case, with the following accessories : 3 Eyepieces, f in. and \ in. Fine Achromatic Objectives. Polarizing Apparatus. Bull's- eye Condenser, on separate Stand. Live-Box, Stage Forceps, Pliers, etc. PRICE $200. No. n. The Large First-Class Monocular Microscope Stand, with Con- centric Rotating Stage, Centering and Rotating Sub-Stage, Iris Diaphragm. Packed in a handsome Mahogany Case. 3 Eyepieces, Stage Forceps, Pliers, etc. 10 BENJ. PIKE'S SON & CO., NEW YORK. No. 12. The First-Class Library Binocular Microscope Stand, with Con- centric Rotating Stage and Centering Sub-Stage, Diaphragm. 2 pairs of Eyepieces, Forceps, Pliers, etc. In handsome Mahogany Case..........$175 BENJ. PIKE'S SON & CO., NEW YORK. 11 PRICE $300. No. 13. The First-Class Library Binocular Microscope, with Concentric Rotating Stage and Centering Sub-Stage. 2 Object-glasses, magnifying from 60 to 720 linear:—£ in. (32°), £ in. (100°). Lieberkuhn to the £ inch Object-glass. 6 Eyepieces, viz.: 1 pair A, 1 pair B, 1 pair C. Graduated Draw-tube. Erecting-Glass, for use with the § inch Object-glass, for erecting the image and varying the power. Polar- izing Apparatus. Bull's-eye Condenser. Three Dark Wells and Holder. Wenham's Parabolic Illuminator." Live-Box. Two Glass Plates, with ledges and covers. [Stage Forceps, Pliers, etc. Packed in a handsomely polished Mahogany Case. PRICE $250. No. 14. The First-Class Library Binocular Microscope, with Concentric Rotating Stage and Centering Sub-Stage. Packed in a hand- somely polished Mahogany Case, with the following accessories : 2 Object-glasses, magnifying from 60 to 720 linear:—f in. (32°), \ in. (100°). Lieberkuhn to the § inch Object-Glass. 2 pairs of Eyepieces, viz.: 1 pair A, 1 pair B. Graduated Draw^tube. Bull's-eye Con- denser, on stand. Live-Box. Stage Forceps. Glass Plate, with Ledge. Pliers, etc. PRICE $200. No. 15. The First-Class Library Binocular Microscope, with Concentric Rotating Stage and Centering Sub-Stage. Packed in a hand- somely polished Mahogany Case, with the following accessories: 2 pairs Eyepieces, viz.: 1 pair A, 1 pair B. f inch and ^ inch Achromatic Object-glasses of fine quality. Polarizing Apparatus. Bull's-eye Condenser, on separate Stand. Glass Plate, with ledge. Stage Forceps, Pliers, etc. PRICE $200. No. 16. The First-Class Library Monocular Microscope, with Concentric Rotating Stage and Centering Sub-Stage. Packed in a hand- somely polished Mahogany Case, with the following, accessories: 3 Eyepieces: l£ inch, f inch, and i inch fine Achromatic Object-glasses. Polarizing Ap- paratus. Bull's-eye Condenser, on Stand. Live-Box. Glass Plate, with Ledge. Stage For- ceps, Pliers, etc. PRICE $150. No. 17. The First-Class Library Monocular Microscope, with Concentric Rotating Stage and Centering Sub-Stage. Packed in a hand- somely polished Mahogany Case, with the following accessories : 3 Eyepieces: 1^ inch, § inch, and £ inch fine Achromatic Object-glasses. Bull's-eye Con- denser, on Stand. Live-Box. Glass Plate, with Ledge. Stage Forceps, Pliers, etc. PRICE $125. No. 18. The First-Class Library Monocular Microscope Stand, with Con- centric Rotating Stage and Centering Sub-Stage. Packed in a handsomely polished Mahogany Case. With 3 Eyepieces. Pliers, Stage Forceps, etc. 12 BENJ. PIKE'S SON & CO., NEW YORK. OBJECT-GLASSES FOR FIRST-CLASS MICROSCOPE STANDS. R. & J. BECK'S FINEST OBJECT-GLASSES. No. Focal Length. 25 4 inches 26 3 inches 27 2 inches 28 iyz inches 29 % inch 30 A inch 31 ■& inch 32 \i inch 33 $ inch 34 J inch 35 % inch 36 ^inch imme 37 fo inch 38 Scinch ^, inch Linear magnifying power nearly, with Eyepieces. Draw-tube closed........... 10 16 Ditto, if drawn out, add for each inch......... 1J 3 Draw-tube closed........... 12 20 Ditto, if drawn out, add for each inch......... 2 4 Draw-tube closed........... 20 38 Ditto, if drawn out, add for each inch......... | 4 6 Draw-tube closed........... 30 56 Ditto, if drawn out, add for each inch........ 5 7 Draw-tube closed........... 70 120 Ditto, if drawn out, add for each inch......... , 8 14 Draw-tube closed........... , 120 210 Ditto, if drawn out, add ' for each inch......... I 14 24 Draw-tube closed........... 146 255 Ditto, if drawn out, add for each inch......... 18 32 Draw-tube closed......... 200 340 Ditto, if drawn out, add for each inch......... 24 42 Draw-tube closed........... 225 400 Ditto, if drawn out, add for each inch......... 18 i 35 Draw-tube closed.......... 225 400 Ditto, if drawn out, add for each inch......... 18 35 Draw-tube closed........... 400 680 Ditto, if drawn out, add for each inch......... 50 85 Draw-tube closed........... 500 870 Ditto, if drawn out, add for each inch......... 60 100 Draw-tube closed........... 900 1570 Ditto, if drawn out, add for each inch........ 80 150 Draw-tube closed ........ 900 1570 Ditto, if drawn out, add for each inch........ 80 150 Draw-tube closed.......... 1800 3140 Ditto, if drawn out, add i for each inch......... 160 360 12 220 25 370 34 460 48 590 60 700 80 860 60 i 80 1180 ' 1440 140 ' 180 1500 , 1850 180 | 190 2750 3450 300 ! 350 2750 ' 3450 300 350 5500 ! 6900 32 52 6 48 8 74 85 10 130 12 120 15 190 15 270 22 410 27 460 48 710 46 5C0 70 890 60 720 80 1120 85 860 120 1450 Angle of aperture, about. 130 1450 130 2240 280 2800 370 4950 900 4950 900 9900 600 : 700 1800 23 32 55 90 75 120 160 140 170 140 Price. $15 00 27 50 27 50 27 50 25 00 40 00 60 00 40 00 40 00 50 00 65 00 50 00 120 00 110 00 150 00 LIEBERKUHNS FOR OBJECT-GLASSES. No. Object- glass. Price. No. Object- glass. 40 3-inch, $5 75 41 2-inch, j 5 75 42 43 H-inch, f-inch, Price. No. Object- glass. Price. $5 75 44 TVinch, $4 00 4 25 45 J-inch, 4 00 BENJ. PIKE'S SON & CO., NEW YORK. 13 No. 50. 4 51. 3 52. H 53. 2 3 54. 4 55. A 56. i 57 A 58. 1 59. A 60. 61. 65. n 66. 2 3 67. 1 68. TT7 70. 3 71. H 72. t 73. * 74. 1 WM. WALE'S FIRST-CLASS OBJECTIVES. inch Objective, Angle of Aperture, 9°, " " " 12°, " " " 23°, " " " " " 32°, " H (i II U )7g° " " " " " 95°, " " " 100°, " " " " 135°, " 170°, immersion, " " " 170°, Oil Immersion Lenses made to order. WM. WALE'S PROFESSIONAL OBJECTIVES. inch Professional Objective, Angle of Aperture, 23°, " " " " " " 30°; " " " " " . " 100°, " » " 135°, WM. WALE'S ECONOMIC OBJECTIVES. inch Economic Objective, Angle of Aperture, 9°, 12°, 20°, 45°, 75°, " 120°, Price. $15 00 17 00 17 00 18 00 30 00 35 00 30 00 35 00 40 00 45 00 65 00 100 00 15 00 15 00 20 00 25 00 7 00 6 00 6 00 10 00 12 00 20 00 BECK'S NATIONAL ACHROMATIC OBJECTIVES. (Of moderate price, but of excellent quality.) In order to meet the universal demand for good and well directed Object-glasses, adapted to the wants of true observers, who need reliable glasses at a moderate cost, impossible in lenses of the very highest grade, we have now introduced our New National Series, which we confidently recommend as the best low-priced Objectives ever made. They are corrected with great care, are exceedingly well mounted, furnished with the Society Screw, and packed in handsome engraved Brass Boxes. The Series is as follows: Focal Lineal magnifying power nearly, Degrees of - No. length. with Eyepieces. angle of aperture. Price. Draw-tubes. A. B. C. 80. 3 in. closed 12 20 32 7° $6 00 81. 2 in. closed 23 43 70 10° 6 00 82. . lin. closed 47 78 116 19° 8 00 83. fin. closed 65 110 170 25° 10 00 84. £in. closed 100 170 260 38° 10 00 85. iin. closed 200 340 520 75° 12 00 86. iin. closed 365 620 965 . 95° 20 00 * 87. n in- closed 730 1240 1930 110° 30 00 14 BENJ. PIKE'S SON & CO., NEW YORK. FIRST-CLASS ACCESSORIES. No. 90. Sorby's Spectroscope Eyepiece, for the Microscope, in Mahogany Case, 91. Sorby's Dichroiscope,...... 92. Sorby's Standard Spectrum-scale, .... 93. Orthoscopic Eyepieces, giving a very large field, each, 94. Eyepieces, each,....... 95. Erecting-glasses,....... 96. Draw-tubes for First-Class Microscopes, . 97. Achromatic Condenser, with Revolving Diaphragm, with stops, Aperture from 25° to 80°, complete adjustments, applicable to the First-Class Stands only, 98. Achromatic Condenser, without Diaphragm, Aperture from 20° to 60°, complete Adjustments,....... 99. Brass Work of Achromatic Condenser, . 100. Right-angle Prism, for reflecting the light more perfectly than the Flat Mirror, for the First-Class Stands only,...... 101. Amici's Prism, for oblique light, for the First-Class Stands only, 102. Amici's Prism, on Separate Stand,...... 103. Nachet's Prism, for oblique light,...... 104. Wenham's Parabolic Reflector, for the First-Class Stands, 105. Spot Lens, mounted in brass fitting, ..... 106. Equilateral Prism on Stand, for oblique illumination, 107. Adapter on Stand, for use of Object-glass as Condenser, 108. Brown's Iris Diaphragm,....... 109. Polarizing Apparatus, with 1 Film of Selenite, 110. Polarizing Apparatus, with extra large Polarizing Prism, 111. Darker's Series of Selenites, adapted for the First-Class Stands only, 112. Selenite Film, of two colors,...... 113. Selenite Stage, Red and Green or Blue and Orange, each, 114. Darker's Selenite Stage, giving 13 tints, 115. Black Glass, for Polarizing Light.....• . 116. Bundle of Glass, for Polarizing Light, .... 117. Two Double-Image Prisms and Selenite Film, with fittings to Eyepiece, and brass plate with holes...... 118. Single Double-Image Prisms, in fitting, . 119. Crystals to show rings round the Optic Axis, each from 120. Tourmalines, each :...... 121. Beck's Patent Illuminator, in a brass box, for viewing Objects as Opaque under high powers,....... 122. White-cloud Illuminator,..... 123. Parabolic Illuminator, fitted to the 1^-inch and f-inch Object-glasses, 124. Parabolic Illuminator, with fittings adjusting it to any Object-glass, 125. Parabolic Illuminator, same as No. 124, with the addition of Sorby's Reflector. 126. Large Bull's-eye Condensing Lens, on Stand,...... 127. Large Bull's-eye Condensing Lens, on Stand, with Lamp attached, . 128. Smaller Condensing Lens, with Fitting to Limb of the First-Class Stands, 129. Smaller Condensing Lens, on Stand,....... 130. Side Silver Reflector, with Fittings to Limb of the First-Class Stands, . 131. Side Silver Reflector, on Stand,........ Price. $45 00 S 00 8 00 8 00 6 00 $5 00 and 8 00 4 00 40 00 20 00 8 00 20 00 16 00 16 00 8 00 13 00 4 00 8 00 4 50 16 00 20 00 32 00 30 00 and 2 00 3 00 16 00 4 00 8 00 16 00 7 00 4 00 4 00 8 00 10 00 16 00 8 00 10 00 7 00 5 00 8 00 8 00 BENJ. PIKE'S SON & CO., NEW YORK. 15 No. 134 135 136 FIRST-CLASS ACCESSORIES, Pri $4 CE. 00 5 00 13 00 23 00 8 00 4 00 4 00 6 00 5 00 3 00 Amplifier for increasing the power of any Objective,..... Three Dark Wells and Holder,......... Opaque-Disk Revolver, one Tray of Disks in case,...... 137. Opaque-Disk Revolver, with 3 trays of Disks, Forceps, Capsule of Gold Size, in Mahogany Case, complete,......... 138. Opaque-Disk Revolver and Forceps,........ 139. Boxes containing 24 Disks,.......... 140. Trays containing 24 Disks,.......... 141. Three-pronged Forceps, in German Silver, with Screw Adjustment, 142. Three-pronged Forceps,........... 143. Stage Forceps..........$2 00 and 144. Stage Mineral-Holder,...... 145. Eyepiece Micrometer, with Jackson's Adjusting Screw 146. Stage Micrometer, mounted in brass, 147. Stage Micrometer, mounted in card, 148. Maltwood's Finder in case, 149. Indicator to each Eyepiece, 150. Leeson's Goniometer, .... 151. Wollaston's Camera Lucida, with lens to magnify Pencil Point, 152. Neutral-tint Glass Camera Lucida, . 153. Steel-Disk Camera Lucida, .... 154. Brook's Double Nosepiece, in Aluminium, curved, 155. Brook's Double Nosepiece, curved, . 156. Quadruple Nosepiece,..... 157. Quadruple Nosepiece, in Aluminium, 158. Lever Compressorium, ..... 159. Parallel Compressor, ..... 160. Reversible Compressor, .... 161. Wenham's Compressorium, for use with Wenham's Parabola, 162. Best Live Box, with Screw Cover, . 163. Large Live Box, " " " . . 164. Smaller " " " " " . . 165. Large Glass Trough, with Wedge and Spring complete, . 166. Smaller Glass Trough, " " " . 167. Glass Slip, with Ledge, ...... 168. Growing Cell, for preserving objects alive in water for many 169. Set of Six Live Traps and Trough, in case complete, 170. Live Trap, . . ' . 171. Frog Plate, with Bag, etc., complete, 172. Glass Slip, with Hollow and Ledge, 173. Glass Slip, with Hollow and Ledge and Lip, 174. Glass Tubes, Set of Three, . 175. Key for Tightening Joint of First Class Instruments, 176. Opal Glass, for Moderatiug the Light, 3x1 inch, 177. Blue Glass, for Moderating the Light, 3x1 inch, 178. Astral Oil Lamp, Flat Wick and Shade, with arrangement for varying height of flame above the table, 179. Case for Lamp, and 1 chimney, 180. Gas Lamp, Argand Burner, Shade and six feet of flexible tubing, with ar rangements for varying height of flame above the table, 181. Fiddian's Microscope Illuminator, in case, 182. Brass Student Lamp, ....... Any piece of apparatus in the foregoing list can be applied to the first class Stands of all makers, American or English, and the prices will be found much loioer than those of any other first-class manufacturer. 16 BENJ. PIKE'S SON &r CO., NEW YORK. DESCRIPTION OF THE PHYSICIAN'S BINOCULAR MIOROSOOPE. The Microscope Stand, No. 190, which is about 15 inches in height, and made entirely of brass, is finished throughout in the highest degree of workmanship, and is supported on a firm and substantial tripod base. From the centre of this base rises a stout column, to the top of which is attached, by a firm joint, the arm carrying the binocular tubes or body, by which the inclination can be varied to any degree from vertical to horizontal, the whole in- strument being perfectly steady, and free from tremor in any position. TJie very highest powers may be used with it, as the body, being supported by the arm throughout its entire length, cannot have any unsteadiness or motion of its own. The coarse adjustment of focus is effected by means of rack and pinion, with large milled heads, which works so smoothly, that there is no need to use the fine adjustment for any power lower than J^ of an inch. The fine adjustment is by means of a delicate micrometer screw and lever attachment, working with absolute freedom from all motion, and by which the very highest powers may be focused with the greatest exactness. The stage is of glass, with a complete rotation in the optic axis, upon the top of which is a sliding object holder, very thin, and with a spring clip for holding the object in place during rotation. Beneath the stage is a tube for attaching such sub-stage apparatus as the Acromatic Con- denser, Wenham's Parabola, Polarizing Apparatus, etc., etc. This is securely fastened to the stage by a bayonet catch, and can be instantly detached, leaving a very thin and unobstructed stage for Oblique Illumination. The Shutter Diaphragm, which accompanies it, is of novel construction, with the various sized openings almost in contact with the under side of the object under examination—a great improvement upon the old revolving Disk Diaphragm. A Double Mirror Concave and Plane is hung upon a swinging bar, and arranged with every possible motion for Direct and Oblique Illumination. As a whole, it is a complete and elegantly finished Microscope, perfect in every part, and cannot fail to give entire satisfaction in every particular, as it is undoubtedly the choicest and cheapest Binocular Microscope for the price that has ever been offered to the public. 190. The Physician's Binocular Microscope......$100 00 With 2 pairs of Eyepieces; 1 inch and \£ inch fine Achromatic Object- glasses, magnifying from about 50 to 500 diameters; Bulls-eye Condenser on separate stand; Glass Plate, with Ledge, Stage Forceps, Pliers, etc. Packed in a handsomely polished Mahogany case, with brass handle, and drawers for accessories. 191. The Physician's Binocular Microscope...... With 2 pairs of Eyepieces; 1 inch and 34 iQCn nne Achromatic Object- glasses, magnifying from about 50 to 500 diameters ; Polarizing Apparatus; Live-Box; Bull's-eye Condenser on separate Stand ; Glass Plate, with Ledge; Stage Forceps, Pliers, etc. Packed in a handsome Mahogany case, with drawers for accessories. 192. The Physician's Binocular Microscope Stand..... With 2 pairs of Eyepieces; Concave and Plane Mirrors; Diaphragm; Stage Forceps; Glass Plate, with Ledge. Pliers, etc., in Mahogany case, with drawers for accessories. BENJ. PIKE'S SON & CO., NEW YORK. 17 190. THE PHYSICIAN'S BINOCULAR MIOROSOOPE. PRICE $100. With 2 pairs of Eyepieces, 1 inch and % inch fine Achromatic Object Glasses, magni- fying from about 50 to 500 diameters. Bull's-eye Condenser on separate stand; packed in a handsomely polished mahogany case, with drawers for accessories, pliers, forceps, etc. 2 67 18 BENJ. PIKE'S SON &• CO., NEW YORK. DESCRIPTION OF THE POPULAR BINOCULAR MICROSCOPE. No. 195. The Stand, which is about 15 inches in height, and made entirely of brass, is finished throughout in the finest manner. It is supported on a substantial tripod base, which renders the instrument very firm and steady, so that the highest powers may be used without the least tremor. Rising above the base there is a solid pillar, on the top of which is a joint, by moans of which the body of the instrument may be placed at any angle from vertical to horizontal. The coarse adjustment is by means of a rack and pinion, accurately fitted, which gives a very smooth motion when focusing, and the finer adjustment with a micrometer screw, which moves the entire body of the instrument with the greatest delicacy and precision. The Binocular body has attached to it an adjustment for the width of the eyes, and the Prism at the lower end can be pushed aside and the instrument used as a Monocular. It is provided with a Glass Stage, which can be moved freely in any direction, Plane and Concave Mirrors, so arranged that the greatest obliquity of light^may be obtained. Dia- phragm, Stage Forceps, etc. PRICE $80. THE POPULAR BINOCULAR MICROSCOPE.. With 2 pairs of Eyepieces. 1 inch and 34 inch fine Achromatic Object-glasses. able Glass Stage, Pliers, Stage Forceps, etc. Packed in a handsome Mahogany case. PRICE LIST OF OBJECT-GLASSES. Mov- Linear Mag nifying Power, nearly, Degrees of No. Focal Length. Angle of with Eyepieces. Aperture. Draw-Tube, A. B. C. 196. 2 inches ll Closed, Open, 15 26' 20 34 34 57 \ - $6 00 197. 1 inch r Closed, Open, 48 68 63 93 105 155 \ "• 7 00 198. i inch i Closed, Open, 76 110 100 145 170 240 I 36° 9 00 199. i inch \ Closed, Open, 150 215 200 290 340 480 j- 70° 10 00 200. | inch !| Closed, Open, 290 410 390 560 660 900 I 85° 17 50 201. ^inch 1 Closed, Open. 660 925 900 1260 1500 2100 i 100° 35 00 ADDITIONAL ACCESSORIES. No. 202. Lieberkuhn to 1 inch Object-Glass, 203. Dark Well,...... 204. Achromatic Condenser and fitting, .... 205. Wenham's Parabolic Reflector, for dark field illumination 206. Polarizing Apparatus, with Selenite, 207. Wollaston's Camera Lucida, for drawing an object, . 208. Glass Micrometer, ruled into y^g- and -j-^ of an inch, 209. Live-Box,........ 210. Glass Trough, complete with wedge and spring, 211. Eyepiece Micrometer,...... 212. All of the above "Additional Apparatus"—202 to 211—when ordered to- gether, will be furnished for..........40 Prick. $3 00 2 00 8 00 8 00 13 50 5 00 2 00 2 00 2 50 2 50 00 BENJ. PIKE'S SON & CO., NEW YORK. 195. THE POPULAR BINOCULAR MIOROSOOPE. PRICE $80. 20 BENJ. PIKE'S SON & CO., NEW YORK. 215. THE PHYSICIAN'S MIOROSOOPE. 03 BENJ. PIKE'S SON & CO., NEW YORK. 21 DESCRIPTION OF THE PHYSICIAN'S MIOROSOOPE. The Stand, No. 215, which is about 16 inches in height, is constructed entirely of brass, of the highest finish and finest workmanship, having a substantial tripod base, from the centre of which rises a solid pillar, to the top of which is attached, by a firm joint, the arm and body of the instrument, which can be placed at any degree of inclination from vertical to horizontal. The whole instrument being perfectly steady and free from tremor in any position, the very highest powers can be used with it, as the body being supported by the arm throughout its entire length, cannot have any unsteadiness or motion of its own. The Mechanical Stage, which, by means of Rack and Pinion, with large Milled Heads, gives a delicate vertical and horizontal motion, and also a complete rotation in the Optic Axis, has upon the top a sliding object holder for holding the object in place during rotation. The Coarse Adjustment of focus is effected by means of Rack and Pinion and large Milled Heads, which work so smoothly that there is no need of using the Fine Adjustment for any power lower than 34 oi an inch. The Fine Adjustment is, by means of a delicate microm- eter screw and lever attachment, working with absolute freedom from all motion, and by which the very highest power can be focused with the greatest degree of accuracy. PRICE $100. No. 215. The Physician's Microscope, with Mechanical Stage, giving a Verti- cal, Horizontal, and Rotary Motion. 3 Eyepieces; finch and ^ inch fine Achromatic Object-glasses; Bull's-eye Condenser on separate stand; Glass Plate; Stage Forceps; Pliers; Live-Box, etc. Packed in a handsomely polished Mahogany Case, with drawers for accessories. PRICE $80. 216. The Physician's Microscope, with Movable Glass Stage. 2 Eyepieces; | inch and £ inch fine Achromatic Object-glasses; Bull's-eye Condenser on separate stand; Glass Plate ; Stage Forceps; Pliers; Live-Box, etc. Packed in a handsomely polished Mahogany Case, with drawers for accessories. PRICE $95. 217. The Physician's Microscope, with Movable Glass Stage. 2 Eyepieces; | inch and £ inch fine Achromatic Object-glasses; Bull's-eye Condenser on separate stand; Polarizing Apparatus; Stage Forceps; Live-Box; Glass Plate; Pliers, etc. Packed in a handsomely polished Mahogany Case, with drawers for accessories. PRICE $60. 218. The Physician's Microscope Stand, with Movable Glass Stage. Packed in a handsomely polished Mahogany Case, with 2 Eyepieces, Stage Forceps, Glass Plate, Pliers, etc. 22 BENJ. PIKE'S SON & CO., NEW YORK. 220. THE PROFESSIONAL MICROSCOPE. PRICE $50. 94 BENJ. PIKE'S SON & CO., NEW YORK. 23 THE PROFESSIONAL MICROSCOPE. Among the many Microscopes which we offer, few have met with the rapid sale, and high approval of Students and Scientific men, as that which we familiarly term our Fifty DoUar Professional Microscope, Fig. 220. As little can be done at the present time in the line of medical or scientific research with- out the use of a Microscope, it is incumbent on the manufacturer of such instruments to produce a Microscope of such excellent optical qualities and superior workmanship, and at such a moderate price, as to meet the wants of the Student, and to be to him practically of as much value as an instrument of far greater cost. Our Fifty Dollar Professional Microscope is especially adapted to meet this demand, and from careful observation we are convinced that, considering the superior workmanship of the instrument itself and the excellence of the Achromatic Objectives which are furnished with it, it stands unequalled. The Professional Microscope when in use with the draw-tube closed is 15 inches high, and firmly and substantially made of highly-finished brass. The body of the Microscope is supported on two columns by a joint, so that it may be inclined to any angle. The Coarse Adjustment is by means of a Rack and Pinion, accurately made and fitted, which gives a very smooth and even motion when focusing, and the fine adjustment by a Micrometer Screw, which moves the entire body of the instrument vertically with the great- est delicacy and precision, so that objectives of the highest power may be used with it. It has a Glass Stage which can be moved horizontally in any direction ; also a revolving Diaphragm, Plane and Concave Mirrors, and a 6 inch Draw-Tube. PRICE $50. No. 220. The Professional Microscope, with Iron Base, packed in a hand- somely polished Mahogany Case, with two Eyepieces, % inch and \ inch fine Achro- matic Objectives, magnifying from 75 to over 800 diameters, with Bull's-eye Condenser on separate stand, Forceps, etc. PRICE $60. No. 221. The Professional Microscope, with Brass Base, packed in a hand- somely polished Mahogany Case, with two Eyepieces, % inch and \ inch fine Achro- matic Object-glasses, magnifying from 75 to over 800 diameters, Bull's-eye Condenser on separate stand, Forceps, etc. PRICE $45. No. 222. The Professional Microscope, with Iron Base, packed in a hand- somely polished Mahogany Case with one Eyepiece, % and J inch, fine Achromatic Object-glasses, magnifying from 75 to over 800 diameters, Forceps, etc. PRICE $70. 223. The Professional Microscope, with Iron Base, packed in a handsomely polished Mahogany Case, with two Eyepieces, f inch, £ inch and ^ inch fine Achromatic Object-glasses, magnifying from 75 to over 1500 diameters, Bull's-eye Condenser on separate stand, Forceps, Pliers, etc. PRICE $35. 224. The Professional Microscope Stand, with Iron Base, packed in a hand- some Mahogany Case, with two Eyepieces, Forceps, Pliers, etc. 24 BENJ. PIKE'S SON & CO., NEW YORK. THE EDUCATIONAL MICROSCOPE. 225. No. Price. 225. The Achromatic Educational Microscope......$20 00 This is a thoroughly well-made instrument of highly finished Brass, and is furnished with two Eyepieces, the Lenses of which are accurately ground and centered, and which, in con- nection with the 3^ inch Achromatic Combination Objective which accompanies it, form a Microscope of great value for Botanical, Geological and other scientific observations. The instrument is about 12 inches in height, heavy, firm and substantial in all its parts, so that a higher power Objective can be used with it when necessary. The Coarse Adjustment by means of Rack and Pinion is smooth and steady in its action, and the body of the instrument can be inclined for convenience in use. Attached to the body is a Condensing Lens for use in the illumination of opaque objects, and its Magnifying Mirror can be moved in any direction. The Achromatic Objective which belongs to it can be taken apart, and either of its three Lenses used separately or together, thus varying its power from about 50 to 300 diameters. It is packed in a handsomely polished Walnut Case, with Brass Forceps, Glass Slips, etc. 226. The Educational Microscope.........$15 00 This is the same instrument as No. 225, having two Eyepieces, the same kind of Walnut box, etc., but the Objectives of which are non-achromatia It gives, however, excellent definitions. 227. The Smaller Educational Microscope.......$1000 Is an instrument of the same character as No. 226, but of a smaller size, and magnifies about two-thirds as much. It is provided with an Eyepiece, a triple Objective, which can be taken apart and used separately; a Box, Glass Slips, etc. BENJ. PIKE'S SON & CO., NEW YORK. 25 THE BEGINNER'S MICROSCOPE. No. 230. The Beginner's Microscope This instrument, which is about six inches in height, and made of brass, well finished and highly polished, is wonderfully well adapted to give the be- ginner an endless amount of pleasure and instruction in magnifying and trans- forming into almost inconceivable beauty the common objects to be found in the country, such as flowers, insects, minerals, sea-weed and animalcula from the ponds, etc. It has a magnifying power of about 40 diameters (1,600 times), and is packed in a neat Walnut Case, having a pair of Pliers, two Glass Slips, for holding an object between, one Excavated Glass Slip, for holding a drop of vinegar or stagnant water for observation, also one Prepared Object. 231. The Beginner's Microscope.........$5 oo Having three Object-glasses magnifying respectively 40, 60 and 80 diame- ters (or 1,600, 3,600 and 6,400 times), and also a Condensing Lens for opaque objects, in Walnut Case, with Glass Slips, Pliers, Object, etc. 232. Prepared Objects for the Beginner's Microscope, . . . per dozen. 1 25 Price. $2 50 26 BENJ. PIKE'S SON & CO., NEW YORK. THE MODEL DISSECTING MIOROSOOPE. 236. 235. No. Prick. 235. The Model Dissecting Microscope.......$15 oo Stand all brass, with broad circular Base and large firm Stage; Jointed Arm to carry the Lenses, with rack-and-pinion adjustment of focus; Con- cave Mirror and Side Condensing Lens with complete adjustments ; two single Lenses of 13^ and 1 inch focus, a Glass Plate to fit the opening in the Stage, two Dissecting Needles and a pair of brass Forceps; the whole packed in a strong Mahogany Case with handle and lock. The Model Dissecting Microscope. Stand only with one Lens; no Case or Condenser............10 00- This instrument has been specially designed to meet a long-felt want for a thoroughly good dissecting Microscope, at a very moderate cost. The Stand is very firm, with a roomy Stage of the exact height from table for convenient use; the Lenses are exceedingly good, and of the most useful powers, and the whole will be found very satisfactory for most purposes. ACCESSORIES FOR DISSECTING MICROSCOPES. 237. Coddington Lens, 1 inch focus, 238. " " ^ inch focus, 239. " " % inch focus, 240. Holder for Glass Slips, . 241. Two Brass Saucers with Glass Bottoms, 242. Two Flat Glasses, .... 243. Two Concave Glasses, 244. One Piece of Box-wood covered with Cork, 245. One Gutta-Percha Tray loaded with Lead, 246. One Piece of Lead and Cork, 247. One Pair of Steel Forceps, 248. Two Pairs of Scissors, . 249. One Needle Holder, 250. Two Knives, . 251. Two Hooks, . 252. Two Points, . 253. Wooden Tray for holding Dissecting Instruments, 254. Box for containing additional Apparatus, $6 00 6 00 6 00 2 00 2 50 85 2 00 65 85 65 1 25 3 50 2 00 2 00 1 75 1 75 2 75 2 75 BENJ. PIKE'S SON & CO., NEW YORK. 27 EXCELSIOR POCKET AND DISSECTING MICROSCOPE. The construction and method of using this Microscope are very simple, and will be readily understood from an inspection of the engraving. It consists primarily of a small wooden case, about one-third larger than shown in engraving. To one end of the lid of this case is attached one of the ends of the box ; and when the lid is reversed and turned upside down it may be slid into the groove of the case, and then forms a stand for the lenses and glass stage, as is shown in the cut. The lenses and stage are supported by a steel rod, D, the lower end of which is hinged to the lid so that it may be turned down and lie in a groove provided for it. When raised into the position shown in the figure, it is held very securely in place by means of the button, E; and this button also serves to retain it in the groove when it is turned down. The glass stage, G, when it is fitted into a frame of hard rubber, slides easily on the stem, D, so as to be readily adjustable for focus, while at the same time it may be firmly fixed by means of a set-screw, at any desired height, and will then serve as a stage for dissecting purposes. The frame which holds the lenses fits on to the top of the stem. A mirror, H, is fitted into the case, and is readily adjustable, by means of the button shown on the outside, so that light may be reflected up through the stage when the objects to be examined are transparent, and when they are to be viewed by reflected light there is a dark ground of hard rubber, N, which is also carried by the stem, D, and may be turned under the stage, so as to cut off all transmitted light. Dissecting needles (K and L), with neat handles, fit into appropriate grooves. As a dissecting microscope for botanical, entomological, and physiological work, this instrument is very efficient and convenient. The glass plate is fitted into the stage so as to form a cell capable of holding water, so that dissection may be carried on under that liquid, or aquatic animals may be kept alive and examined at leisure. The stage may also be turned so that the flat side will be up when so desired. When the lenses and stage are removed, they are readily packed in the case, which can be carried in the vest pocket. The lenses may be used either singly or together; are well made, and are provided with a proper diaphragm, which secures distinctness or definition. They give a range of power of from live to thirty diameters (twenty-five to nine hundred times the surface), the first being admirably adapted to the examination of minerals, textile fabrics, the larger parts of flowers, insects, etc., while the latter is sufficiently powerful to enable the student to dissect flowers, and examine their more minute structure with great efficacy. 255. With two lenses,...... . . . . $2 50 256. With three lenses,............2 75 257. Set of three hard rubber slides, with openings of different kinds to serve as linen provers,............25 28 BENJ. PIKE'S SON & CO., NEW YORK. MICROTOME, OR SECTION CUTTER. No. Price. 258. Section Cutter (Mr. Walmsley's adaptation of Dr. Bevan Lewis's Ether Spray Microtome). Complete with Atomizer,......$20 00 This instrument, now largely in use by our leading Histologists, and by the Medical Department of the Army, is confidently recommended as the most complete and perfect Microtome yet produced. To the excellent Section Instrument of the Army Medical Museum pattern, No. 282, a second table, with glass top, is added, through which a brass-topped tube, with Condensing Chamber beneath, is advanced by the same Micrometer screw. Some thickened gum-water being put upon the top of this tube, a piece of tissue, say a portion of spinal column from a freshly-killed animal, may be placed in it, and the nozzle of the freezing Atomizer having been introduced into the tube beneath, the tissue will be solidly frozen in from one to three minutes. Ether may be used, but Rhigolene is much better (we can supply it, if desired); a considerable portion of it will be condensed in the chamber, and can be drawn off by the tube, shown in the illustration, for further use. The Knife should be kept cold by being placed on a block of ice before using. Full directions for use accompany each instrument. If the purchaser already has a freezing Atomizer, the Microtome may be purchased without it for $16.00. This Microtome, as well as 282, is made in two sizes, with tubes of 1 inch and 14, inches diameter. In ordering please state which size is desired. BENJ. PIKE'S SON & CO., NEW YORK. 29 DISSECTING INSTRUMENTS AND MATERIALS FOR MOUNTING. 265-266. 264. 272-274. 275. No. 260. 261. 262. 263. 264. 265. 266. 267. 268. 269. 270. 271. 272. 273. 274. 275. 276. 277. 278. 279. 280. 281. 282. 284. 285. 287. 288. Forceps, brass, 3 inches long,..... " Quekett's, for taking objects out of deep bottles, " Bull-nose, ....... " Steel Nickel-plated, straight, 4 inches long, " " " curved, 4 " " " " " 4 " very delicate, " " " straight, 4 " " " Scissors for dissecting, straight blades, very delicate, " " blades curved on the flat, " " elbow blades, .... " " " " very strong, " with spring, exceedingly delicate, Needle-holder, for Dissecting Needles, .... " for dissecting, straight point, ebony handle, " " " book " " " . . Knives, " " each,...... Valentine's Knife, for cutting thin sections of soft substances Razor, with flat side, for cutting sections, Knife, for use with section cutters, in Morocco case, Knife, for use with section cutters, heavy blade, in Morocco case, Dr. Seller's Section-Knife and Carrier, adapted to any Microtome. By use of this the largest and thinnest sections, absolutely even in thickness, may be cut, Section Cutter, Dr. Ranvier's pattern, with glass top, and binding screw, for holding wood and other hard substances,....... Section Cutter, Army Medical Museum pattern, with glass top, and clamp for fastening to table,........ . . . Section Cutter (Rutherford's Microtome), Army Medical Museum pattern, large size, with ice-box for freezing,......... Section Cutter, pattern of M. Rivet, in wood, with knife, . . . . Spring Compressors, nickel-plated, per doz.,....... " " wood, per doz., . ....... Price. $0 25 2 50 1 00 1 00 1 00 1 50 1 50 1 50 1 50 1 50 1 25 6 00 75 15 15 75 6 00 1 50 3 50 5 00 13 00 7 50 10 00 15 00 7 50 60 25 30 BENJ. PIKE'S SON cV CO., NEW YORK. INSTRUMENTS AND MATERIALS FOR MOUNTING. 290. No. Price. 290. Injecting Syringe, of brass, finest quality, 3>£-oz. capacity, with four pipes and stop-cock, in fine Morocco case,........$9 00 291. Injecting Syringe, the same as 290, of 1-oz. capacity, . . . . . 10 00 292. " " " " 2-oz. " '.....12 00 293. Turn-Table, with Walmsley's Centering adjustment,.....4 00 294. Turn-Table, Shadbolt's,...........3 00 295. " Sidle's " Congress," self-centering, ... ... 7 00 296. " Cox's improved self-centering, for all Slides, . . . . 6 50 297. " Beck's "New Volute" self-centering, for all Slides, . . . 7 00 This Table, of almost precisely the size and appearance of 296, is a modifica- tion of both Cox's and Bulloch's, and is confidently recommended as the most perfect yet produced. 298. Brass Table, with folding legs and lamp, for mounting with balsam, . . 2 50 299. Brass Table and lamp, small size,.........1 50 GLASS SLIPS, COVERS, ETC. 300. Flatted Crown Glass Slips, Chance's'Best, 3x1 inch, cut edges, per dozen, 15 cents, per gross,............ 1 50 301. Flatted Crown Glass Slips, Chance's Best, 3x1 inch, smoothed edges, per dozen, 30 cents, per gross, ........ 3 00 302. Plate Glass Slips, Chance's Patent, 3x1 inch, cut edges, per dozen, 30 cents, per gross,.............3 00 303. Plate Glass Slips, Chance's Patent, 3x1 inch, smoothed edges, per dozen, 40 cents, per gross,............4 50 304. Plate Glass Slips, Chance's Patent, 3x1 inch, extra thin, smoothed edges, per dozen, 50 cents, per gross,..........5 00 305. Wooden Slips, 3x1 inch, with hole in center, used in mounting objects between thin glass, or opaque, per dozen,........ 20 306. Glass Slips, with Hollow, 3x1 inch, smooth edges, per dozen, . . . . 1 60 307. Glass Slips, 3x1 inch, smooth edges, with cells of various sizes, shapes and depths, attached by marine glue, ready for use, per dozen, . . . . 2 50 303. Glass Cells, of various sizes, shapes and depths, per dozen, . . . . ] 00 309. Block-Tin Cells, of various sizes and depths, for fluid and balsam mountings, per dozen.............. 50 310. Hard-Rubber Cells, of various sizes and depths, for dry and opaque mount- ings, per dozen,............ 15 311. Thin Glass, in sheets, No. 3, •g'p-to T^ per oz........ 75 312. " " " " No. 2, jlv to-T$ff per oz.,......100 313. " " " " No. 1, T£TT to tj^, or thinner, per oz., . 1 50 314. " " " squares, No. 3, per dozen, 18 oents, " 1 25 315. " " " " No. 2, " 20 " "... 2 25 316. " " " " No. 1, 25 " "... 2 75 317. " " " circles, No. 3, per dozen, 20 cents, per oz., 2 25 318. " " " " No. 2, " 25 " " .... 2 75 319. " " " " No. 1, " 30 " " .... 3 75 BENJ. PIKE'S SON & CO., NEW YORK. 31 320. No. 320. Small Air Pump and Receiver, for use in mounting, 321. Holman's Life Slide, with cover, in box, . 322. Holman's Current Slide, with cover, in box, 323. Holman's Syphon Slide, with cover, in box, Price. $10 00 1 50 1 50 4 00 276. 276. Valentine's Double Bladed Knife, for cutting sections, $6 00 279. 279. Knife, for cutting sections, with extra heavy blade, in Morocco case, $5 00 296. 296. Improved Self-Centering Turn Table, for all slides, $6 50 985�581878780808086858�545�25948�8349957 32 BENJ. PIKE'S SON & CO., NEW YORK. LIQUIDS AND CEMENTS FOR MOUNTING. 362. 325. 339. No. 325. 326. 327. 328. 329. 330. 331. 332. 333. 334. 335. 336. 337. 338. 339. 340. 341. 342. 343. 344. 345. 346. 347. 348. 349. 350. 351. 352. 353. 354. 355. 356. 357. 358. 359. 360. 361. 362. Canada Balsam, pure, in collapsible tubes..... " " " in chloroform, requires no heat, per bottle, " " " in benzole, " " " Damar, . Glycerine, pure, Glycerine, Camphorated, for mounting Jelly, . Deane's Medium, Farrant's Medium, . Absolute Alcohol, . Benzole, pure, Brunswick Black, Asphalt, . Gold-Size, Marine Blue, . Oil of Cloves, . Bell's Cement, White Zinc Cement, Punches, various sizes, 34 inch to 1 inch, Instrument for cutting circles of thin glass, in Glaziers' Diamonds, from, Writing Diamonds, each, Watch Glasses, all sizes, each 7 cents, per dozen, Dipping and Dropping Tubes, each, Pippets, with bulb, . Ammonia Carmine, . Borax "... Carmine Red, .... Dr. Woodward's Violet Carmine, Methyl Aniline, Green, . Magenta " Red, Blue " ... Eosin,..... Osmic Acid, -^ oz., in glass capsule, Picro Carmine, .... Sulphindigotate of Soda (Dr. Seller's), Carmine Injecting, Gelatine (Dr. Seiler's Capped Bottles for containing fluids for mounting, each, per Price. 50 50 50 25 25 50 35 60 25 25 25 25 25 35 50 50 50 each, 50 to 1 25 10 00 00 to 8 00 3 50 75 10 25 25 25 25 25 25 25 25 25 2 50 25 25 1 00 50 bottle, per bottle, per oz., BENJ. PIKE'S SON & CO., NEW YORK. CONDENSING LENSES ON STANDS. 33 No. 363. 364. Price. 363. Condensing Lens (Bull's-eye), \% inch diameter, on Brass stand, with joint adjustment,........• • • $3 50 364. Condensing Lens (Bull's-eye), 3 inch diameter, on high Brass stand, . 7 00 365. 365. Double Nosepiece, angular, $6 00 345. Glaziers' Diamonds, each, from 346. Writing " " $4 00 to $8 00 3 50 34 BENJ. PIKE'S SON &■ CO., NEW YORK. ELEGANT CABINET FOR MICROSCOPIC OBJECTS. One-Fourth Actual Size. 06 �29209�777 BENJ. PIKE'S SON & CO., NEW YORK. 35 ELEGANT CABINETS FOR MICROSCOPIC OBJECTS. No. Price. 380. Mahogany Cabinet to hold 600 objects, with double glass doors and improved slide-rests, showing each object clearly when the drawers are pulled out, and allowing their easy removal,........$45 00 381. Best Spanish Mahogany Cabinet, with glass panel and deep drawers at bottom, to hold 1000 objects,.........68 00 382. Honduras Mahogany Cabinet, without glass panel or deep drawers, to hold 1000 objects,...........50 00 383. Best Spanish Mahogany Cabinet, with glass panel, to hold 750 objects, . 47 00 384. Honduras Mahogany Cabinet, without glass panel, to hold 750 objects, . 40 00 385. Best Spanish Mahogany Cabinet, with glass panel, to hold 500 objects, . 36 00 386. Honduras Mahogany Cabinet, without glass panel, to hold 500 objects, . 30 00 In the above Cabinets there are porcelain tablets let into the fronts of the drawers. The drawers are numbered and the specimens lie flat. CASES FOR MICROSCOPIC OBJECTS. 390. 390. Portable Horizontal Slide Cabinet, in Mahogany, with 12 Trays, to hold 12 doz. objects,............$7 50 391. Portable Horizontal Slide Cabinet, in Mahogany, with 12 Trays, to hold 6 doz. objects, . ..........5 00 392. Portable Horizontal Slide Cabinet, in Mahogany, with 6 Trays, to hold 3 doz. objects,............3 00 393. Portable Horizontal Slide Cabinet, in Poplar, with 4 Trays, to hold 2 doz. objects,.............2 00 394. Quarto Book Cabinet, for 144 objects, fitted with Elastic Bands to keep the objects in position,...........10 00 395. Card-Board Boxes, fitted with Racks, to hold 12 objects, 396. Postal Boxes, to take 1 object,........ 397. " " " 3 "........ 398. " " 6 "........ 399. " " " 12 ".....- • 400. " " 25 "....•:.. LABELS AND COVERS FOR MICROSCOPIC OBJECTS. 401. Adhesive Labels, Plain White, Round or Oval, . . per box, 402. " Assorted Colors, Square, neatly bordered, 15 6 8 10 12 15 403. " Fronts for covering slides, handsome gold design, 404. " " for covering slides, handsome bronze design, 405. Backs for covering slides,...... 406. Backs or Fronts, if with holes punched, extra, 100, 100, 100, 100, 100, 10 25 50 30 10 15 36 BENJ. PIKE'S SON & CO., NEW YORK. TOURMALINE POLARISCOPE WITH CRYSTALS. i1/. /. 1 V'iV'i"., Cv-\ W\ A. 410. B. The Tourmaline Polariscope consists of two plates of Tourmaline mounted in Cells and held opposite each other in a spring frame. By placing a crystal between, and revolving the Tourmalines in their axes, beautifully colored rings, such as Figs. A and B, are distinctly seen. No. 410. Tourmaline Polariscope, ...... 411. " " with Crystal, NIOOL'S PRISMS. 412. Nicol's Prism of Iceland Spar, 8 millimetres across face, 413. 414. 415. 416. 417. 418. 419. 9 10 11 12 14 16 20 Price. S5 00 6 00 2 25 2 75 3 50 4 00 4 75 6 75 9 75 20 00 425. 425. Solid Flint Glass Prism, 6 inches long, on stand, 426. " " 7 " " 427. " " 8 " " FRENCH ACHROMATIC OBJECTIVES. 430. Achromatic Objective, No. 0, 1-inch, doublet, 431. " " ;1 1, % " triplet, 432. " " " 2, % " 433. " " " 3, I " 434. " " " 4, ye " 435. " " " 5, f0- " 436. " ' " " 6, TV " 2 50 3 00 3 50 2 50 3 00 3 50 4 00 5 00 7 10 00 00 BENJ. PIKE'S SON & CO., NEW YORK. 37 A CLASSIFIED LIST OF FIRST-CLASS MICROSCOPIC OBJECTS, Including the Best Preparations of American and Foreign Artists. It is not intended in the limited extent of this list to enumerate even a small portion of the immense number of preparations in every department of Science with which our Cabinets are filled, but merely to call attention to the leading ones in each. It is our aim. to furnish., if gossibje, any slide that may be ordered, and if not in stock, we shall spare no pains to obtain it. Any number of preparations will be sent to any address (with satisfactory references) for examination, securely packed, but at the risk and cost of the party to whom sent. This is a great convenience to those residing at a distance, who cannot conveniently visit our rooms for selection. Prices have been - materially reduced from former rates, and it will always be our en- deavor to furnish the most perfect preparations at the lowest rates. Our Popular and House- hold Series of objects are most excellent and varied in character, and remarkably cheap (in price only), since their quality is very good. The Messrs. Cole & Son's Anatomical and Diatom preparations are uniformly the best that have thus far been produced, and they will hereafter supply us with their best work as heretofore. Dr. Schaeffer, of Washington, and Dr. Seiler, of Philadelphia, will also supply us with their unsurpassed Histological and Pathological Specimens. Our Double Stained Vegetable preparations (Mr. Walmsley's) are attracting marked attention at home and abroad. The following notice of the Messrs. Cole speaks for itself: (From the British Medical Journal, Oct. 30, 1875.) We have just had an opportunity of inspecting a series of microscopic slides prepared by Arthur C. Cole & Son, of Liverpool. These slides illustrated both healthy and morbid tissues, and the sections brought out well the different structures, and were chosen from good speci- mens. As to the mounting, it was all that could be desired, and the sections, in size and amount of surface, exceed anything we have hitherto seen. The staining is done by a process peculiar to Messrs. Cole, and is far superior to any in use elsewhere. Taken altogether, they are the most perfect and beautiful things of the kind ever offered for public sale. This is not only our own opinion, but that of some of the most expert microscopists of the day, who have testified to the excellence of these slides. For teachers wishing illus- trations for their class-teaching, they will be found very acceptable, while to students com- mencing their histological researches, they will be invaluable, not only for their demonstrating power, but as models to be aimed at as the students themselves become experts in the art. 38 BENJ. PIKE'S SON & CO., NEW YORK. ANATOMICAL PREPARATIONS. By ARTHUR 0. COLE & SON. Series No. 1. 24 Pathological Preparations, from the Human Subject. 1. Lung, in Phthisis. 13. Kidney, Cirrhosis, showing intertubular 2. " Catarrhal Pneumonia. fibroid growth. 3. " Croupous " i 14. Kidney, Contracted constitutional Syphilis. 4. Liver, Amyloid, not universal in lobules. 15- Spleen, Amyloid (or Sago). 5. " Cancer. 6. " Cirrhosis, universal in lobules. 7. " Fatty, not " " 8. " Indurated. 9. " Syphilitic, showing fibrous bands at margin. 16. Stomach, Cancer. 17. Hypertrophied Lymphatic Gland from Neck. 18. Schirrus Mammas, round Cells elongating into Spindle Cells. 19. Uterus, Fibroid Tumor, showing Spindle Cells. 10. Kidney, Scarlet Fever, Desquamative Ne- 20. Epithelioma of Lip. phritis. 21. " " Hand. 11. " advanced Bright's disease; tubes 22. " " Vulva. and vessels much distended. 23. Malignant Tumor from Neck. 12. " Fatty degeneration. 24. Vascular Tumor of Perinseum, In case with trays. Objects lie flat,.........$16 00 Series No. 2. 24 Physiological Preparations.' 1. Man Tongue, Transverse Section. 13. Cat, Ileum, Transverse Section. 2. ii Ileum, " " 14. " Lung. 3. ii Kidney, injected from Artery only. 15. " Brain, Cerebrum. 4. " Kidney, from Artery and Vein. 16. " Tongue, Transverse Section. 5. n Skin, Vertical Section. 17. " Liver, two colors. 6. u Brain, Cerebellum. 18. " Bladder, Transverse Section. 7. k " Cerebrum. 19. Dog, Stomach of Puppy. 8. u Stomach. 20. Pig, Parotid Gland. 9. u Pancreas. 21. Rabbit, Colon, mucous membrane. 10. u Placenta. 22. " Ileum, mucous membrane. 11. u Cuticle, showing hair follicles. 23. " Kidney, from Artery and Vein. 12. " Thyroid Gland. 24. " Tongue, Transverse Section. In case with trays. Objects lie flat, . ....... $16 00 Series No. 3. 24 Educational Preparations. 1. Adipose tissue. 2. Connective tissue. 3. Yellow elastic tissue. 4. Striped muscular fibre. 5. Unstriped " " 6. Tendon, Long Section. 7. " Transverse Section. 8. Yellow Elastic Cartilage of Cow's Ear. 9. Hyaline Costal Cartilage. 10. Bone, Long Section. 11. " Transverse Section. 12. " Skull, Transverse Section. In case with trays. Objects lie flat, . 13. Scalp, showing hair. 14. Nerve Fibres. 15. " Cells. 16. Skin, Vertical Section. 17. Tooth, " " 18. Capillaries in Pia-Mater. 19. Pigment Cells. Lung of Cat Injected. Liver " » Brain " " Kidney of Rabbit. Ileum. $16 00 BENJ. PIKE'S SON & CO., NEW YORK. 39 Series No. 4. 48 Physiological Preparations (to supplement Series 2). Division 1.—24 from the Human Subject. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. Human Medulla oblongata, T. Sect. Pons Varolii, Spinal Cord, L. Sect. T. Sect. Pituitary Body, Liver, stained. Lung, " Kidney, " Spleen, " Heart, " Lung of still-born infant, jected. Supra-renal Capsule, T. S. In- 13. Human Lymph. Gland, T. S., Stnd. 14. " Mammary Gland, T. S., Stnd. 15. " Prostate " " " 16. " Testicle, Adult " " 17. " Ovary Gland, " " 18. " Penis of Infant, " Inject. 19. " Uterus, Adult, " Stnd. 20. " Umbilical Cord, " " 21. " Scrotum, V. S. 22. " Larynx of Infant, T. S., Injected. 23. " Eyelid of Infant, V. S., Injected. 24. " Pancreas, T. S., Stained. Division 2.—24 from the Lower Animals. 25. Cat—Spinal Cord, T. S., Stained. 26. " Medulla, " " 27. " Oesophagus, " Injected. 28. " Pad of Foot, V. S., " 29. 11 Bladder, T. S., " 30. " Testicle, " " 31. " Ovary, " " 32. " Adipose Tissue, " 33. '' Muscular " " 34. Monkey—Penis, T. S., Stained. 35. " Testicle, " " 36. Rat—Ileum, " " 37. " Stomach, T. S., Injected. 38. Rat—Brain, T. S., Injected. 39. " Kidney, " " 40. Fowl—Kidney, " 41. " Lung, " " 42. " Glandular Stomach, T. S., In- jected. 43. Snake—Liver, T. S., Stained. 44. " Lung, " " 45. " Kidney, " " 46. Dog—Tongue, " Injected. 47. Starhng—Glandular Stomach, T. S., Stained. 48. " Gizzard, Stained, T. S. Series No. 5. 24 Preparations to illustrate the Anatomy of the Frog (Rana Temporaria). 14. Brain, Stained, Trans. Sect. 15. Spinal Cord, " " 16. Testicle, " " 17. Heart, " " 18. Web of Foot, Injected. 19. Skin. 20. Skin, Stained, Vert. Sect. 21. Femur, Trans. Sect. 22. Femur, Long Sect., showing articular cartilage. 23. Ovary with Ova. (Bladder.) 24. Oviduct, Trans. Sect. 1. Lung, Injected, Trans. Sect. 2. Liver, " 3. " Stained, 4. Kidney, Injected, 5. " Stained, 6. Tongue, " 7. Stomach, " 8. Colon, " 9. Ileum, " 10. Spleen, " 11. Voluntary muscular fibre 12. Involuntary 13. Nerve fibres. Series No. 6. 24 (Surgical) Pathological Preparations from the Human Subject. 1. Granulations in healing ulcer. 2. Inflamed Skin. 3. Inflamed subcutaneous tissue. 4. Chronic inflammation of an Artery (Athe- roma). 5. Thickening of a Cerebral Artery in Syphi- lis with thrombosis. 6. Syphilitic Gumma, chronic inflammatory growth. 7. Syphilitic Chancre. 8. Noevus (or Cavernous Tumor) of Scalp. 9. Enlargement of a Lymphatic Gland. 10. Simple Lymphadenoma. 40 BENJ. PIKE'S SON & CO., NEW YORK. 11. Cancer of Breast. 12. Cancer of Ovary. 13. Cancer of Prostate Gland. 14. Epithelioma of Lip. 15. Adenoid Tumor of Breast. 16. Cystic Enlargement of Thyroid body (Bronchocele). 17. Fibroid Tumor of Uterus. Series No. 6.—Continued. Round-celled Sarcoma of Hand 1 . 19. Alveolar " Scapula. 20. Spindle-celled " Uterus. 21. Enchondroma of Bone. 22. Myeloid Sarcoma of Bone. 23. Mvxoma. 24. Inflamed Kidney after Stricture. MEDICAL PATHOLOGY. Lung—Miliary Tubercle. Croupous Pneumonia. Acute Bronchitis. Syphilitic Phthisis. Phthisis. Tubercular Pneumonia. Tubercle. Pneumonia. Pleurisy. Emphysema. Empyema. Pyaemic Tuberculosis. Carcinoma. Catarrhal Pneumonia. Hemorrhagic " Embolic " Round-celled Sarcoma. Melanosarcoma. Smothered Child. Saw Grinder's. Liver—Nutmeg. Fatty Degeneration. Amyloid " Peculiar Fat in Lobules. Caruinoma. Cirrhosis. Indurated with Atrophy of Lobules. Cancer and Cirrhosis. Syphilitic. Abscess. Red Atrophy. Parenchymatous Inflammation. Amyloid and Fatty Degeneration. Cirrhotic with Vascular Tumor. Pylorus—Carcinoma. Stomach—Chronic Catarrh. Passive Congestion. Thickening. Colon—Acute Inflammation. Mucous Polypus. Ileum—Tubercle. Amyloid Degeneration. Inflammation. Enteritis. Ulceration. Typhoid Ulceration. Spleen—Inflammation. Tubercle. Enlarged in Chronic Heart Disease. Spleen—Amyloid (or Sago). Calcareous Cicatrix. Embolism. Leuccemia. Pancreas—Carcinoma. Kidney—Suppuration. Fatty. Scarlet Fever. Cirrhosis. Hypertrophied. Amyloid. Bright's Disease. " " Acute. Indurated. Post Scarlatinal Dropsy. Dropsy. Tubercle. Cirrhotic and Amyloid. Gouty or Red Degeneration. Pyronephritis. Acute interstitial Nephritis. Chronic " " Embolism. Atrophy. Medullary Cancer. Brain—Cerebrum Meningitis. " Acute Inflammation. Softening. General Paralysis. " Atrophy. Cerebellum, Locomotor Ataxia. Dura Mater, much thickened. Pons Variolii, General Paralysis. " " Diabetes. Medulla Oblongata Locomotor Ataxia. y in Diabetes. Myelitis. Locomotor. Ataxia, etc. the various Spinal Cord from Tetanus. Hydrophobia. Locomotor Ataxia. Degeneration of the Nerve Cells Fracture. General Paralysis. in Insanity. regions in BENJ. PIKE'S SON & CO., NEW YORK. 41 MEDICAL PATHOLOGY-Oontinued. Skin—Granulations in Healing Sores. " . of Ulcers. Hypertrophied. Pityriasis. Tattooed. Cancer. Scarlet Fever. Variola, Simple. Icthyosis. Variola, Hemorrhagic. Lupus Vulgaris. Small Pox, Simple. " Hemorrhagic. Glands—Carcinoma of Lymphatic. " Prostate. Supra-renal Carcinoma in Addison's Disease. Prostate enlarged. Glands—Hypertrophied from Neck. Arteries—Cerebral (Atheroma of). " organizing Thrombus in Syphilis. ' Chronic Thickening. Aortic Valve, ossified. Heart—Pericarditis. Fatty Degeneration. " Infiltration. Fibroid Degeneration. Various—Muscle, Fatty Infiltration. Diaphragm, Calcareous Nodule. Muscle, Farcy Tubercle. Uterus, Chronic Leucorrhcea. Pseudohypertrophic Muscular Par- alysis. Trichinous Muscle, etc. SURGICAL PATHOLOGY. Cancer of LjTmphatic Gland. '• Recurrent Fungoid of Breast. " Breast. " Prostate Gland. " Ovary. " Skin. " Brain (Encephaloid). " Jaw. " Face. Epithelioma of Vulva. " Lip. " Hand. " Tongue. " Foot. Penis. " Jaw. " Cheek. Leg. Sarcomas—Periosteal of Humerus. " Recurrent in Scalp. " Testicle (Roundcelled). " Retro Peritoneal. " of Hand (Roundcelled.) " " Femur. " " Lung. Alveolar of Scapula. Cystic of Testicle. Melanosarcoma of Lung. Osteosarcoma of Knee. Spindlecelled of Uterus. " Frontal Bone. " Mesentery. " Lymphatic Gland. Melanotic of Eyeball. Various—Inflamed Muscular Tissue in Hip Disease. Cystic Adenoma of Breast. Softened Knee Joint. Ulcer of Tongue. Bronchocele. Fibroid Degeneration of Testicle. Various—Enlarged Prostate Gland. Inflamed Skin. Indurated Testicle. Myeloid Tumor of Jaw. Bony " " Enlarged Tonsils. Skin Plastic Effusion from Foot after Inflammation. Papilloma of Thigh. Noevus from Occiput of Infant. Simple Lymphadenoma from Neck. Recurring Periosteal Tumor of Frontal Bone. Enchondroma of Parotid Region. Enlarged Strumous Gland from Neck. Chronic Inflammation of a Lym- phatic Gland. Chronic Cystitis of Bladder. Fibroid Cyst from Breast. " " Patella. " " Uterus. " " Hand. " " Jaw. Inflamed Muscle. Ulcer of Tongue. Chancre of Prepuce. Keloid Growth from Arm after Gunshot Wound. Elephantiasis of Neck. Soft Wart from Jaw. Hard Wart from Back. Submaxillary Lymphadenoma. Enchondroma of Clavicle. Cavernous Tumor of Tongue. Uterine Polypus. Gumma from Parietal Bone. Caries of Bone. Myxoma from Arm. " Ear. 412 BENJ. PIKE'S SON Ss CO., NEW YORK. PHYSIOLOGICAL PREPARATIONS. (Injected—Stained—and both Injected and Stained.) Brain—Human, Cerebellum. " Cerebrum. " Medulla oblongata. " Pons Variolii. Cat, Cerebrum. " Cerebellum. " Medulla oblongata. Monkey, Cerebellum. " Cerebrum. " Medulla oblongata. Spinal Cords—From various regions and trans, and long, sects.— Human. Cat. Horse, etc. Generative Organs, etc. Human, Penis, Infant. " Testicle, Adult. Child. Infant. " Uterus, Adult. " " Infant. " Ovary, Adult. Child. " Umbilical Cord. " Placenta. Cat, Testicle. " Ovary. " Bladder. Monkey, Penis. " Testicle. Rabbit, Penis. Rat, Penis. Tongue—Human, Adult and Child. Cat and Kitten. Rabbit. Rat. Puppy and Snake. Ileum—Human, Trans. Sect. Adult and Infant, Mucous Membrane. Rabbit, Mucous Membrane. Cat, " " Puppy, Colon—Rabbit, " " Cat, " " Kidney—Human, Adult and Child. Snake (Injected) from Artery only. Cat {from Artery only). Rabbit (from both Artery and Vein). Rat (from both Artery and Vein). Fowl (from both artery and Vein). Skin—Human and Cat. Cuticle—Human. | Stomach—Human. Cat. Fowl. Puppy. Glands, etc. Human, Thyroid. " Submaxillary. " Parotid. " Prostate. " Lymphatic. " Mammary. " " during Lac- tation. " Thymus. " Sublingual. Cat, Lymphatic. " Submaxillary. " Suprarenal. Lung—Human, Adult, Child and Foetal. Cat (Air Cells inflated). Fowl. Snake. Liver—Human. Cat, etc. Various Organs— Human, Larynx of Infant. Foetal. " Optic Nerve. " Nerves, various. " Scalp. " of Negro. " Pancreas. " Spleen. " Tendon. " Arteries. " Cartilages, various. " Bones, " " Tissues, " " Eyelid. " Nose. " Suprarenal Capsule, etc. Cat, CEsophagus. " Pad of Foot. " Olfactory Bulb. " Muscle. " Bladder. Sheep, Optic Nerve. Monkey, Bladder, etc. Dog, Tail of Puppy. " Foot of " Frog, Preparations of all the Organs either Injected or Stained. These preparations are all made expressly for us by the Messrs. Cole, and each one is specially selected. They are not the ordinary commercial slides, of which too many are sent to this country. Their price is exceedingly low for such preparations—75 cents each or $7.50 per dozen. ' BENJ. PIKE'S SON & CO., NEW YORK. 43 URINARY DEPOSITS 60 and 75 cents each. $ Typical Urinary Deposits. Uric Acid in normal and in rare forms. In Cirrhosis of Liver, Dysentery, Hepatic Ascites, Pneumonia, Gastric Fever, Hema- turia, Acute Rheumatism, Pericarditis, Pleuritis, Gout, Gastralgia, Dyspepsia, Scurvy, Rheumatic Gout, Rheumatic Fever, Rheumatic Endocarditis and Pericarditis, Congestion of Lungs, Gout and Eczema. Uric Acid from Boa-constrictor. Urea. Urate of Ammonia. Urate of Soda. Nitrate of Urea. Oxalate of Urea. Triple Phosphate Stellate and Rhombic. Also, in Hip-joint disease, Renal Calculus, Gen- eral Paralysis, Ulceration of Knee-joint, SELECTED 50 cents each. Achnanthea longipes. " subsessilis. Actinocyclus Ralfsii. Actinoptychus splendens. " undulatus. Amphiprora alata. Amphitetras antediluviana. Amphora laevis. Arachnoidiscus ornatus. Aulacodiscus Crux. Auliscus sculptus. Biddulphia laevis. " pulchella. " rhombus. Campylodiscus limbatus. " Echineis. " Clypeus, " spiralis. Climacosphenia moniligera. Ceratoneis Arcus. " lunaris. Cocconeis placentula. " Pediculus. " Scutellum. Cocconema Cistula. " lanceolatum. Colletonema vulgare. Coscinodiscus Oculus Iridis. " radiatus. Cyclotella Meneghiniana. Cylindrotheca gracilis. AND SPERMATOZOA. 6.00 to $7.50 per dozen. Catarrh of Bladder, Ramollisement of Brain, Endocarditis of Brain and of Acute Rheumatism, Hepatitis and Syphilitic Hep- atitis. Hippuric Acid, Typical form. Oxalate of Lime, Octohedral form. " " Dumb-bell form. Carbonate of Lime, from Man and Horse. Oxalurate of Ammonia. Murexide. Choles- terine. Sugar of Milk. Sugar in Diabetes, Cystine or Cystic Oxide. Spermatozoa from Man, Bird, Boar, Elephant, Fish, Mouse, Dog, Horse, Newt, Rat, Rab- bit, Hare, Rhinoceros, Ram, Goat, Camel, Deer, Wolf, Ass. DIATOMS. $5.00 per dozen. Cymatopleura Solea. Cymbella amphicephala. " affinis. " gastroides. " helvetica. " ventricosa. Diatoma elongatum. " vulgare. Endostaurum Cruzigerum. Epithemia constricta. " gibba. " Hyndmannii. " turgida. Eunotia undulata. Eupodiscus Argus. Fragilaria intermedia. " minima. " virescens. Gephyria media. Gomphonema acuminatum. " commune. " geminatum. " gracile. " robustum. " olivaceum. Grammonema striatulum. Homoeocladia Martiniana. Isthmia enervis. Licomphora Pappeana. Mastogloia Braunii. Melosira arenaria. 44 BENJ. PIKE'S SON & CO., NEW YORK. Melosira Borrerii. " crenulata. " nummuloides. " varians. Meridion circulare. " constrictum. Navicula Carassius. " Clepsydra. " didyma. " Entomon. " nobilis. " major. " gibba. " gibba forma gracilis. " mesolepta. " oblonga. " radiosa. " amphisbaena. " serians. " hemiptera. " slesvicensis. " sphaerophora. " splendida. Nitzschia amphioxys. " hungarica. " media. " obtusa. Nitzschia Schwcinfurthu. Odontidium hiemale. Odontodiscus subtillis. Pleurosigma acuminatum. Podosira maculata. Pyxidicula cruciata. Rhabdonema adriaticum. " arcuatum. Rhoicosphenia curvata. Schizonema Grevillei. Seoliopleura tumidum. Solium exculptum. Stauroneis gracilis. " lanceoltata. " Phoenicenteron. Stephanodiscus Niagarae. Surirella striatula. Synedra affinis. " familiaris. '' capitata. " pulchella. " tabulata. " splendens. Tabellaria fenestrata. " flocculosa. Terpsinoe musica. Triceratium membranaceum. Toxonidea insignis. With hundreds of others. Assortment constantly changing. TEST DIATOMS. Mounted Dry or in Balsam, as preferred. 75 cents each. $7.50 per dozen. Amphipleura pellucida. Cymatopleura elliptica. Fragilaria capucina. Frustulia saxonica. Navicula cuspidata. " rhomboides. Grammatophora marina. " subtillissima. Hyalodiscus subtilis. " Stelliger. Nitzschia sigmoidea. " obtusa var. scalpeliformis. Pleurosigma angulatum. " attenuatum. " acuminatum. " aestuarii. " balticum. " formosum forma gigantea. " Hippocampus. " Spencerii. Rhizosolenia styliformis. Striatella unipunctata. Surirella Gemma. Triceratium favus. MOLLER'S DIATOMAOEEN AND OTHER TYPEN PLATTES. No 437. Moller's Diatomaceen Typen Platte, No. 1, is a slide of the usual size—three inches by one inch—comprising about 500 Diatoms (correctly, 392 dis'tinct species and varieties), being acknowledged types of Seventeen Genera of the Order Diatomacese. The shells BENJ. PIKE'S SON & CO., NEW YORK. 45 are arranged in four quadrangles, each formed of six lines, and each line containing about sixteen species, presenting a figure of the following form: I. II. 1 ......................... 1 .......................... 2 .......................... 2 ......................... 3 ......................... 3 .......................... 4 ........................ 4 .......................... 5 .......................... 5 .......................... 6 .......................... 6 .......................... III. IV. 1 .......................... 1 .......................... '2 ..:.............;........ • 2......................... 3 .......................... 3 ......................... 4 ........................ 4 .......................... 5 .......................... 5 .......................... 6 .......................... 6 ......................... The Diatoms are prepared in the best manner, mounted in Balsam, absolutely pure and clean, while the integrity of each and the symmetry of the whole may be said to be as perfect as possible. Easy reference to each member is afforded by an accompanying Printed Catalogue, by which the name of any individual Diatom on the slide may be learned; or any name in the Catalogue as easily identified with its corresponding shell on the slide. The classification is that of Herrn A. Grunow, of Berndorf, near Wien. To the name of each Diatom, is appended its nature, whether fossil or recent; its origin, whether marine or from brackish or fresh water; its geographical locality, with the name of the naturalist who assigned its nomenclature. On the whole, it is a marvellous production of human skill and unceasing perseverance— a wondrous example of accurate manipulation and delicacy of touch, exciting the admiration of all who see it. To the Naturalist and Student, it forms a Cyclopaedia of reference, which may be long and repeatedly studied, with untiring interest and returning freshness. It is worthy of a place in the cabinet of every advanced Microscopist. Price, in morocco case, with bound Catalogue,.......$30 00 438. Moller's Diatomaceen Typen Platte, No. 2, is a smaller collection of One Hun- dred Diatoms, by the same artist,' arranged on the same plan in one quadrangle, accompanied by a printed Catalogue, and quite equal in quality to the larger collection. Price,.........1200 439. Moller's Diatomaceen Typen Platte, No. 3, is similar to, but has the name of each Diatom photographed beneath it, so that specimen and name can be seen at one view. Price,........... 13 50 440. Moller's Diatomaceen Probe Platte, is a collection of 20 Diatoms, by the same artist, arranged in a single line, on a slide of the usual size—3x1 inch—in Balsam, and graduated, according to their value as test objects. In a neat morocco leather case, with descriptive list. Price,.....6 00 441. Moller's Diatomaceen Probe Platte, the same as 440, but mounted dry. Price, .............7 50 442. Moller's Typen Platte of the Holothuridas, containing 34 species, mounted on a slide of usual size—3x1 inch. In morocco case, with descriptive Cata- logue. Price,........ ... 15 00 443. Moller's Typen Platte of the Echinoidea, on slide 3x1 inch. In morocco case, with Catalogue. Price,..........7 50 46 BENJ. PIKE'S SON & CO., NEW YORK. NOBERT'S BANDS OF TEST LINES. We receive direct from M. Nobert, of Pomerania, his exquisitely fine Bands of Lines. ruled on glass, as described in a communication to the American Xaluralist, April, 1S6S, reprinted in the Quarterly Journal of Microscopical Science, October, 1868, p. 131, and referred to in Dr. Carpenter's Microscope and its Revelations, fourth edition, London, 1868, p. 180. " The mathematical certainty with which the distance of these lines may be ascertained, and the regular gradation of the series they present, give to M. Nobert's Test .Plate a very high value for the determi.ifttioa of the relative merits of achromatic objectives—of that class, at least, in which angular aperture and definition are of the first importance."—Carpenter on the Microscope, fourth edition. Slide, 3x1 inches, in morocco case,..........$50 00 MISCELLANEOUS TEST OBJECTS. 60 and 75 cents each. !j Scales of Lepisma saccharina, Podura plum- bea. " Lepidocyrtus curvicollis, the Origi- nal by the late Richard Beck. " Greenhouse Degeeria, Templetonia nitida, Macrotoma major, Petro- bius maritimus. " Meadow Brown—Hipparchia janira. " White Cabbage (large) — Pontia brassica. Do. (small) — Pieris rapae. " Green Forester—Procris statices. " Azure Blue—Polyomatous argiolus. " Brazilian Blue—Morpho menelaus. 5.00 and $7.50 per dozen. Scales of Brazilian Ajnathusia Horsfieldii, Cloth-moth — Tinea, vestimenti, Gnat — Culex pipiens, dry. Wing of Gnat, in balsam and dry. Hair of Indian Bat, Australian ,Bat, Indian Mouse, Larva of Dermestes. Proboscis of Blow-fly, Pygidum of Flea. Ultimate Fibrous Tissue of Muscle of Pig (Powell's Test). $1.00. Disk of Deal (Dr. Carpenter's Test forjAchro- matism). Section of Spine of Echinus (Dr. Carp3nter's Test for Flatness of Field). $1.00. SECTIONS OF MINERALS, GOALS AND FOSSIL WOODS. 75 cents and $1.00 each. $7.50 to $10.00 per dozen. Minerals. Moss Agates, various. Basalt—Giant's Causeway, Fingal's Cave, Staffordshire. Carbonate of Lime. Stalactite. Flint, with various organic remains, Spicules, Sponges, Corals, Xanthidia (or Sporangio), and Shells. Granite from Aberdeen, Peterhead, Killarney, Ireland, Guernsey, "Greenland's Icy Mount- ains," Cornwall, Cheesewring, Greywacke from Labrador. Syenite from Mount Sorrel, Sarcophagus in Gt. Pyramid. Limestone, Nummulitic—foundation of the Great Egyptian Pyramid. Limestone, St. Vincent's Rock. Limestone, Magnesian, Dudley; Mountain, Scotland; Upper Silurian, Dudley; Oolitic, Clifton and Bath, Encrinital Marble, Foun- dation Stone of Old Blackfriars Bridge, Himalaya Mountains, Lyme Regis and Portland, Niagara Falls. Many of the above contain interesting organ- isms—Foraminifera, Echini, Shells, Coral, Spicules, Nummulites, etc., etc. Lapis lazuli. Lepidolite. Madrepores, various. Black Marble. Encrinital Marble, Derbyshire. Marble, Carrara, Temple of Ephesus. Green Malachite from Russia. Blue Malachite from Australia. New Red Sandstone, Cumberland. BENJ. PIKE'S SON & CO., NEW YORK. 47 Old Red Sandstone, Scotland. Pitch-stone, Isle of Arran. Red Porphyry, Egypt. Brown Porphyry, Sweden. Heliotrope, Blood-stone. Sun-stone. Serpentine, Red and Green. Water Cells in Quartz Rocks from Norway and Mont Blanc. Various Organisms from the Chalk, Chalk Marl and Gault. Cannel or Parrot Coal. Torbane Hill Coal. Sections of Jet (Whitby). Sections of Fossil Wood. Endogens from Antigua, etc. Palm, vertical and transverse. Palm, from West Indies and Ceylon. Fern, stem and root. Conifers and Exogens from Derbyshire, Port- land, Lough Neagh. Unknown forms from Lancashire Coal. Fibrous Fossil Wood, Egypt. Opalized Wood, Tasmania. Fossil Sponge. Fossil Coral, Acervularia pentagona. Pentacrinus basaltiformis. Sections of Coal. Transverse, Vertical and Radial. Derbyshire, Newcastle,, Yorkshire, Scotland, China, Australia, America, Hereclea on the Black Sea, Tertiary Coal, Bovey Tracey. WHOLE INSECTS, Etc. 50 cents to $1.50 each. Aphis, rosse, buxi and others. Mayflower-fly, Dilophus Ant, Formica rufa and others. Merrydancer, Hilara maura Blossom-fly, Anthomyia pluvialis. Mosquito, Culex Mosquito, various. Bronze-fly, Pachygaster ater. Biting Field-fly, Stomoxys, calcitrans. Biting (Clegg) Fly, Hcematopata pluvialis. Black-tip Fly, Ortalis vibrans. Cattle-fly, Musca corvina. Bombilus major. Corn-fly, Empis livida. E. stercorea. Crane-fly, Tipula, oleracea. Dunghill-fly, Spherocera subaltans. Dung-fly, Scatophaga merdana and others. Drone-fly, Helophilus pendulus. Flirt-fly, Sepsis punctum. Fantail-fly, Dolichopus ^Eneus. Fungus-fly, Mycetophila, various. Gnat, Culex pipiens (Sexes), the Male. " Window, Rhyphus fenestralis. " Ringed, Culex annulatus. " Plumed, Chironomus plumosa. " Winter, Trichocera hiemalis. " Wood, Sciara brunipes. Grass-fly, Opomyza germinationis. Hairy-fly, Bibio Marci, B. Johannis. Hawk-fly, Dioctria rufipes. Herbage-fly, Platypalpus fasciatus. His grace, Calobata petronella. House-fly, Musca domestica. Ichneumon-fly, Ophion luteum. Lace-Wing Fly, Chrysopa perla. Leaf Insect, Phyllophorella acerina. Midge, Psychoda. Mud-fly, Borborus longipennis. Marsh-fly, Tetanocera aratoria. Marsh Carne-fly, Phycoptera. May-fly, Ephemera vulgata. Nettle-fly, Platystoma seminationis. Pearl-fly, Sialis lutarius. Scorpion-fly, Panorpa communis. Shadow Watcher, Syritta pipiens. Snipe-fly, Leptis scolopacea. Snout-fly, Rhingea campestris. Saw-fly, Allantus scolopacea. Thrips, Phlseothrips coriaceus. Vinegar-fly, Drosophila cellaris. Unicorn-fly, Odontocera denticornis. Wasp-fly, Syrphus ribesii. Window-fly, Phora rufipes. Centipede, Lithobius forcipatus. Millipede, Geophilus electricus. Skin of Caterpillar, many species. " Silk worm, Bombyx mori. Corn-bug, Miris erraticus. Cuckoo-spit, Aphrophora spumaria. Collared Florist, Anthobium torquatum. Cardinal-beetle, Pyrochroa rubens. Beetle, Cercopsis sanguinolenta. Earwig, Forficula auricularia. Frog-hopper, Amblycephalus viridis. 4,S BENJ. PIKE'S SON jc CO., NEW YORK. Grasshopper, Locusta viridis. Glow-worm, Lampyrus noctiluca. (Sexes.) Grass-flea, Thyamis fomoralis. Lady-bird, Coccinella variabilis, etc. Parsnip-beetle, Anaspis melanopa. Pond-beetle, Lactophilus minutus. Mud-beetle, Hyphydrus ovatus. Marsh-flea, Delphax lineata. Raspberry-beetle. Soldier-beetle, Telephorus melanurus. Sailor-beetle, Halipus lineatocollis. Scissor-bug, Capsus planicornis. Thistle-beetle, Crepidodera ferruginea. Wood-beetle, Leptura levis. Water-beetle, Hygrotus elegans. Water-bug, Corixa fossarum. Water-boatman, Notonecta glauca. Water-scorpion, Nepa cinerea. Pond-skater, Gerris lacustris. Ditch-skater, Yelia rivulorum. One-Clawed Water-bug, Naucons cimicoides. Tingis, Larva, Pupa, Imago, various. Pseudo Scorpion, Chelifer cancroides. Earth-mite, Trombidium. Spiders. Bush-spider, Agelena nava. Garden-spider, Epeira diadema. Ground-spider, Lycosa agrestica. House-spider, Aranea labyrinthica. Harvest spider, Phalangium cornutum. Hunting-spider, Drassus lucifergus. Shepherd-spider, Opillio. Water-spider, Argyroneta aquatica. Water-wolf, Lycosa aquatica. Larva and Pupae. Pupa of water-boatman. Larva of Ant-lion, Myrmelio Formicarius. " Cardinal-beetle, Pyrochroa coccinea. " Dragon-fly, Ermine-moth. " May-fly, Lace-Wing Fly. " Water-beetles, various. " and Pupa of Gnat. In Fluid. Flea, House and Blow-fly. Bot-fly in Egg, on hair of Horse. " Staphylinus, Devil's Coach-horse. Lady-bird, Coccinella, also Pupa. Click-beetle (Wire-worm). About twice the number of Species here named are usually in Stock, and the Sexes of some can be supplied. PARTS OF INSECTS. 50 cents each. $5.00 per dozen. Antennas of Cockchafer, sexes, House-fly and Blow-fly, Moths, Gnat, sexes. Head of Butterflies and Moths, Crane-fly, Gnat, Mosquito (Lancets), Cockchafer, Crane-fly, Dragon-fly, House-fly, Humble- bee, Butterfly. Beetle, prepared to show multiplied images reflected from facets of Cornea. Gizzard of Dytiscus, Grasshopper, Katydid, Cricket, Flea. Stomach of Beetle, Blow-fly. Foot of Caterpillar. Leg and Foot of Blow-fly, Drone-fly, Dung- fly, Dytiscus, Frog-hopper, Gyrinus, Honey- bee, Hawk-fly, Hornet, Ophion, Pearl-fly, Saw-fly, Spiders, various, Wasp. Mouth and Jaws of Wasp, Spiders. Feathered Oar of Corixa, Dytiscus. Expanding Paddle, Gyrinus. Lancets of Flea, Bed-bug, Gad-fly, Musquito, Gnat. Ovipositor of Cuckoo-spit, Katydid, Cricket, Crane-fly, Blow-fly, Drone-fly, Dragon-fly, Saw-fly, Frog-hopper, .Corn-bug, Proboscis or Tongue of Butterfly and Moth, Honey-bee, Humble-bee, Blow-fly, House- fly, Cricket, Hawk-fly, Drone-fly, Rhingia. Reproductive Organs, Male Wasp, Hornet. Scales from Wings of Death's-head Moth Oak-egger, Cloth-moth, Paris Butterfly' Fritillary. Giant Silk-moth, Japan, and many others. BENJ. PIKE'S SON & CO., NEW YORK. 49 Spinneret of Silkworm, Garden-spider. Skin of Caterpillar, Chrysalis, Silkworm, Garden-spider. Spiracles of Blow-fly, Drone-fly, Cockchafer, Dytiscus, Privet Caterpillar. Sting of Bee. Hornet. Wasp. " with poison glaud. $1.00 Tail of Dolichopus ^Eneus. Trachea; of Silkworm, Blow-fly, and ultimate ramification in stomach of Bee, $1.00, in nerves of Caterpillar, $1.00. Intestines of Blow-fly. Halteres of Crane-fly, Rhingia, Drone-fly, Blow-fly. Wings of Bee, with hooklets, Hornet, with hooklets, Wasp, with hooklets, Blow-fly, Butterflies, various, Moths, various, Mos- quitoes. Elytron of Corixa fbssarum, Water-beetles, various. Winglet of Blow-fly. Anatomy of the Blow-fly, 12 Slides in a box, $6.00 OPAQUE AND BINOCULAR OBJECTS. 50 and 75 cents each. $5.00 and $7.50 per dozen. Whole Insects, etc. Tingis arcuata. Beetles and Weevils, various. Cicada from Maryland. Gall-fly, Typhloryba uloni. Asparagus-beetle. House-fly. British Diamond-beetle. Eggs of Insects, various; Parasite of Pigeon, Hornbill, Larvae of Oakegger. Eyes showing facets, from Beetle, House-fly Butterfly, Moth, Wasp, Dragon-fly. Eyes of Garden-spider. Aphis pierced by Ichneumon-fly. Legs of Dytiscus marginalis. Heads and Parts of Beetles. Cyphus germari. Cicindela sylvatica. Eustales adamantinis. Chrysolophus. Curculio imperialis. Eupholus. Hypomeces squamosus. Golden girdle. Exuvium of Myriapoda, Polyxenus. Wing of Magpie-moth, Butterfly, Azure Blue; Cloth-moth, Vaporer; Alexis, Clouded Yel- low ; Fritillary, Morphomenelaus, Paris, Peacock, Copper, Tortoise-shell, Red Ad- miral. Palate of Haliotis tuberculata, Limpet, Patel- la vulgaris; Periwinkle, Littorina littoralis ; Trochus zizyphinus, Whelk, Buccinum undatum; Gizzard of Cricket. Foraminifera, from Adriatic Sea, Bay of Bengal, Levant, River Nene, Caxhaven. Polycystina, Barbadoes, various. Fossil infusoria. Vegetable. Leaf of Deutzia, Nettle, with Stings, Elasag- nus, Onosma taurica, Alyssum Olympicum. Skeleton Leaf of Box-tree and Indian Ivy. Section of Leaf of Orchid, Stem of Clematis, Sugar-cane, Shell of Mexican Gourd, Pith of Rice Paper-plant. Spores of Quill-wort, from Cashmir. Seeds of Antirrhinum, Poppy, Henbane Lobel's Catch-fly, Orchis, Portulaca. Pollen of Hollyhock, Mallow, Portugal Pine, Geranium, Passion-flower, Lily, Scotch Fir. Peristomes of Mosses, many species. Funaria hygrometrica, mounted in a cell for Hygrometric experiment. Polyzoa, Corallines, etc. Anguinaria spatulata. Bicellaria ciliata. B. grandis. Bugula avicularia. Catenicella plagiostoma. Cellularia avicularis. Crisea eburnea. Flustra foliacea. Membranipora pilosa. Notamia bursaria. Sertularia operculata. Diatomacese on Sea-weed, in situ. Gemmules of Sponge. Hairs of Peccary, sections. Isthmia nervosa and enervis. 50 BENJ. PIKE'S SON Jc CO., NEW YORK. Orthosira arenaria. Shell of Orbitolite. Spines and Shell of Spatangus. Spicules of Gorgonias. Young Oysters. Feathers of Humming-birds, Love-bird, Pea- cock, Rifle-bird, Australia. Skin of Sole, Dog-fish, White Shark. Brittle Star-fish. Sun Star-fish. Bones of Ophiocoma rosula. Pedicellaria of Echinus sphaera, Echinus esculentus, Uraster rubens. Spines of Palmipes membranaceus. Sponge with Spicules, in situ. Spider-crab. Mantis Shrimp. Opaqne Minerals, etc. Avanturine (artificial). Hypersthene. Antimouy, Needle form. Red, Oxysulphuret. Crystals of Berberine, Picrotoxine. Oxalate of Lime. Crystalline Indigo. Bismuth. Sulphuret of Iron. Crystalline Oxide of Lead, Lead Ore. " Silver, Electro deposit. Native Gold from Peru, Natal and Persia. Gold Nuggets, California. " Dust, British Columbia. " Sand with Quartz, Australia. " Leaf transmitting Green Light. " Pure and Brilliant. Mosaic Gold. Fibrous or Moss Copper, Nat. formation. Granular Copper Ore, South America. Peacock and Ruby Copper. Iridescent Oxide of Lead. Pure Iridium. Crystals of Titanium, from Blast Furnace. Crystalline Lava, from Mount Vesuvius. Decomposed Glass from Pompeii. Sand or Dust from Eruption of Vesuvius, 1872. Mysterious Dendritic spots on Writing Paper. POLARISCOPE OBJECTS. 50 cents each. $5.00 per dozen. Chemical Crystals. Asparagine. Aspartic Acid. Bitartrate of Ammonia. Borax. Boracic Acid. Carbozotate of Potash. Carbonate of Lime, from Horse. " " " Boa-constrictor. Creatin. Cholesterin. Chlorate of Potash. Chloride of Barium. Cinchonine. Cinchonidine. Citric acid. Ferrocyanide of potassium. Iodide of Potassium. Iodo-disulphate of Quinine. Murexide (Dichromatic). Naphthaline. Nitro-prusside of Sodium. Oxalate of Lime. Oxalate of Ammonia. Oxalate of Chromium and Potash. Oxalic Acid. Oxalurate of Ammonia. Platino-cyanide of Magnesia. " " Barium. Platino-cyanide of Thallium. Pulmose Quinidine. Quinidine. Santonine. Salignine. Salicine. Strychnine. Sugar. Sulphate of Cadmium. " Nickel and Potash. " Copper. " Spiral form. Copper and Magnesia. Tartaric Acid. Thionurate of Ammonia. Triple Phosphate, various forms. Urea. Uric Acid. Uric Acid from Boa-constrictor. Wine Crystals. Bitartrate of Potash. Animal Substances. Palate of Haliotis tuberculata, Limpet, Patella vulgaris, Nassa reticulata, Periwinkle Trochus zizyphinus, Whelk. Claw of Ourang-outang, Lynx, Sloth, Lioness | Wild Cat, Fowl, Polar Bear, Seal. BENJ. PIKE'S SON Finger Nail—Human. Cuttings. Toe Nail, Transverse Section. Corns of Elephant. " Human. Foot-Pad of Dromedary, Cat. Hoof of Antelope, Elk, Pig, Ox, Mustang, Reindeer, Zebra. Horn of American Bison, Antelope, Brahmin Bull, African Rhinoceros, Indian Rhinoc- eros. Quill of Porcupine. Whisker of Walrus. Stones and Minerals. 75 cts. each, Actinolite. Avanturine. Agates, various. Asbestiform Serpentine. Carbonate of Lime. Carrara Marble. Gibraltar Rock. Granite, various localities. Labrador Feldspar. Jasper with Amethyst. Quartz Rock,various. Quartzite, Mont Blanc. Satin Spar. Sandstone. Selenites, various colors. & CO., NEW YORK. 51 Spines of Hedgehog. Cat's Tongue. Section of Cat's Tongue, Nose and Lip. Bone of Cuttle-fish. Whalebone, Finland Whale, Bottlenose, Be- luga Catodon. Embryo Oysters. Exuvium of Prawn. Teeth of Medicinal Leech. Tendon Achilles, Human. Tendon of Ostrich. Leg of Dytiscus. Elytron of Dytiscus. Silicious Cuticles—From Araucaria imbri- cata, Bamboo-cane, Sugar-cane, Equisetum arvense, Dutch Rush, E. hyemale Indian Corn, Canary-seed, Husk of Rice Grain, Straw of Rice, Leaf of Wheat. Fibro Cells from brides roseum, Oncidium bicallosum. Scalariform vessels from Fern, Dicksonia An- tarctica. Spiral vessels Rhubarb. Fern Scales, Cheilanthes Eckloniana, Elapho- glossum squamosum, Nothochlaena maran- ta, Nothochlaena laevis. Stellate Hairs from Elaeagnus. Wing of Seed of Eccremocarpus. Animal Substances. Skin, Human (vertical section); Negro Scalp, with incipient Curl in Roots of Hair; Alli- gator of the Nile; Giraffe, with Hair; Lip of Calf, with Hair; Lip of Cat, with Hair ; Nose of Cat; Eel, with Scales in situ; Sole, with Scales in situ; Synapta, Anchors in situ. Scales of Carp, Eel, Perch, Sole, Gudgeon and Mullet. Tail of Whitebait. Crystals of Carbonate of Lime, in Tail of Prawn and Shrimp. Plates from Skin of Holothuria. Anchors, etc., from Synapta. Hair, Human, White with Age, Roots and Eyebrows, Shavings of Beard, Albino Girl, Infant, Young Lady's Eyelash, Gorilla, Brahmin Bull, Reindeer, Polar Bear, White Mouse, Persian Cat, Angora Goat, Mohair, Elephant's Tail, section. OBJECTS, Sulphate of Baryta. Zeolite from Giant's Causeway. Polariscope Objects Moving in Fluid Animal Substances, Mixed. Actinolite. Brazilian Pebble Fragments. Crystalline Sulphate of Lime. Fibrous Sulphate of Lime. Rolling Stones, various. Young Oysters. Vegetable Substances. Starch from Arrowroot, Calabar Bean, Col- chicumautumnale, Potato, Oats, Rice, Sago, Palm, Tapioca, Tous les Mois, Ginger, Maize, Barley, Wheat. Section of Potato, Starch in situ. Cuticle of Leaf of Correa cardinalis, Deutzia scabra, Elaeagnus, Onosma taurica. BENJ. PIKE'S SON & CO., NEW YORK. VEGETABLE PREPARATIONS. 60 cents each.......$6.00 per dozen. Sections of Woods, Stems, etc. The number 3 indicates that Three Sections of Stems are on one Slide, Transverse, Vertical and Radial. Arancaria excelsa, 3. Apple-tree, Pyrus malus, 3. Asparagus, Asparagus officinalis. Aristolochia sipho, Ornithocephalus. Baobab-tree, Adansonia digitata. Berberry, Berberis vulgaris. Beech, Fagus sylvatica, 3. Brake-fern, Pteris aquilina. Brava, Cissampelos Pereira. Burdock, Arcticum lappa. Butcher's Broom, Ruscus aculeatus. Cane, Bamboo, 3. Bambusa, 3, Malacca, Calamus scipionum, Rattan, Calamus rotang, 3, Sugar, Saccha- rum officinarum, 3, Wanghae. Catalpa syringaefolia, 3. Cedar of Lebanon, Cedrus Libanus, 3. Cherry-tree, Cerasus communis, 3. Cinnamon, Cinnamonum Zeylanicum. Chili Pine, Araucaria imbricata, 3. Cocoa-nut Palm, Cocus comosa. Cork-tree, Quercus suber, 3. Cutleya Leopoldii. Dendrobium nobile, speciosum. Dog-rose, Rosa canina. Dragon-tree, Dracaena ferrea. Date-palm, Phoenix humilis. Elder, Sambucus nigra, 3. Fennel, Fceniculum officinale. Fig-tree, Ficus carica. Gesnera grandis. Gum-tree, Eucalyptus, 3. Gutta-Percha Tree, Isonandra gutta. 3. Grape-vine, Vitis vinifera. Hibiscus Africanus, 3. Ivy, Hedra helix. India-rubber, Ficus elastica. Jasmine. Jasminum officinale. Lavender, Lavandula vera. Lace Bark, Lagetta lintearia, 3. Land Rush, Juncus communis. Larch, Larix, 3. Larix Europa_jus, 3. Lemon-tree, Citrus limonum. Magnolia grandiflora. Mahogany, Swietenia mahogoni, 3. Maple, Acer campestre, 3. Mimosa Nilotica. Mulberry, Morus Nigra, 3. Miltonia cuneata. Mistletoe, Viscum album. Oak, Quercus pedunculata, 3. Orange-tree, Citrus auranteum, 3. Pampas-grass, Gynerium argenteum. Passion-flower, Passiflora quadrangularis. Pepper (Australia), Piper Alba. " (Malacca), P. Nigrum. Pear-tree, Pyrus domestica. Pine, Pinus strobus, 3. I Pine-apple, Ananas lucida. Pilea Smilacifolia. I Plane-tree, Platanus Occidentalis, 3. Sanseviera Zeylanica. | Sarsaparilla, Smilax officinalis. Satin-wood, Chloroxylon Swietenia. Screw-pine, Pandanus odoratissimus. Sea Rush, Juncus maritimus. Sunflower, Helianthus annuus. Sandal-wood, Santalum album. 3. Tea-tree, Lycium barbarum. Traveller's Joy, Clematis vitalba. Upas (Java), Antiaris toxicaria, 3. Water-plantain, Alisma plantago. Water-lily, Nuphar luteum. Walnut, Juglans regia, .3. Wellingtonia gigantea, 3. Willow, Salix alba, 3. Yew, Taxus baccata, 3. Section of Petiole of Arum, Cinnamon, Date- palm, India-rubber, Oleander. Bulb of Orchid, sections. Pith of Rice Paper-tree. Root of Wellingtonia gigantea. Root-fern, Petris aquilina. Roots of various Trees. Bark " BENJ. PIKE'S SON & CO., NEW YORK. 53 MICRO-PHOTOGRAPHS, 60 cents each. Lincoln Cathedral. The Blind Fiddler. Equestrian Statue, Richard II. The Dame's School. Cupid and Psyche. Laying Down the Law. The Planet Jupiter, Belts and Moons. Cathedral of Milan. Hindoo Mosque, A. D. 1400. York Minster. £1000 Bank-Note. Statue of Sabrina. Title-Page of Punch. Fingal's Cave. Happy as a King. Melrose Abbey. Una and the Lion. The Moon. The Ten Commandments. The Lord's Prayer. The Origin of Species. View in the Alps. German Iron-Clad. Bridge at Hamburg. West Indian View. " Unser Fritz." Steamship Saxonia. Falls of Niagara. Prussian Bank-Note, 25 Thalers. Bolton Abbey in the olden time. The Giant's Causeway: The Emperor Napoleon. The Fall of Nineveh. The Alhambra in Singapore Harbor. The Ascent of Mont Blanc. . $6.00 per dozen. The Planet Saturn, Rings of. Belfast Naturalists' Club. The Crucifixion (M. Angelo). Hagar and Ishmael. The Horse Fair (Mile. Bonheur). The South Sea Bubble. Balmoral Castle. The Derby Day. Raising the May-Pole. The Maid of Saragossa. Dickens' Christmas Carol. View of Stockholm. • The Proposal. Lord Byron. Head of Christ. London. Alpine Glacier. View in Heligoland. Palace in Potsdam. Ruins of Church, Norway. View of Hammerfest. St. Stephen's Church, Vienna. Cupid. Luna and Endymion. Apollo and Daphne. View in Norway. Temple of Vesta, Rome. Map of North America. View in Pompeii. View of Rome. 100-Thaler Bank-Note. Grotto at Capri. Un portant mal Payi. Declaration of Independence, $1.00. SERIES OF POPULAR OBJECTS. 25 cents each. $3.00 per dozen. $5.50 for two dozen in box. Six dozen, in handsome Mahogany case, with twelve trays and lock, . . . $20.00 In order to meet the demand for objects of a popular character, at very low prices, we have prepared a very large variety of beautiful, interesting and valuable subjects, at the above cheap rates. These comprise about one hundred varieties of Diatoms, many species of Algae, Marine and Fresh-water, Foramnifera, Polycistina, Spicules of Synapta, Gorgonia and Sponges, insect parts in immense variety—opaque and transparent, some whole insects, vegetable°preparations of every kind, including some Double Stainings; in short, a wonderful variety of objects deservedly popular. They are all clean, neatly mounted and correctly named, and though not selected as those named in the foregoing lists, many of them will be found fully equal in all particulars to the more expensive ones. An assortment will be sent on selection, the same as the others. SOLAR MICROSCOPES. 145-446. The Solar Microscope is an instrument for magnifying ordinary Microscope Object, to the extent of from ten to twenty feet in diameter, and exnib^ng tl emon a screen in a darkened room before a class, or audience, by means of the sun's rays, reflected by a large mirror. DIRECTIONS FOR USING THE SOLAR MICROSCOPE. . , intn ,,.._,. the SUI1 is Shinin<^ and a hole being made about six iuches in diameter in the window shutter or in a board pro- Select a wmdow ™*"*£*^^™£^^ and secured, the mirror remaining outside of the shutter, and the long tube or body video for the purpose into wlnchihe nstmment * p ^ ^ ^ ^ ^ ^ ^ h h the b dy of th of the instrument mside. The m™™™™*™^ head scr£ws till' the rays 0f the sun pass directly through the tube and form a large and instrument. The mirror ^^^^Sayt^SItoLce of tin to twenty feet. The screen is made of white muslin and the sess^ ,s ,,e,d - ,is p,mc ,,y meaM °[;:: w DO* CO O a o o BENJ. PIKE'S SON & CO., NEW YORK. 55 READING AND PICTURE GLASSES. 450-462. No. Price. 450. Reading Glass, oxidized metal frame, double convex lens, 2 inch, diameter, $0 75 451. " " " m " 1 25 452. " " " 3 " 1 50 453. " " " m " 2 00 454. " " " 4 3 00 455. " German Silver frame, a superior article, 2 1 00 456. " " " 1% " 1 50 457. " " " 3 " 2 00 458. " " " 3^ " 2 50 459. " " 4 3 50 460. " " " 4J^ '« 4 50 461. " " " 5 " 6 00 462. " " " 51^ " 7 00 463. Gallery Glass, " "8 " 10 00 464. Reading Glass, gilt metal frame, ivory handle, one double convex lens, 2 inches diameter,...........1 50 465. Reading Glass, gilt metal frame, ivory handle, one double convex lens, 2J^ inches diameter,...........2 25 466. Reading Glass, gilt metal frame, ivory handle, one double convex lens, 3 inches diameter,...........3 00 467. Reading Glass, gilt metal frame, ivory handle, double convex lens, 4 inches diameter,.............5 00 468. Reading Glass, gilt metal frame, ivory handle, double convex lens, 4% inches diameter, ...........7 00 469. Reading Glass, gilt metal frame, ivory handle, double convex lens, 5 inches diameter,.............8 50 470. Gallery Glass, gilt metal frame, ivory handle, double convex lens, 8 inches diameter,.............15 00 471. Reading Glass, German silver frame, black handle, 2x3 inches, . . 2 50 472 " " " 2T\x3)^ inches, . 3 50 473. " " " 2T\x3£ " . . 4 50 56 BENJ. PIKE'S SON & CO., NEW YORK. CODDINGTON LENSES, Etc. 482. No. 484-485. 486. 488. 480. Coddington Lens, Brass, with handle, large, 481. " " " " medium, . 482. " « " " small, 483. " " in small Silver case, very powerful, 484. " " in smaller " " 485. " " solid Gold case, 486. Microscope, with Glass Cage for Seeds and Live Insects, small size, 487. " " " 488. " on three legs, Brass, with Adjusting Screw, GERMAN SILVER POCKET MAGNIFIERS. 495. 496. 501. 495. German' Silver Pocket Magnifier, \yz inch, diameter, single, 496. " " " " " '• double, 497. " " " " " " triple, 498. " " " " l*g inch. " single, 499. " " " " " " double, 500. " " " " " " triple, 501. Linen Provers, Brass, for counting Threads in Cotton, Silk, etc.. 50 cents and 502. •' German Silver, " " " Price. $2 00 1 50 1 00 3 50 7 50 20 00 1 00 1 50 1 00 $1 00 1 25 1 50 1 00 1 50 1 75 75 SI 00 and SI 25 BENJ. PIKE'S SON & CO., NEW YORK. POCKET MAGNIFIERS. 57 510. Hard rubber case and frame, round form, 1 double convex lens, 511. 512. 513. 514. 515. 516. 517. 518. 519. 520. 521. 522. bellows form, 520. Price. %in. 1 diam. SO 30 40 i u u 60 90 80 % i u 90 40 60 % i u 65 90 % u 90 i d 1 25 Rubber case and frame, 1 double convex lens, ^ inch diameter, of high power at one end, and 1 double convex lens, % inch diameter, of medium power at the other end,......... 523. Combination of Three Lenses, mounted in tortoise-shell, for the pocket, with ring for attaching to watch-guard, . . '..... 1 25 525. 529. 626. 525. Watchmaker's Glass, hard rubber frame, 1 double convex lens, % inch to % inch diameter, various powers,......... 526. Watchmaker's Glass, hard rubber frame, 2 double convex lenses, % inch diameter, very high power,........ 527. Engraver's Glass, horn frame, 1 double convex lens, % to 1 inch diameter, 528. Engraver's Glass, horn frame, 2 plano-convex lenses, 1 inch diameter, 529. Engraver's Glass, hard rubber frame, 2 plano-convex lenses, 1% inches diameter,........... $0 50 1 00 40 1 00 1 50 ~>S BENJ. PIKE'S SON & CO., NEW YORK. PORTABLE ACHROMATIC HAND TELESCOPES. No. 540. 542. 544. 548. 555. Price. 540. Achromatic Telescope, with Brass body, covered with Morocco Leather, having three draws, and being about 15 inches long when drawn out, and 6 inches long when closed. Object-glass, 1 inch diameter; magnifying power, 15 times,...........$2 50 541. Achromatic Telescope, with Brass body, covered with Morocco Leather, having three draws, and being about 16 inches long when drawn out, and 6 inches long when closed. Object-glass, \y% inch diameter; mag- nifying power, 20 times,........ 3 50 542. Achromatic Telescope, with Brass body, covered with Morocco Leather, having three draws, and being about 23 inches long when drawn out, and 8 inches long when closed. Object-glass, \% inches diameter; mag- nifying power, 25 times, ........ 5 00 543. Achromatic Telescope, with Brass body, covered with Morocco Leather, having three draws, and being about 30 inches long when drawn outj and 10 inches long when closed. Object-glass, 1% inches diameter: mag- nifying power, 30 times,......... 7 50 544. Achromatic Telescope, with Brass body, covered with Morocco Leather, having four draws, and being about 37 inches long when drawn out, and 11 inches long when closed. Object-glass, 1% inches diameter; magni- fying power, 35 times,..........12 50 545. Achromatic Telescope, with Brass body, covered with Morocco Leather having four draws and Sun-shade, and being about 42 inches long when drawn out, and \\% inches when closed. Object-glass, 2% inches diam- eter; magnifying power, 40 times,...... ^0 00 516. Achromatic Telescope, with Brass body, covered with Morocco Leather having four draws and Sun-shade, and being about 48 inches long when drawn out, and 13J£ inches long when closed. Object-glass, 2% inches diameter; magnifying power, 50 times, ■••... 30 00 BENJ. PIKE'S SON & CO., NEW YORK. 59 547. Achromatic Telescope, with Brass body, covered with Morocco Leather. having five draws and Sun-shade, and being about 53 inches long when drawn out and 13 inches long when closed. Object-glasses 2| inches in diameter; magnifying power 70 times, .... 548. Achromatic Marine Telescope, with Brass body, covered with Morocco Leather, having one draw, and being about 28 inches long when drawn out and 16 inches long when closed. Object-glass 1-J- inches in diameter: magnifying power 35 times...... Price. $40 00 10 00 STANDS FOR TELESCOPES. 555. Wooden Tripod Stand of light weight, well made, with vertical and horizontal movements,.......... 556. Wooden Tripod Stand of larger and heavier construction, having vertical and horizontal movements,......... 557. Wooden Tripod Stand, with Metal Supports for Telescope, and fittings for giving vertical and horizontal movements. This is a very firm and substan- tial stand, and will support an instrument of large size and considerable weight with great steadiness,......... 558. Creedmoor Telescope Stand, the legs of which fold together very com- pactly, making a very portable instrument and one that is very popular. ADJUSTABLE CLAMPS FOR HOLDING TELESCOPES, 560. Brass Adjustable Clamp, to fit Telescope No. 542, 561. 562. 563. 564. 565. $5 00 00 15 00 10 00 No. 542..... 2 00 No. 543, .... 2 75 No. 544, .... 3 25 No. 545, .... 3 75 No. 546, . 4 25 No. 547, .... 5 00 60 BENJ. PIKE'S SON &■ CO., NEW YORK. 575. BENJ. PIKE'S SON & CO., NEW YORK. 61 FINE TELESCOPES ON STANDS, FOR LANDSCAPE AND ASTRONOMICAL PURPOSES, (microscope and telescope lenses, page 64.) No. Price. 570. Landscape Telescope, with Object-glass 2^ inches in diameter; body 35 inches long, covered with Morocco Leather, with Brass Mountings and Sun- shade ; Rack adjustment to Eyepiece, magnifying 50 diameters. Mounted on a firm, well made and handsomely finished Walnut Stand, with vertical and horizontal movements,..........$40 00 571. Landscape Telescope, with Object-glass 2% inches in diameter; body 40 inches long, covered with Morocco Leather, with Brass Mountings and Sun- shade; Rack adjustment to Eyepiece, magnifying 60 diameters. Mounted on a firm, well made and handsomely finished Walnut Stand, with vertical and horizontal movements,.......... 50 00 572. Landscape, or Astronomical Telescope, with Object-glass of the finest quality, 2% inches in diameter; body 39 inches long, covered with Morocco Leather, with Brass Mountings and Sun-shade. One Terrestrial Eyepiece magnifying 60 diameters, and one Celestial Eyepiece, with Sun-glass, mag- nifying 100 diameters, and Rack adjustment for focusing. Mounted on a firm, substantial Walnut Stand, with metal supports and bearings for giving vertical and horizontal movements,........85 00 573. Landscape, or Astronomical Telescope, with Object-glass of the finest quality, about 3 inches in diameter; body 47 inches long, covered with Morocco Leather, with Brass Mountings and Sun-shade. One Terrestrial Eyepiece magnifying 65 diameters, and one Celestial Eyepiece, with Sun- glass, magnifying 125 diameters, and Rack adjustment for focusing. Mounted on a firm, substantial Walnut Stand, with metal supports and bear- ings for giving vertical and horizontal movements......100 00 574. Landscape, or Astronomical Telescope, with Object-glass of the finest ijuality, 3-jj\f inches in diameter; body 54 inches long, covered with Morocco Leather, with Brass Mountings and Sun-shade. One Terrestrial Eyepiece magnifying 70 diameters, and two Celestial Eyepieces, with Sun-glasses, magnifying 100 and 150 diameters, and Rack adjustment for focusing. Mounted on a firm, substantial Walnut Stand, with metal supports and bear- ings for giving vertical and horizontal movements,.....140 00 575. Astronomical Telescope, with Finder, with Object-glass of the finest quality, about 'i}4 inches in diameter; body about 54 inches long, made entirely of Brass, highly finished, and having a well corrected Finder at the side. One Terrestrial Eyepiece magnifying 60 diameters; three Celestial Eyepieces and Sun-glasses magnifying respectively 75, 100, 150 diameters, and Rack adjustment for focusing. Mounted on our new and improved, first class Stand, with Walnut legs, and highly finished brass supports and bear- ings for giving vertical and horizontal movements, .... 175 00 576. Astronomical Telescope, with Finder, with Object-glass of the finest quality, 4 inches in diameter, 60 inches focal length; body made entirely of Brass, highly finished, and having a well corrected Finder at the side, with adjusting screws and cross hairs. One Terrestrial Eyepiece magnifying about 75 diameters; 3 Celestial Eyepieces and Sun-glasses, magnifying re- spectively 100, 150, 200 diameters; and Rack adjustment, for focusing. Mounted on our new and improved first-class Stand, with Walnut legs, and highly finished brass supports and bearings for giving vertical and horizon- tal movements, . . . • • ■ . • • • • • 225 00 57 7 Astronomical Telescope, with Finder, with Object-glass of the finest quality, 4^ inches in diameter, 72 inches focal length; body made entirely of Brass, highly finished, and having a well corrected Finder at the side, with adjusting screws and cross hairs. One Terrestrial Eyepiece magnify- ing about 80 diameters; 4 Celestial Eyepieces and Sun-glasses, magnifying respectively 100, 150, 200, 250 diameters; diagonal Eyepiece and Rack ad- justment, for focusing. Mounted on our new and improved first-class Stand, with Walnut legs and highly finished brass supports and bearings, for giving vertical and horizontal movements,.......325 00 <>li BENJ. PIKE'S SON &• CO., NEW YORK. BENJ. PIKE'S SON & CO., NEW YORK. 63 ASTRONOMICAL TELESCOPES, mounted on equatorial stands. (microscope and telescope lenses, page 64.) Our Astronomical Telescopes, Equatorially Mounted, which are described below, are instruments of rare excellence. We have given special attention to the production and perfection of Telescopes of this class, and can say with confidence that, for the purposes intended, they are superior to instruments of foreign manufacture costing twice as much. The Achromatic Object-glasses of these Telescopes (upon the accuracy of which the value of the instruments depend), are made of the finest quality of Crown and Flint Glass, selected "with great care in regard to its specific gravity, and ground to that perfection, in regard to its correction for spherical and chromatic aberration, as only the highest skill in this art has attained in modern times. No. Price. 580. First-Class Astronomical Telescope, with Object-glass 3| inches in diam- eter, and about 44. feet Focal length; fitted in a highly finished Brass tube, with adjustable Finder at the side, having cross hairs; Rack adjustment for focusing. One Terrestrial Eyepiece, magnifying 60 diameters, and 3 Celestial Eyepieces, with Sun-glasses, magnifying respectively 75, 100 and 150 diameters. Mounted on improved Equatorial Stand, having Declination Circle, with 2 Verniers reading to 3 minutes. Latitude Circle divided into single degrees ; and Hour Circle, with Vernier reading to 30 seconds, . $200 00 581. First-Class Astronomical Telescope, with Object-glass 4 inches in diam- eter, and about 5 feet Focal length; fitted in a highly finished Brass tube. with adjustable Finder at the side, having cross hairs; Rack adjustment for focusing. One Terrestrial Eyepiece, magnifying 75 diameters, and 3 Celestial Eyepieces, with Sun-glasses, magnifying respectively 100, 150 and 200 diameters. Mounted on improved Equatorial Stand, having 7 inch Declination Circle, with 2 Verniers reading to 3 minutes. Latitude Circle divided into single degrees, and Hour Circle, with Vernier reading to 30 seconds,........., • • • . 250 00 582. First-Class Astronomical Telescope, with Object-glass 4£ inches in diam- eter and about 6 feet Focal length ; fitted in a highly finished brass tube, with adjustable Finder at the side, having cross hairs; Rack adjustment for focusing. One Terrestrial Eyepiece, magnifying 80 diameters; 1 Diagonal Eyepiece and 4 Celestial Eyepieces, with Sun-glasses, magnifying respectively 100, 150, 200 and 250 diameters. Mounted on improved Equa- torial Stand, having 7 inch Declination Circle, with 2 Verniers reading to 3 minutes. Latitude Circle divided into single degrees, and Hour Circle, with Vernier reading to 30 seconds,........350 00 583 First-Class Astronomical Telescope, with Object-glass 5 inches in diam- eter, and about 7 feet Focal length, and haviug the same Mountings, Adjustments, Eyepieces, etc., as No. 582........500 00 584 First-Class Astronomical Telescope, with Object-glass 6 inches in diam- eter, and about 8 feet Focal length, having the same Mountings, Adjust- ments, Eyepieces, etc., as No. 582,........600 00 64 No. 590. 591. 592. 593. 594. 600. 601. 602. 603. 604. 605. 606. 615. 616. 617. 618. 619. 620. 621. 622. BENJ. PIKE'S SON &• CO., NEW YORK. EYEPIECES FOR TELESCOPES. Celestial Eyepieces of any power, with Sun-glass, each, Terrestrial " •' Diagonal or Prismatic Eyepiece, " Solar Prismatic Eyepiece, " Sun-Glass, set in Brass Cap, ACHROMATIC OBJECT-GLASSES FOR TELESCOPES. Achromatic Object-Glass, 1%, inches diameter, 18 to 30 inches focus, \% " " 18 to 30 " 2 " " 18 to 30 " " " extra fine finish, 2 in. diam., 36 in. focus, .i a 2% " 44 " " 3 " 48 3).< " 54 ACHROMATIC OBJECT-GLASSES OF THE FINEST .QUALITY. Achromatic Object-Glass, 3 inches in diameter, 45 inches focal length, 31. 4 4'.< 5 6 7 S 50 60 72 84 96 108 120 Price. $6 00 7 50 12 00 20 00 1 50 2 00 3 50 4 00 6 00 10 00 25 00 50 OO 50 00 75 00 100 00 140 00 250 00 400 00 600 00 800 00 630. 631. 632. 633. 634. 635. 636. 637. 638. 639. 640. 641. 00SM0RAMA LENSES. Double or Plano-Convex Lens, 8 inches diameter, and either 30, 36, 48 or 72 inches focus, each, .......... Double or Plano-Convex Lens, 7 inches diameter, same foci as 630, each, Double or Plano-Convex Lents, 6 inches diameter, of either 24, 30, 36, 48 or 72 inches focus, each,......... Double or Plano-Convex Lens, 5 inches diameter, of either 18, 20, 24, 30 36, 48 or 72 inches focus, each,........ Double or Plano-Convex Lens, 4 inches diameter, of either 12, 14, 16, 18, 20, 24, 30, 36, 48 or 72 inches focus, each,..... Double or Plano-Convex Lens, 3 inches diameter, any focus 6 to 36 inches, each, ............ Double or Plano-Convex Lens, 2 inches diameter, any focus 6 to 36 inches each, ............ Double or Plano-Convex Lens, 134 inches diameter, any focus 5 to 48 inches, each, ........... MICROSCOPE AND TELESCOPE LENSES. Double or Plano-Convex Lens, 1 inch diameter, 2 inches focup, . .1 | .1 .. 11 .. ., ......I " " 4 " " . . " * " " 1 4 00 3 00 2 50 1 75 1 25 75 60 50 75 75 75 75 BENJ. PIKE'S SON & CO., NEW YORK. 65 BINOCULAR TELESCOPES. 650. 651. The Binocular Telescope, or Signal Glass, of Extraordinary Power, is the Per- fection of instruments of this class. It consists of two telescopes, each of about 12 inches in length, fitted together by a joint, so that when in use the exact distance between the eyes may be obtained. The magnifying power being fully three times as great as that of the ordinary Field Glass, renders it invalu- able on prairie ranges, or where distances of many miles are to be covered at a glance. It is made and finished in the finest manner, the body and Sun-shades being covered with fine Calf-skin, and is furnished with a solid leather case and strap. No. Price. 650. Binocular Telescope, with Rack Adjustment for width of eyes, Object- glass 1T5T inches diameter,..........$75 00 651. Binocular Telescope, with Hinge Adjustment for width of eyes, Object- glass lTsff inches diameter,..........50 00 652. Binocular Telescope, 8 inches long, with Hinge Adjustment, without Sun- shades, Object-glass 1 inch diameter,........40 00 5 66 BENJ. PIKE'S SON & CO., NEW YORK. THE LONG RANGE RECONNOITERING GLASS. 655. This is a Glass of very high power and perfect definition, magnifying twice as much as the ordinary Field Glass. It is about 7 inches in length, finished in the finest manner, the body and Sun-shades being covered with fine Calf-skin, and has a graduated joint for regulating the distances between the eyes. It is furnished with a solid leather case and strap. No. Price. 655. The Long Range Reconnoitering Glass,.......$30 00 THREE POWER FIELD GLASSES. 656. 656. These Glasses are very much the same as the regular Field Glasses, with the exception of the Eyepieces, which revolve, carrying three pairs of glasses each of different magnifying power, for Theatre, Field or Marine purposes as may be required. They are finished in the finest manner, the body and Sun-shades being covered with Morocco Leather, and are furnished with stiff leather cases and straps. Body, 34 inches long, Object-glass, 17 lines or \% inches in diameter u 4| « a a a 19 a a ^ a a a " 5 " " " " 21 " " 1% " " 8 2A 35 00 40 00 45 00 68 BENJ. PIKE'S SON & CO., NEW YORK. THE CHALLENGE RACE GLASS. 661. This is a special Glass of extraordinary power, for use in the Field, Theatre, or on the Racecourse; small enough to carry in the pocket, being the size of an Opera Glass, but hav- ing the power of a large Field Glass, twice the number of lenses than ordinary being used in its construction. It is finished in the finest manner, the body being covered with Calf-skin, and is furnished with either, a strong leather sling case, with strap, or with a soft leather case for the pocket, as may be desired. Those in doubt as to which glass to decide on, will do well to order this one, as it cannot fail to give entire satisfaction. No. Price. 661. The Challenge Race Glass, in case,.........$20 00 ALUMINIUM OPERA GLASSES. 662. Opera Glasses having their mountings made of Aluminium are so exceedingly light in weight, that they can be held to the eyes for any length of time without the least fatigue. 662. Opera Glass, having fine Achromatic lenses, the mountings being of Aluminium, covered with Morocco Leather, and having a soft leather case. Body 2% inches long; Object-glass 13 lines, or 1A inches in diameter, $15 00 " 2% " '• " 15 " ]& » ■. 18 00 " 2% " " 17 ■' \y% ■' « 22 0Q " 2^ " " - 19 •' lTi •• ' » 25 00 BENJ. PIKE'S SON & CO., NEW YORK. OPERA GLASSES. 69 No. 663. 663. Opera Glass, of excellent quality, with Achromatic lenses, the mountings being black, and the body covered with black Morocco Leather, and having a soft leather case. Body, 2J4 inches long; Object-glass, 13 lines, or 1A inches in diameter, " 2^ " » « 15 » i,- 17 ' Price. $3 50 " 3H " " " 19 " Itt 664. Opera Glass, of superior quality, with Achromatic lenses, the mountings being black, and the body covered with black Morocco Leather, and having a soft leather case. Body, 2 inches long ; Object-glass, 13 lines, or IX inches in diameter, " 2% " " " 15 " 1A " " 2% " " " 17 " 13^ " " ii 3 " a a jg u jif a u 00 50 00 50 00 00 00 OPERA GLASSES OF EXTRA QUALITY. 665. 665. Opera Glass, of the finest quality, finished in the most perfect manner, with Achromatic lenses, the mountings being black, and the body covered with Morocco Leather, and having a fine soft leather case. Body, 2 inches long; Object-glass, 13 lines, or 1A inches in diameter, 1 6 a ii 2% " " " 15 u 2% " " " 17 a 3 a a a 19 666. Opera Glass, of the finest quality, finished in the most perfect manner, having twelve lenses, which render its correction for color most perfect, the mount- ings being black, and the body covered with fine Morocco Leather, in soft case. Body, 2 inches long; Object-glass, 13 lines, or 1A inches in diameter, " 2% " " " 15 " 1A " " " 2% « » » 17 " \% " " 3 " " " 19 " Hi " $8 00 8 50 9 50 11 00 13 00 14 00 16 00 18 00 70 BENJ. PIKE'S SON &• CO., NEW YORK. OPERA GLASSES OF SUPERIOR QUALITY. 667. No. 667. Opera Glass, of superior quality, with Achromatic lenses, the mountings being black, with gilt trimmings, and the body covered with fine Calf-skin, making a neat and elegant glass, and having a soft leather case. Body, 234 inches long; Object-glass, 13 lines, or 1A inches in diameter, a 2% " " ' " 15 " 1A " " 2% " " " 17 " \% " " 3 " " " 19 " \\\ " " 668. Opera Glass, of superior quality, with Achromatic lenses, the mountings being nickel, and the body covered with fine Calf-skin, and having a soft leather case. Body, 2J^ inches long; Object-glass, 13 lines, or 1A, inches in diameter, « 2y2 " " 15 " ia " " 2% " " 17 il \% " " 11 3 a a 19 a j|| a a PEARL OPERA GLASSES OF SUPERIOR QUALITY. Price. $8 00 9 00 10 00 11 00 8 00 9 00 10 00 11 00 669. Opera Glass, of superior quality, with Achromatic lenses, the mountings being of metal richly gilt, and the tops and bodies of the purest white pearl, and having a fine soft leather case. Body, \% inches long; Object-glass, 11 lines, or 1 inches in diameter 13 " IA i;„ 2^ 2% 2% 15 17 19 w 670. Opera Glass, of superior quality, with Achromatic lenses, the mountings being of metal richly gilt, and the tops and bodies of elegant pearl of varied colors—oriental. This is the richest and choicest glass for the price tliat has ever been produced. Body, \% inches long; Object-glass, 11 lines, or 1 inches in diameter a V/s „ 2% " " a 2% " " a 25/ a a 13 l 18 1-nr 15 " h\ 17 ' J* 19 " Hi 10 00 12 00 13 00 15 00 17 00 12 00 13 00 15 00 17 00 20 00 BENJ. PIKE'S SON & CO., NEW YORK. 71 GRAPHOSCOPES. The Graphoscope has become one of the most popular instruments of its kind that has ever been produced. It combines facilities for magnifying pictures of any size or kind, and can readily be adjusted to any vision, raised or lowered, or folded into a convenient form for transportation. The Graphoscopes] which we manufacture and offer for sale are made of rosewood or walnut, polished and finished in such an elegant manner as to make them a desirable article for the drawing-room or library. The Large Lens for pictures, and the smaller pair of Stereoscope Lenses for stereo scopic views, are made of the best crown glass, combining the highest magnifying power with the greatest brilliancy. No. Price. 680. Rosewood Graphoscope, with large lens 3^ inches in diameter, . . $6 00 681. " " " 5 " ... 10 00 682. " " elegantly finished, with large lens, 5 inches in diameter, 20 00 683. " " " " " 6 • " 25 00 684. " " • ' " " " 7 " 30 00 BENJ. PIKE'S SON is CO., NEW YORK. OPHTHALMOSCOPES. 694. No. 690. 690. Loring's Ophthalmoscope, with mirror \% inches in diameter, and revolving disk at back, containing 12 lenses, six each convex and concave, of 3, 5, 8, 12, 18, 36 inches focus; double convex condensing lens 1)^ inches in diam- eter, in hard rubber frame; in Morocco snap case, 691. Loring's Ophthalmoscope, similar in form and size to No. 690, with one mirror and one condensing lens, and a series of ten convex and eleven concave lenses of the Dioptric System, set in a revolving disk, covered with metal to preserve them from dust,..... Loring's Ophthalmoscope, similar in size and form to the preceding, but with two mirrors, two condensing lenses of 2)^ and 3 inches focus, and three revolving disks containing a series of twenty-three lenses, convex and con- cave, from 2 to 60 inches focus, of the Inch System, . Loring's Ophthalmoscope, the same as 692, with the addition of a rectan- gular mirror, swung on two pivots, to tilt both ways to angles of 20° or 25°, which can be readily substituted for the ordinary circular mirror- in snap Morocco case,....... ' 694. Dr. Badal's Ophthalmoscope, with two mirrors \% inches in diameter two revolving disks at back of mirror, one containing lenses Nos. 1 2, 3 4 5 6 both convex and concave; the other lenses 0.25, 0.50, 0.75 and 13*convex and 13 concave, all of the Dioptric System, the disks arranged to be used in combination, with a double convex condensing lens in frame; all contained in a neat Morocco case for the pocket, 692. 693. Price. $14 00 17 50 20 00 25 00 16 00 BENJ. PIKE'S SON & CO., NEW YORK. LORING'S NEW IMPROVED OPHTHALMOSCOPE. 73 695. "No. Price. $35 00 €95. Loring's New Ophthalmoscope, in Morocco case,..... This instrument consists of a disk, and a quadrant of a disk carrying the lenses. The single disk contains sixteen glasses on the metric system, the plus being numbered in white and the minus in red. The first row of numbers, or that just beneath the glass, shows the real value of the glass; the second or inner row shows the result of the combinations when the quadrant is in position. The quadrant rotates immediately over the disk and around the same center, and contains four glasses, -5-16, and +5+16. When it is not used the quadrant is beneath its cover. The instrument then represents a simple Ophthal- moscope with sixteen perforations, the series running with an interval of I D, and extend- *ne from I to 7 plus, and from I to 8 minus. This is ample for all ordinary work, as the in- terval of I D is as close as even an expert usually desires, and can, with a little experience, 'be used for even very minute discrepancies. For if in a given case the fundus is seen dis- tinctlv with I D and a little to spare, while 2 D blurs the picture, we know at once that the refraction must be between the two, or I 5 D. If, however, for any reason we wish to prove Sis conclusion, we can bring up 0 5 D. From this glass we get successive half-dioptric from I to 8 Dlus and from I to 9 minus. In this way we have, so to speak, a fine and coarse ad- iiwtmeiias in the microscope. If the higher numbers are desired, these are obtained by iomSLnswth those of Ihe quadrant. These progress regularly up to 16 D, every diop- trw? befng maTked upon the disk; above this, up to +23 D and -24 D, we have simply to add the glass which comes beneath the 16 D, turning always in the same direction. The mirror shown in the drawing is the " tilting " form. If preferred, the common circu- lar mirror can be employed. 74 BENJ. PIKE'S SON & CO., NEW YORK. 696. No. Price. 696. Liebreich's Ophthalmoscope, with two convex condensing lenses, and a series of five lenses of different foci, fitted to an arm behind the perforated mir- ror; in Morocco case,..........$5 00 DEMONSTRATION LENSES. 700, 701. 700. Set of Six Demonstration Lenses, 1% inches in diameter, including Plane, Double Convex, Plano-Convex, Double Concave, Piano-Concave and Menis- cus Lenses, . ......... 701. Large Set op Six Demonstration Lenses, about 2% inches in diameter, MAGNIFYING AND DIMINISHING MIRRORS. 702. Magnifying Mirror, 6 inches diameter, in black wooden frame, 703. Diminishing " 6 " " " " " 704. Magnifying and Diminishing Mirrors in one, black wooden frame, . 705. Mirrors in mahogany frame, one side magnifying, the other plane, 5 inches in diameter, a finer article,......... 706. Mirrors in mahogany frames, same as No. 705, 5% inches in diameter 707. " " " " No. 705, 6 " " 708. " " " " No. 705, Magnifying and Diminishing, in one frame,............ 2 50 7 50 2 oo 2 50 4 50 2 50 3 00 3 50 5 00 BENJ. PIKE'S SON & CO., NEW YORK. LARYNGOSCOPES. 75 709. No. Price. 709. Tobold's large Laryngoscope without Lamp, with two Laryngeal Mirrors, com- plete in a cise,............$22 00 URINOMETERS. 710. Urinometer in case, for the pocket,.........1 00 711. " " " " with graduated jar,.....2 00 712. " " " " " " " and thermometer, 4 00 CLINICAL THERMOMETERS (SELF-REGISTERING). 1.lM|iu'|iui|iiii|iiii|iul|»lll|i|lll|lllll|ilnl|iili|illll|itll|iiii|llll|IIH|liii|inl|llli'|ini| .nf---------■ •m 5. PIKE—CO 100 MEW-YORK 5 D 715. 715. Clinical Thermometers, 3, 3-J-, 4, 5, 6 inches long, in hard rubber cases, each . $2 00 716. English Clinical Thermometers, 3, 3|, 4, 5, 6 inches long, in boxwood cases, . 3 00 717 » " " with indestructible indexes, 3 to 6 inches long, in German silver cases, . . . 3 50 718 » il ' ' with indestructible indexes, 3 to 6 inches long, in coin silver cases,.....5 00 70 BENJ. PIKE'S SON & CO., NEW YORK. SETS OF TRIAL LENSES. 725. No. Price. 727. 728. $100 00 125 00 70 00 7 25. Nachet's Complete Set of Trial Lenses contains 32 pairs convex lenses, 32 pairs concave lenses, from 2 to 72 inches focus; 19 piano-cylindrical convex lenses, 19 piano-cylindrical concave lense3, from 6 to 60 inches focus; 9 prisms, angles from 2 to 10 degrees; 4 plain colored glasses, 1 white glass disk, 1 half ground surface, 2 metal disks with stenopaic slit, 1 metal disk with hole and 1 solid metal disk, graduated trial frame, and 1 not graduated, for holding the various lenses. The whole packed in a Morocco covered case, with lock and key, ..... 726. Nachet's Trial Set of Lenses, same as No. 725, but with the cylindrical lenses in pairs,............ Nachet's Trial Set of Lenses, consisting of 23 pairs spherical convex and 23 pairs spherical concave lenses, from 2 to 72 inches focus; 12 cylindrical convex and 12 cylindrical concave, 8 to 60 inches focus; 6 prisms, 2° to 8°, 2 disks, 1 plane glass, 1 ground glass, all mounted in handsome metallic frames; 3 colored glasses, and a graduated frame for holding the various lenses. The whole packed in a Morocco case, Nachet's Set of Trial Lenses, same as No. 727, but having the cylindrical lenses in pairs,............85 00 729. Series of Trial Sights, consisting of 23 pairs spherical convex, and 23 pairs spherical concave lenses, from 2 to 72 inches focus; 12 cylindrical convex and 12 cylindrical concave, 8 to 60 inches focus; 6 prisms, 2° to 8°; 2 disks, 1 plane glass, 1 ground glass, all mounted in handsome metallic frames; 3 colored glasses, and a graduated frame for holding the various lenses. The whole packed in a polished mahogany case,..... 730. Series of Trial Sights, consisting of 23 pairs spherical convex and 23 pairs spherical concave lenses, from 2 to 72 inches focus; 12 cylindrical convex and 12 cylindrical concave, 8 to 16 inches focus; 6 prisms, 2° to 8° • 2 disks, 1 plane glass, 1 ground glass, all unmounted; 3 colored glasses, and a graduated frame for holding the various lenses. The whole packed' in a polished mahogany case,........ The above sets are furnished numbered, either in inches, or according to the dioptric system, as desired. 55 00 40 00 BENJ. PIKE'S SON & CO., NEW YORK. 77 No. 735. 736. 737. 738. 739. 740. 741. 742. 743. 744. 745. 746. 747. 748. 749 Nachet's Improved Trial Frames, graduated on the outside, for adjusting Cylindrical Glasses, aud having superior arrangements for holding spheri- cal glasses, together with adjustable nosepiece and sliding bar for measur- ing the distance between the eyes,........ Trial Spectacle Frame, with double cells to each eye, the outer ones graduated to 180°, for reading the astigmatic axis of the eyes. With these frames any desired combination of spherical and cylindric lenses can be given to the patient for trial; per pair,....... Green's Set of Test Diagrams, for detecting astigmatic eyes. This set consists of a pasteboard dial 12 inches in diameter, divided into 12 parts, as a clock dial. To this a series of 14 diagrams of lines and circles can be attached separately at pleasure, and made to revolve against the face of the dial,............. Astigmatic Dial. A conicular disk of tin japanned white, and divided on the margin of one side to every five degrees and numbered; over this another, but smaller, disk revolves, having two series of black lines on it which are at right angles, though not crossing one another. The lines are adjusted for 20 feet test of astigmatism (No. 20), Snellen's, Grafe's Wire Optometer for detecting astigmatism, with tape measure attachment,............ Dr. Pray's Series of Astigmatic Letters, on stiff card-board for hanging. These letters are made up of black lines and white spaces, the white and black spaces of each letter being all ruled at one angle in each letter, and this angle being varied for every letter. There are 12 letters, and the angles of the lines are horizontal, 15°, 30°, 45°, 60°, 75°, 90°, 105°, 120°, 135°, 150°, 165°,........... Snellen's Test Types, bound iD paper,..... Snellen's Test Types, bound, J^ leather, Jaeger's Test Types, Nos. 1 to 14, bound in % leather, Snellen's Test Letters, Nos. VIII. to C. on heavy card-board, 15x23 inches Per card,........... Snellen's Test Figures, Nos. VIII. to C. Per card, . Dr. Otto Becker's Set of Four Diagrams for detecting and measuring astigmatism,........... Dr. Burkhardt's Series of Dots and Lines for determining and measur- ing degree of Myopia, Hypermetropia, Presbyopia, and Astigmatism. A set of four cards,........... Dr. Keyser's "Prosopanometer," for measuring the width of face, width and depth of bridge for spectacles......... Strabismometer of Ivory, . . . Price. $10 00 5 00 5 00 2 50 7 00 50 2 00 2 75 1 00 50 50 \ 3 00 4 00 4 00 1 50 7N BENJ. PIKE'S SON is CO., NEW YORK. TRIAL GLASSES IN HARD RUBBER FRAMES. 755, 756. No. 755. Trial Glasses in Hard Rubber Frames, 5 to 48 inches focus, Convex, 756. " " " " 5 to 48 •' Concave. Price. $10 00 10 00 56 BENJ. PIKE'S SON & CO., NEW YORK. 79 760. No. PRICE- 760. Auzoux's Dissected Model of the Eye; the most perfect and accurate ever made. The material is Papier-Mache, and the. whole is accurately dissected, so as to be taken apart, showing successively the Sclerotic and Choroid coats, and Cornea, Retina, Iris, Pupil, Crystalline Lens, Aqueous and Vitreous Humors, the Muscles, Nerves and Blood - Vessels, colored as in the natural eye, with full descriptive pamphlet,........$35 00 761. The same, but of German manufacture,.......30 00 762. Human Eyeball, enlarged size. Can be taken to pieces, and then shows the cornea, iris, crystalline lens, vitreous humor, and the coatings, including the results of microscopic examination upon the retina, . . . . 6 50 763. Map and Diagram of the Eye (22 by 15 inches), handsomely colored, with de- scriptive letter-press,...........1 00 764. Artificial Human Eyes, of all sizes and colors, each,.....10 00 STEREOSCOPES, 770. 770. Stereoscope, large glasses, walnut frame and hood, 771. 772. 773. 774. 775. 776. mahogany or walnut frame and hood, elegantly Stereoscope, large glasses, rosewood frame and hood, elegantly finished, u ' " same as No. 770, on Stand, " No. 771, " ... « " " No. 772, '• ... French Achromatic Stereoscope, very fine,..... 1 00 80 BENJ. PIKE'S SON & CO., NEW YORK. THE HUMAN EYE. ANATOMICAL CONSTRUCTION OF THE EYE. The interior of the Eye is a dark chamber, containing certain almost perfectly transparent refractive media, through which all light must pass in order to reach the Retina. This refractive media consists of the Cornea (extending from/to /), the Aqueous Fluid (B), between the Cornea and the Crystalline Lens (A), and the Vitreous Matter (C), occupy- ing the space between the Crystalline Lens and the Retina (i p). The Retina is a nervous expansion of the Optic Nerve (d), spreading over the entire back of the Eyeball. On the Retina of the eye the images of objects looked at are formed, by refraction through the Cornea, Crystalline Lens, etc., and the impressions thus made are transmitted to the brain by the Optic Nerve, creating sensations, which make us conscious of the existence of outside objects. The Ophthalmoscope enables us to see the images thus formed on the Retina of the human eye by looking into it through the pupil. This transparent refractive media of the eye may be regarded as a compound lens with curvatures so adjusted that in the perfectly constructed eye, the images of objects looked at are formed or focused clearly and sharply on the sensitive layer of the Retina. This is the condition of the Emmetropic, or perfect eye (see diagram, page 81), and the difference between such eyes and others, giving more or less imperfection of vision, is caused simply by the relative distance between the Retina and the refractive media being displaced by the flattening or lengthening of the eyeball itself, or the imperfection in the curvature of the refractive media; for while the human eye as an optical instrument is of the most perfect design, it is found very often to be of imperfect construction. BENJ. PIKE'S SON & CO., NEW YORK. emmetropic, or perfect eye. hypermetropic, or far-sighted eye. FAILING SIGHT. Daily observations with the Ophthalmoscope prove to us that at no period of life is the transparency of the interior of the eye so perfect as in childhood, while it gradually dimmwhes with age ■ hence it follows that even if there were no other causes to produce the effect, the acuteness of vision must naturally be greater in youth than it is in after life. The diminution of the transparency of the interior of the eye progresses with such uniform regularity with advancing years, that practised ophthalmoscopists are able to approximate the age of the patient by the relative clearness of this interior matter. When a person with Emmetropic, or perfect eyes, arrives at the age of about thirty-five vears he prefers for reading print a little larger than he would have done five or fenyears previously, and he holds the book a little farther from his eyes and seeks a stronger Lg The difference, however, is so slight, and the change has been so gradual, that it has craned his notice At forty it becomes more perceptible, and he begins to be conscious that ZPraJo1 see small print in a dim light quite as well as formerly, but still he gets along verv weUand sufferVbut little inconvenience. At forty-five he finds he has trouble in TILT ordinarv print by artificial light. In writing he does not keep accurately on the vie ruled lines, but still by bright daylight he sees very well, but instinctively avoids tZ vrint In the course of a few months he has trouble even in the daytime in seeing fine ■^rint and the effort becomes painful. He is now conscious and willing to admit that his £2Tare failina We use the words, " willing to admit," because a great many persons take 73J£ in boasting that they have arrived at middle age and still have undiminished acute- Pn!rnTh6"persuade themselves into the belief that their bodily vigor is so great 5S senilechanges cannot affect them, and only acknowledge their mistaken views when actually compelled to do so by being no longer able to read, write, or do fine work with the unassisted eyes. a a * rP=mlr of this gradual change in the condition of the eyes with advancing years, *i. Ir^mP Hatter thus shortening the distance between the Crystalline Lens and the T>fLr*nd causing 'the impression or image of the object looked at to form behind the Retina, ■ ?JS of rUarlv and sharply on the same. The eyes have now become Hypermetropic or far-sfghted^Se diagram fbove), and for the correction of the same, the use of convex glasses are absolutely necessary. the necessity of using spectacles. Many persons are prejudiced against the use of glasses, and decline to wear them when their use is imperatively demanded. 82 BENJ. PIKE'S SON &• CO., NEW YORK. This is altogether wrong: for, in attempting to read small print, they strain the muscles of accommodation by requiring them to act beyond their strength. To preserve the sight unimpaired the longest possible time, it is requisite, as soon as it begins to fail, to consult & practical and experienced optician, who will advise and select the iveakest glasses that will make near vision easy and neutralize the deficiency, thus art/finally restoring the eyes to their normal condition. The object of using glasses is not to magnify the print, but to make it appear distinct, and, as nearly as possible, of the same size as before the vision was impaired. • THE INJURIOUS EFFECTS OF USING GLASSES TOO STRONG. As the result of many years'1 observation and experience, we find that the majority of people seriously injure their eyes by the use of too strong glasses at first; this creates the necessity of changing them soon and often, for those of a stronger power. The habitual use of glasses too strong in the commencement of failing vision is the most powerful factor in inducing rapid senile changes in the Crystalline Lens and muscles of accommodation; the Ciliary muscles are relaxed, and only required to contract to a certain point. They soon become enfeebled and lose the power to act beyond their accustomed tension. This state of tension soon indicates their maximum strength, which cannot long be main- tained; hence glasses of higher power must be substituted to relieve the strained accommo- dation. HOW TO USE SPECTACLES JUDICIOUSLY. In general it should be observed, that it is desirable to increase the strength of the glasses but slowly; and in using glasses for the first time, to do so only in the evening, and to keep those for day use as soon as stronger ones are required for the evening, and thus every time that stronger glasses are required to continue using the former weaker ones by daylight. All persons having used glasses for several years, who desire to keep their eyes in the most perfect state of preservation possible, consistent with the inevitable senile changes, should have two pairs of spectacles, a stronger pair for night, and a weaker pair for day use; and when a stronger pair is necessary for artificial light, the former night glass may be substituted for use by daylight. Finally, that while stronger glasses are necessary for reading, the weaker are often suffi- cient for writing, and are to be preferred, since the person wearing them, being enabled to see at a greater distance, can avoid the bent position, which is so injurious to the eyes. MYOPIA, OR NEAR-SIGHTEDNESS. MYOPIC, OR NEAR-SIGHTED EYE. Myopia, or near-sightedness, is a condition of the eye exactly the reverse of Hypcrme- tropia, or far-sightedness. It consists of an abnormal extension or elongation of the eyeball, which places the Retina beyond the focus of the Crystalline Lens, thus causing the images of objects looked at to form within the vitreous matter of the interior of the eye, before reaching the Retina on which, in order to give perfect vision, it should focus clearly and sharply (see diagram above). BENJ. PIKE'S SON & CO., NEW YORK. 83 To artificially neutralize this deficiency, and thus restore the image to its proper position on the Retina, the use of concave glasses is necessary. Near-sightedness is almost universally regarded as a hereditary disease. The emmetropic, or normal eye, rarely becomes near-sighted without a predisposition to it derived from ancestors, but that condition having once occurred, it is often transmitted as a predisposition to posterity, and under fresh exciting causes is developed to its higher degrees. Thus the hereditary principle accumulates in the posterity the effects of the causes repeated in every generation. By means of the Ophthalmoscope it is clearly shown that the near-sighted eye i*s diseased, and that the grade of near-sightedness is proportionate to the degree of extension of the organ caused by morbid anatomical changes. The question then very naturally arises, can near-sightedness be cured ? The answer must unhesitatingly be in the negative. It is simply absurd to suppose that the dense, firm, and but slightly elastic fibrous tissues, forming the sclerotic coat of the eye, after softening and extension, can ever be restored to their normal condition, so that the softened and extended fibres will contract, and bring the posterior part of the sclerotica back to its original form and thickness. This change never takes place. Formerly near-sightedness was thought to be caused by an excessive convexity of the Cornea, and systematic efforts were made to lessen this by compression; but now, since it is univer- sally acknowledged to be dependent upon the giving way of the sclerotic tissues causing a . backward elongation of the eyeball, we can readily see that such treatment is not only useless, but injurious. Near-sightedness, then, is incurable, and only the mildest grades are neutralized by the com- pensation of senile changes at an advanced period of life. As the eye cannot be restored to its normal condition, the treatment must consist in endeavoring to arrest the progress of abnormal changes, and at the same time rendering vision easy and comfortable, by neutralizing the deficiency as far as possible by the use of concave glasses. The selection of spectacles for near-sightedness is a matter of great importance, on account of the morbidly distended condition of the eyeball, and its tendency to get worse. Therefore, it is very essential, that only glasses of the finest quality should be" used in con- nection with the eyes. ASTIGMATISM. Astigmatism is caused by imperfections in the curvatures of the Cornea and Crystalline Lens of the eye, creating disturbances of vision, whereby the images of objects refracted on the Retina appear distorted and of unnatural shapes, parts of them being sharply seen, while other parts are indistinct; as, for instance, in looking at a series of horizontal or vertical lines at a distance of twenty feet or so, instead of each and every line being seen clearly and sharply, some will appear clear, while others will be seen more or less indistinctly. Eyes so perfectly constructed as to be absolutely free from all errors of refraction in their optical axes are never met with. Therefore astigmatism may be said to exist, to a very slight extent, in all eyes; but these deviations in the regularity of the curvatures of the surfaces of the Cornea and Crystalline Lens are usually too slight to disturb the acuteness of vision, but when of higher degree the perfection of vision is seriously impaired. In the higher grades of astigmatism the use of cylindrical glasses for its correction is very essential and a source of great gratification and pleasure to those, who, for the first time, become aware that their heretofore distorted and imperfect vision is capable of being vastly improved and benefited by the use of glasses of the proper curvature. In eyes exhibiting astigmatism of the higher grades, it is very often discovered upon examination that not only are both eyes astigmatic, but that combined with it, also, is myopia or hypermeiropia; while again this may exist only in one eye, while the other may be emmetropic or without defect. When the eyes are found upon examination, to be in this condition, it is very necessary and important that each eye should be tested separately, and glasses of different curvatures furnished for each. 84 BENJ. PIKE'S SON & CO., NEW YORK. DIRECTIONS FOR ORDERING SPECTACLES. In ordering Spectacles from this Catalogue, it is only necessary to answer the following questions, viz.: How long have you worn spectacles ? Have those you have worn ached or fatigued your eyes ? Do you require Spectacles for reading or for seeing at a distance ? Can you read Test Type No. 1, on the following page, by bright daylight, in holding it about fourteen inches from your eyes ? Can you read Test Type No. 2, on the following page, by bright daylight, in holding it about fourteen inches from your eyes ? Can you read Test Type No. 3, on the following page, under the same circumstances ? Can you read Test Type No. 4, on the following page, under the same circumstances ? If you cannot read the Test Types at about fourteen inches from the eyes, at what distance can you read them ? By answering the above questions, we can furnish the proper Spectacles, which will be sent by mail, pre-paid, at the prices quoted. TO OCULISTS. We have the greatest facilities for the manufacture of Spectacles, and Lenses for the same, for the correction of Astigmatism, Strabismus, Cataract, Myopia, Hypermetropia, and other malformations of the eyes, requiring Cylindrical, Prismatic, Concave, Convex, and other Lenses of different curvatures, and are prepared to furnish the same at very greatly reduced prices. (See page 93.) Prescription Blanks, like the following, will be furnished on application, on which it is only necessary to write the formula and enclose it to us by mail, when the order will be attended to with the greatest promptness and the most absolute accuracy. *-? RIGHT EYE. LEFT EYE. Spherical Spherical Cylind. Axis: Cylind. Axis: Prism. ° Base: Prism. ^ Base: Distance between centers of pupils, - inch. " " temples, ------ «< " from Cantlius to crest of nasal bone, - u M. O. BENJ. PIKE'S SON & CO., NEW YORK. 85 No. 1. CAN YOU READ THIS PRINT BY BRIGHT DAYLIGHT AT ABOUT 14 INCHES FROM THE EYES? W* tgtin turn from the aiego of Boston, to tHs invuion of Canada, which at that time ahared the anxioui thought! of Washington. His last accounts of the movement* of Arnold, left him at Point Levi, opposite to Quebec. Something brilliant from that daring officer was anticipated. It was his intention to cross the river immediately. Bad he done so, ha might hare carried the town by a eoup de main: for terror as well as disaffection prevailed among the inhabitants. At Point Levi, however, he was brought to a stand; not a boat wan 10 be found there. Letters which he had despatched some days previously, by two Indians, to Generals Schuyler and Montgomery, had been carried by his faithless messengers, to Caramhe, the lieutenant-governor, who, thus apprised of the impending danger, had caused all the boats of Point Levi to be either removed or destroyed. Arnold was not a man to be disheartened by difficulties. With great exertions he procured about forty birch canoes from the Canadians and Indians, with forty of the latter to navigate them; but stormy winds arose, and for aome days the river was too boisterous for such frail craft. In the meantime the garrison at Quebec was gaining strength. Recruits arrived from Nova Scotia. The veteran Maclean, too. who had been driven from the mouth of the Sorel by the detachment under Brown and Livingston, arrived down the river with his corps of Boyal Highland Emigrants, and threw himself into the place. The Lixard frigate, the Hornet sloop-of-war, and two armed schooners were stationed in the river, and guard-boats patrolled at night. The prospect of a successful attack upon the place was growing desperate. On the 13th of November, Arnold received intelligence that Montgomery had captured St. Johns. He was instantly roused to emulation. His men, too, were inspirited by the news. The wind had abated ; he determined to cross the river that very night. At a late hour in the No. a. CAN YOU READ THIS PRINT BY BRIGHT DAYLIGHT AT ABOUT 14 INCHES FROM THE EYES? We again turn from the siege of Boston, to the invasion of Canada, which at that time shared the anxious thoughts of Washington. His last accounts of the movements of Arnold, left him at Point Levi, opposite to Quebec. Something brilliant from that daring officer was anticipated. It wal his intention to cross the river immediately. Had he done so, he might have carried the town by a coup de main; for terror as well as disaffection prevailed among the inhabitants. At Point Levi, however, he was brought to a stand ; not a boat was to be found there. Letters which he had despatched some days previously, by two Indians, to Generals Schuyler and Montgomery, had been carried by his faithless messengers, to Caramhe, the lieutenant- governor, who, thus apprised of the impending danger, had caused all the boats of Point Levi to be either removed or destroyed. Arnold was not a man to be disheartened by difficulties. With great exertions he procured about forty birch canoes from the Canadians and Indians, with forty of the latter to navigate them; but stormy winds arose, and for some days the river was too boisterous for such frailBcraft In the mean time the garrison at Quebec was gaining strength. Recruits arrived from Nova Scotia. The veteran Maclean, too, who had been driven from the mouth of the Sorrel by the detach- ment under Brown and Livingston, arrived down the river with his corps of Royal Highland Emigrants, and threw himself into the place. The Liiard No. 3. CAN YOU READ THIS PRINT BY BRIGHT DAYLIGHT AT ABOUT 14 INCHES FROM THE EYES? frigate, the Hornet sloop-of-war, and two armed schooners were stationed in the river, and guard-boats patrolled at night. The prospect of a successful attack upon the place was growing desperate. On the 13th of November, Arnold received intelligence that Montgomery had captured St. Johns. He was instantly roused to emulation. His men, too, were inspirited by the news. The wind had abated ; he determined to cross the river that very night. At a late hour in the evening he embarked with the first division principally riflemen. The river was wide ; the current rapid ; the birch canoes, easy to be upset, required skilful management. By four o'clock in the morning, a large part of his force had crossed without being perceived, and landed about a mile and a half above Cape Diamond, at Wolfe's Cove, so called from being the landing-place of that gallant commander. Just then a guard-boat, belonging to the Lizard, came slowly along shore and.dlscovered them. They hailed it, and ordered it to land. Not complying, It was fired into, and three men were killed. The boat instantly pulled for the frigate, giving vociferous alarm Without waiting the arrival of the residue of his men, for whom the canoes had been despatched, Arnold led those who had landed to the foot of the cragged defile, once scaled by the intrepid Wolfe, and scrambled np it in all haste. By daylight he No. 4. CAN YOU READ THIS PRINT BY BRIGHT DAYLIGHT AT ABOUT 14 INCHES FROM THE EYES? had planted his daring flag on the far-famed Heights of Abraham. Here the main difficulty stared him in the face. A strong line of walls and bastions traversed the promontory from one of its precipitous -ides to the other, inclosing the upper and lower towns. On the right, the great bastion of Cape Diamond crowned the rocky height of that name. On the left was the bastion of La Potasse, close by the £ inches long, This Spectroscope will show many of Fraunhofer's lines, the bright lines of the metals, and gases, and the absorption bands in colored gases, crystals and liquids. THE STUDENT'S SPECTROSCOPE. 1210. 1210. The Student's Spectroscope, packed in a fine Mahogany case, . . $60 00 This Spectroscope has a fine prism of extremely dense glass. The circle is divided and reacts with a vernier, thus dispensing with the inconvenience of an illuminated scale This arrangement possesses the very great advantage of giving angular measurements instead of those of an entirely arbitrary scale. The slit is furnished with a reflecting prism, by means of which two spectra can be shown in the field of view at the same time. This instrument is so arranged that with a slight alteration of the adjustments it can be used for taking the refractive and dispersive powers of solids or liquids. LARGER IMPROVED CHEMICAL SPECTROSCOPE, 1220. No. Price. 25' 00 1220. Larger Improved Chemical Spectroscope, packed in a fine Mahogany case,.......... This Spectroscope is made entirely of brass, highly finished, containing three very dense glass prisms, two Eyepieces; rack motion to telescope and tangent screw motion to vernier. Practically, it is an instrument of great value, as it not only widely separates the D line of the solar spec- trum, but also shows the nickel line between the same. 013�67 SACCHAROMETER, FOR THE POLARIZATION OF SUGAR. 1230. No. Prick. 1230. Saccharometer, on Stand, for the Polarization of Sugar (made by Schmidt , 77 Nicol's Prisms............................. 36 Nobert's Test Lines.......................... 46 Objects, Microscope.........................37-53 " " for beginners............. 25 Object-glasses for Telescopes................ 64 Odometers................................... 104 Oil of Cloves_____ Opaque Disk Revolv Opera Glasses...... Ophthalmoscopes Optometers..... "X page; Parabolic Reflectors........................U\lf Passometers................................. Jxl Pedometers.............-.................... 1x3 Pebbles, Brazilian............................ f» Picture Glasses............................... 55 Pipettes..................................... 32 Pocket Aneroid Barometers.................. J™ Polarizing Apparatus......................... i? Prisms, Amici's............................ J^j " Double Image....... ............... " Equilateral.......................... J* " Nachet's............................. 14 " Nicol's............................... 36 " On Stands.......................... 3b Right angle.......................... *f Punches...................................... 32 Pumps, Air................................... 31 Prosopanometer.............................. "< Rain Gauges................................. 109 Razor for Cutting Sections................... 29 Reading Glasses.............................. 55 Reflector, Silver Side......................... 14 Scissors for Dissecting........................ 29 Section Cutters............................... 29 Selenites, Darker's series................--- 14 Films............................ 14 Stage............................... 14 Silver Side Reflector........................ 14 Spectacles, Gold.................-..........86,87 '• Frameless........................87, 88 " Silver............................ 87 Steel............................88,89 " Wire Gauze...................... 89 Coquille.......................... 89 Spectroscopes...........................14, 110, 111 Spectrum Scale.............................. 14 Spot Lens.................................... 14 Stands for Telescopes....................... 59 Stereoscopes................................. 79 Storm Glasses................................ 100 Strabismometer.............................. 77 Sugar Polariscope............................ 112 Saccharometer for Polarizing Sugar.......... 112 Spectacle Lenses..:.......................... 93 Syringes for Injecting........................ 30 Table for Heating Objects.................... 30 Telescopes, Binocular................ ...... 65 Astronomical.................61, 62, 63 " Landscape....................... 58 " " large...................60,61 " Portable.......................... 58 Test Diagrams............................... 77 " Types................................... 77 Thin Glass Circles and Squares............... 30 Turn Tables..................................30, 31 Thermometers, Boxwood.................... 98 " Clinical..................... 75 Parlor........................ 99 " Pocket....................... 98 Registering.................. 99 " Sixes......................... 99 Tin Case.................... 98 " Window...................... 99 " Wood Back................ 98 Three Leg Magnifiers......................... 56 Tourmalines................................14, 36 Trial Frames................................. 77 " Lenses..................................76, 78 Troughs, Glass..............................15, 18 Turn Tables.................................30, 31 Urinometers................................'.. 75 Valentine's Knives...........................29, 31 White Zinc Cement.......................... 32 Wooden Slips, for mounting................. 30 Writing Diamonds...........................32, 33 Zoophyte Trough...........................15-18