REPORT ON THE WATERS OF THE INDIANAPOLIS \ jaterijorfes (jo. and o( j jhite }{irt'r • tJ J J *J J J TOGETHER WITH ANALYSES OF THE SAME, MADE TO THE BOARD OF HEALTH OF THE CITY OF INDIANAPOLIS. BY L- T. C. VAN NUYS, M. D., Professok of Chemistry, Indiana State University- : ,, FEBRUARY 1, 1BB1. [Reprint from the Annual Report of the Board of Health.] INDIANAPOLIS: JOURNAL COMPANY, PUBLISHERS AND PRINTERS. 1881 . REPORT AND ANALYSES OF THE WATERS OF THE Indianapolis Water Works Co. and of White River. T. C. VAN NUYS, M. D. Professor of Chemistry, Indiana State University. State University Laboratory, > Bloomington, Indiana, January 31, 1881. } To the Board of Health of the City of Indianapolis: Gentlemen :—At your request I have made analyses of the water supplied your city by the Water Works Company, and also of the water of White River, taken from different places. This work was carried on with the intention of ascertaining the quality of the water delivered by the Water Works Company, with especial reference to its use for drinking purposes. The result of these analyses, together with other waters from various sources, and with such remarks as I have considered ap- propriate to elucidate the subject, I have the honor herewith to submit. The numbers in the tables represent parts per 100,000 parts of the water. Dividing each number by 100 would give the number of grammes in one litre, or multiplying each number by seven, and moving the decimal point to the right one place, will give the num- ber of grains in one imperial gallon. 2 Report and Analyses of the Waters of th e Description. Date. 1 Total Solids, Dried at 180° Cent. Chlorine. Cl. Nitric Acid, Anhyd. Na Or, S3 "2 o i Organic mat'er ! before seitling. Organic matter [ after settling. “ 1 Lime. Ca O. Magnesia. Mg O. Degrees op Hardness. Temp’ry. Perm’nt. 05 c 1. From a hydrant—the Water Works April,1880 Not est’d. 10 68 2.14 .003 Not est’d. 4. 92 14.8 4.12 Not est’d. Not est’d. 20. 57 2. From a hydrant—the Water Works June, 1880 47. 30 18.90 1.74 . 0038 Not est’d. 8.46 12.88 4. 62 Not est’d. Not est’d. 19.6 3. From the hydrant in Court House Sept., 1880 39.26 3.95 1.27 .0012 Not est’d. 5. 53 11.8 4. 569 10.6 3.8 14.4 4. From the hydrant in Court House Dec., 1880 51.88 7.50 1.31 .012 Not est’d 4. 74 Not est’d. Not est’d. 11. 1.2 12.2 5. From well of Water Works Oct., 1880 46. 01 2.79 2.4 .02 Not est’d. 3.63 14.03 4. 97 15.2 5.7 v;0.9 6. From well of Water Works Dec., 1880 64.40 16.59 1.9 .015 Not est’d. 2.29 Not est’d. Not est’d. 12.62 1.78 14.4 7. From White River, near Water Works Oct., 1880 28.63 0. 418 0.357 .002 6. 98 6.41 S. 95 3.88 11.68 2.7 14.38 8. From White! River, near Water Works Dec., 1880 Unfilter’d 0.369 1.1 .004 31.83 9.02 Not est’d. Not est’d. 6.55 1.75 8.3 58.99 Filtered. 27.41 9. From White River, three miles above city.. Oct., 1880 26.92 0. 206 0.306 .002 5. 76 5.43 8.18 4.3 11.51 2.7 14.21 10. From White Riv., above bridge, Cold Spring Dec., 1880 29.0 0.2 1.45 .005 9.96 9.25 Not est’d. Not est’d. 6. 45 1.65 8.1 11. From Murphy’s well, on Schumann’s farm. Dec., 1880 34.0 0.0508 0.9 . 003 Not est’d. 1.2 Not est’d. Not est’d. 8.62 1 98 10.6 TABLE NO T.—INDIANAPOLIS WATER. PARTS PER 100,000. Indianapolis Water Works Co. and. of White River. 3 TABLE NO. II.—AVERAGE COMPOSITION OF VARIOUS WATERS. PARTS PER 100,000. Description. y Total Solid Matter. *3 O a 3 Nitric Acid Anhyd. N2 05. Chlorine. IC1). Temporarv. K ► w Permanent. § M s. 3 o H Number of Samples Analyzed. 2.95 .029 .011 .22 .37 39 0.47 .005 Not Not 1 estim d estim d Upland Surface Water. From Non - Calcareous Strata. From igneous rocks 5.15 .001 .007 1.13 . l 2.5 2.6 18 From Metamorphic, Cambrian, Silurian and Devonian Rocks 5.12 .002 .023 .92 .0 3.12 3.12 81 From Yoredale and Millstone Grits and the Coal Measures 8.75 .001 .038 1.05 .43 5.37 5.8 47 From Lower London Tertiaries and Bag- shot Beds. 8.40 .004 .026 2. 06 .33 4.37 4.7 3 From Calcareous Strata. From Calcareous portions of Silurian and Devonian Rocks.... 13.71 .0 .080 1.20 1.45 9.25 10.7 3 From Mountain Limestone 17.07 .001 .042 1.24 7.05 8. 75 15.8 7 From Calcareous portions of Coal Meas ures 22.79 .0 3 .061 1.52 4.93 10.37 15.3 26 From the Lias, New Red Sandstone, Con- glomerate Sandstone and Magnesian Limestone 18.80 .002 .038 1.49 9.48 8.12 17.6 9 From the Oolites 17.46 .004 1.55 8.25 7.25 15.5 1 Deep Well Water. In Devonian Rocks and Millstone Grit 32.68 .044 1.131 2.70 10.95 10.75 21.7 7 In the Coal Measures 83.10 .005 .796 18.05 18..85 25.75 44.6 9 In Magnesian Limestone 61.14 .0 1.640 4.31 21.1 33.6 54.7 3 In New Red Sandstone 30.63' .003 2. 760 2.91 9.2 13.1 22.3 28 In the Oolites 33. GO .022 2.406 2.69 17.2 8.5 25.7 5 In the Lias 70.98 .001 1.497 4.42 27.4 10.2 37.6 2 In the Hastings Sands, Greensands and Weald Clay 45.20 .016 .754 5.38 21.0 13..1 34.1 20 In the Chalk 36.88 .001 2.348 2.76 26.5 8.1 34.6 66 In the Chalk below London Clay 78.09 .048 .361 15.02 12.2 10.8 23.0 13 In Thanet Sand and Drift 53.84 .072 .446 6.32 18.0 9.5 27.5 4 Spring Water. From Granite and Gneiss Rocks 5.94 .001 .418 1.69 .5 3.2 3 7 8 From Silurian Rocks 12.33 .001 .685 1.84 1.9 6.6 8.5 15 From Devonian Rocks and Old Red Sand- stone 25.06 .001 2.941 3.85 6.0 9. 15. 22 From Mountain Limestone 32.06 .001 .862 4 63 13.6 11.1 24.7 15 4 Report and Analyses of the Waters of the TABLE NO. II.-AVERAGE COMPOSITION OF VARIOUS WATERS. Continued. PARTS PER 100,000. Description. Total Solid Matter. Ammonia. Nitric Acid Anhyd. ( N2 Ob ) Chlorine. (Cl). Hardness. Number of Samples Analyzed. Temporary. Permanent. Total. From Yoredale and Millstone Grits and • the Coal Measures 21.91 .001 1.513 1.85 6.5 9.8 16.3 22 From Magnesian Limestone 66.52 .002 2.64 3.40 31.1 43.5 74.6 1 From New Red Sandstone 28.69 .001 1.270 2.19 10.2 13.3 23.5 15 From the Lias ... 36.41 .001 1.797 2.48 26.6 11. 37.6 7 From the Oolites 30.33 .001 1.547 1.55 22.8 7.7 30.5 35 From the Hastings Sand and the Green- sands 30.05 .0 1.255 2.98 17.0 8.2 25.2 19 . From the Chalk 29.84 .001 1.470 2.45 22.7 6.8 29.5 30 From the Fluvio-marine Drift and Giavel 61.32 .001 1.361 2.76 22.5 24.5 47. 10' London Water Supply. Average of monthly analyses during ten years, 1868-1877. 28.03 .0006 . 808 1. 73 25.5 600 41.14 . 0002 1.640 2.43 35.1 120 Birmingham Water Supply. Average of monthly analyses, 1876-1878... 25.67 .002 .823 1.69 19.8 36 Glasgow Supply from Loch Katrine. Average of monthly analyses, March, 1877, 2.96 0 .015 .067 1.8 12 SuSPEl tDED Matter. *2 Sh fl 6 a 2 Sewage. § o H Fresh sewage; average from 16 water- closet towns 72.2 6. 703 .011 10.66 24.18 20.51 44. 69 50 Fresh sewerage; average from 16 midden towns 82.4 5.435 pstim c 11.54 17.81 21.30 39.11 37 Indianapolis Water Works Co. and of White River. 5 Rivers. © Is A S 3 CO 3 © H © o5 o Nitric Acid Anhyd. Ns 06 03 0 |» a < '1 Organic matter. So A c3 1-1 O Magnesia. Mg O. c N w Chemist. 33.3 5.84 .33 11. 7 2.5 1.52 A Aug., 1875 27.6 5. 46 .0 3.39 4.77 1 3 Wibel. Dec., 1875 27.5 2.03 .05 13. 6 4 54 6.6 .35 .05 . 94 1 13 0 49 Oct., 1870 25. 0 . 25 5. 2 7 49 . Vohl. Nov., 1870 16.0 .99 6.4 3.58 0 43 Jan., 1871 24.5 .37 .36 8. 9J 2. 43 July, 1872 24.5 .62 . ii 4. 01 8. 96 1.91 1.17 Reichardt. April,1873 12.5 .92 .2 . 93 1.8 0 36 .23 The Saale, at Jena May, 1873.... 8.0 .97 ,19 Not est’d. 3.88 3.36 0. 73 .43 « May, 1873 15.0 1.07 .22 2.19 3. 64 1. 08 .52 it , 1872 11.8 .99 4. 1 Chandler. 9.8 .95 3.1 11.7 .63 .21 10.8 3.16 0. 78 4.2 Van Nuys. The Ohio, at Evansville Sept., 1880 18 6 .9 .33 .012 10.98 4.3 1.2 4.9 TABLE NO. III.—RIVER WATER. PARTS PER 100,000. 6 Report and Analyses of the Waters of the There is no method of estimating the exact quantity of organic matter in water. I employed the method of Schultze,* by which the quantity of oxygen is ascer- tained which combines with the organic matter in the water. For this purpose a solution of potassium permanganate of a certain strength is employed. It was suggested by an English chemist, Woods, that by multiplying the quantity of potassium permanganate, which is deoxodized by the organic matter by fire, or the quantity of oxygen liberated by twenty, the result would approximate the quantity of organic matter in the water. This method is employed in Germany and France almost to the exclusion of all others. Many of the English chemists, however, employ Frankland’fe and Armstrong’s method by which the carbon, hydrogen and nitrogen of the organic matter are estimated. The quantity of organic matter found by this method is in every case too low, as volatile bodies pass off during the evaporation of the water. There are other objections to the employment of this method which can not be here considered.f To ascertain the relative quantity of the volatile organic matter in water of the Water Works sample, No. 3, I put 500 cubic centimetres of the water into a glass stoppered retort, having its neck directed slightly upward, the end bent downward, and connected with a Liebig’s condenser, 300 cubic centimetres were distilled over in equal quantities. The first distillate 100 c. c. required 0.0005719 grm. K Mn 04 to oxidize the organic matter. The second distillate 100 c. c. required 0.0004454 grm. K Mn 04 to oxodize the organic matter. The third distillate 100 c. c. required 0.0003855 grm. K Mn O4 to oxidize the organic matter. The ratios of the quantity of volatile organie matter in each distillate to 100 cubic centimetres of the water were— First, 0.5 to 1. Second, 0 4 to 1. Third, 0.3 to 1. This method of estimating the quantity of the volatile organic matter in water was lately proposed by Tiemann and Preusse,J but, as yet, it has been so estimated in very few cases; however, I found the ratios of the volatile organic matter to the total quantity by this method in water from the Ohio river, above Louisville, as follows: First, 0.3 to 1. Second, 0.24 to 1. Third, 0.21 to 1. And water taken from the river, above Evansville, yielded the following ratios : First, 0.34 to 1. Second, 0.28 to 1. Third, 0.24 to 1. And the first distillate of the water from one of the wells of the Indiana Reformatory Institution for Women, yielded the ratio 0.3 to 1 in this water. The ♦Dingler’s Journal 180-204. fjournal of the Chemical Society, II, vol. 6, p. 152. JBericlite der Deutsch. Chem. Gesellschaft, B. 12,1900. Indianapolis Water Works Co. and of White River. 7 other distillates were obtained under different conditions.* From these results, as far as a single analysis extends, Water No. 3, of Table I, contained more volatile organic matter than any of the water examined by this method. The method employed in estimating ammonia was by use of Nessler’s Reagent. Nitric acid was estimated by the method of Schloesing, modified by Keichardt and Tiemann.t The several samples of water were tested with meta-phenylenediamine (melting point 63° C ) for nitrous acid, but as the quantities found were very little greater than in rain-water exact estimations were not made. The lime and mag- nesia were estimated gravimetrically in all the numbers except Nos. 4, 6, 8, 10 and 11; in these the lime and its equivalent of magnesia were estimated by the use of a standard solution of soap. The degrees of hardness as given in the tables are German, that is one part of lime CaO by weight, or its equivalent of magnesia MgO, in 100,000 parts of water is known as one degree of hardness. The permanent degrees of hardness represent the lime and magnesia in the form of sulphates and chlorides, and hence are not precipitated by boiling the water. The relationship between the degrees of hardness adopted by Germany, England and France, are represented thus : 10 degrees of Germany equal 8 degrees of England, or 5 6 degrees of France. MICROSCOPIC EXAMINATION. I made a microscopic examination of several samples of water of the City Water Works, particularly Nos. 1, 2 and 3, and found numerous monads, rotifers, navicula, lanceolata, and various other infusoria. I did not find any bacteria. The samples of water of the Water Works, which were comparatively clear, deposited, after standing twenty-four hours, loose, floculent bodies, in which, by microscopic exam- ination, various infusoria were found, and the floculent mass appeared partially organized, therefore, of animal or vegetable origin. It was for this reason that the suspended matter or sediment of the water of the Water Works, in some cases, was not estimated, as the division of the same after shaking the water was not perfect; however, to ascertain to a certain extent the quantity of the organic matter of these flakes in No. 5, the water, in a bottle of 965 cubic centimetres capacity, after the elapse of three days, was decanted off, except a small quantity containing the dark colored flakes; this was washed into a 250 cubic centimetre flask with the decanted water and filled to the mark. The quantity of organic matter was in- creased by these flakes from 3.63 to 10.19 per 100,000. parts of the water. In order that the constitution of the water furnished by the Water Works Com- pany, and that of White river, may be understood, I have introduced table No. II, showing the difference in constitution of water from various sources. These tables are from Frankland’s Water Analysis. I have, however, changed the English into German degrees of hardness, and the “ nitrogen, as nitrates and nitrites,” is here given as nitric acid anhyd. N205. By examination of these analyses the fact that water varies greatly in constitution, according to its source, is at once perceived. Table No. Ill gives the analyses of the water of a few rivers ; in this table the fact that river water varies in constitution at different times and places is illus- trated. * American Practitioner, June, 1880. fZeitschrift, f. Analyt. Chemie. 9-24, und Berichte der Deutschen Chem. Gesellschaft VI, 1041. 8 Report and Analyses of the Waters of the By examination of these tables it will be observed that not all the solids of each water are estimated. To determine the quality of water for drinking purposes the bodies enumerated in the tables are the only ones required. In a sanitary analysis of water the estimation of lime and magnesia may be omitted, but I Have estimated them, or determined the degrees of hardness, as this property of water is taken into account in the employment of water for technical purposes. Some of the bodies named in the tables are by no means injurious to health; the water of many mineral springs owe their curative propensities to the quantity of chlorides they contain, but the quantity of chlorine, for example, in river or well water serves as an index to its impregnation with sewage, contents of privy vaults, or the refuse of slaughter-houses, as these contain chlorides in considerable quantity. If the nitric acid or ammonia found in water in far greater quantity than is present in good water, it is not that these bodies are poisonous in such quantities that the water may properly be considered suspicious, but that they are the last products of the decomposition of organic bodies containing nitrogen, and, therefore, if the water contains no excess of organic matter they serve as an indication that, at a previous time, the water was rich in organic matter, which has been decomposed. Not all the nitrogen, however, of organic matter passes ultimately into nitric acid and ammonia, for the experiments of Keiset and Gilbert show conclusively that in the presence of alkaline carbonates about forty per cent, of nitrogen passes off free. Organic matter is sometimes found in great quantity, and nitric acid or ammonia in mere traces. This condition may be caused, first, by organic matter not being advanced in decomposition ; second, when the organic matter is vegetable in kind, and therefore not containing much nitrogen as a constituent; third, if water has been in contact with growing vegetables, the nitrogen of the nitric acid and ammonia may have been absorbed by them. When urine, faeces and sewage pass into the soil, the organic constituents of them readily decompose by oxidation in the presence of low animal organizisms. Or- ganic matter in all stages of decomposition—ammonium and potassium, phosphates and carbonates—are retained by the soil from solution, to a great extent; while the chlorides and nitrates of sodium, calcium and magnesium are not readily retained by the soil, but a solution of them passes into wells. Soil has not the property of retaining a great amount of organic matter and ammonia, and when it has become saturated, they, like the nitrates and chlorides held in solution, pass into wells; and hence the water in springs away from towns or villages is generally the best water for drinking purposes. When soil has become saturated with organic mat- ter, there is deficiency of oxygen in the soil, and in* consequence decomposition takes place slowly, and organic matter will be found in the water of the wells a very great length of time, and the precaution of cementing privy vaults would not qring about an immediate improvement of the water of the wells in the vicinity. That not all soils have the same power of absorbing these bodies was proven by the experiments on the filtration of sewage by the Rivers Pollution Commissioners of England. The inorganic salts in water, which is at least suspicious, are not in- jurious to health, as the quantities of them in water are not sufficient to produce any effects; those of them which would, perhaps, produce an effect in great quan- tity are the nitrates and magnesium compounds, but they are comparatively in very small quantity, even in highly polluted water. There is no evidence that the death Indianapolis Water Works Co. and of White River. 9 rate is any greater in localities where hard water is used. To determine if water is good for drinking purposes, attention must be directed principally to the quantity of organic matter it contains, and to the microscopic examination. The quantities of chlorine, nitric acid, ammonia and solids must be taken into account, as they afford evidence of the contamination of the water. So far the determination of the quality and exact quantity of the different solid products of the decomposition of animal and vegetable materials in water is im- possible. There is, doubtless, a great number of them in polluted water, differing in kind in different waters. The decomposition of organic matter in water is greatly facilitated by the presence of living organisms—in fact, they are the prin- cipal agents in reducing complicated molecules of organic matter. That the products of the decomposition of organic matter ever produce specific diseases is not probable, as no chemical compound is known which is capable of giving rise to a specific disease; those which have any effect at all give rise to gen- eral disorders of the nervous or nutritive system, known as toxic effects. If the question of the infection of impure water turns on the presence of living organisms, then why have not the greater number of waters of the earth become infected with the virus of typhoid fever, small-pox, cholera and other contagious diseases? Water found in nature perfectly free of some forms of animal or vegetable life is comparatively rare. Water containing organic matter forms a nidus for the de- velopment and proliferation of infusorial organisms of multitudinous forms. The germs or spores of these organisms are in the atmosphere, as shown by the re- searches of Pasteur, Cohrfn and others. Subject a weak solution of albumen and a small quantity of soluble phosphate to the action of air at ordinary temperatures, organisms will be found in the fluid similar or identical in kind to those found in sewage or contents of privy vaults * Water is an excellent solvent, and when it comes in contact with vegetable or animal matter, it takes some of it in solution, and hence water containing matter of animal or vegetable origin may be found where it would generally be supposed pure; for example, water of some deep wells, as those of Hamburg and Hanover, and from glaciers. The theory that impure water often becomes infected by the special virus of disease is generally accepted. The Rivers Pollution Commissioners of England devote forty-four pages in their sixth report to prove that the conta- gion of certain diseases is propogated by means of impure water. By a critical examination of the literature of this subject, it becomes evident that nine-tenths of the researches which have been made, or the conclusions drawn from them, do not have a true scientific basis. It is a very easy matter to assume that typhoid fever originated from water from a certain source, and it is still easier to connect cases by hypothetical links so as to form a whole chain of “evidence ” On the other hand, evidence that impure water generally does not become infected with the poisons of contagious diseases is not often brought to light. Many cities furnished with impure water are not, as a rule, visited by epidemics to a greater ex- tent than those using a better quality of water. Before the establishment of the water works at Halle, Germany, well water was used for drinking purposes which *Berichte der Deut. Chem. Gessellschaft IV, 170. 10 Report and Analyses of the Waters of the was polluted,-* and the wells of Hamburg likewise furnish impure water. In this country the cities of Cincinnati, Louisville and Evansville are supplied with Ohio river water without filtration, yet in consequence we are not aware that these cities have been the abode of contagious diseases. Of 1,417 cases of typhoid fever treated in the Leipsic hospital in the space of twenty-four years, the majority originated in the parts of the city supplied with the best water.! A quantity of organic mat- ter, nitric acid and chlorine found in water greater than is contained in the water of springs situated a distance from towns or other sources of organic impurity, prove beyond a doubt that the water contains sewage or soakage which deserves great attention. As the result of great experience in the examination of water from various sources, certain chemists have proposed the maximum quantity of each of these bodies which good water may contain. These limiting numbers, stand- ards, or grenzzahlen, are here given. The numbers represent parts in 100,000 parts of water. Chemist. Residue or Solids. Organic M atter. Nitric Acid Anhyd. Chlorine. Hardness. Total. E. Reichardt 50 2. 0 4 0.2-0.8 18 Kubel and Tiemann 50 5 0.5-1.5 2.-3. 18-20 F. Wibel 50 5 0.5-2 3.5 18-20 F. Fischer 50 4. 2.7 3.5 17 M. Pettenkoffer 5. The Rivers Pollution Commissioners of England, appointed to investigate the subject of potable waters in general, and the water supply of London in particular, give as the result of their researches in their Sixth Report, 1868, a series of conclu- sions, some of which are as follows: 1. Any liquid which has not been subjected to perfect rest in subsidence ponds of sufficient size for a period of at least six hours, or which, having been so sub- jected to subsidence, contains in suspension more than one part by weight of dry organic matter in 100,000 parts by weight of the liquid ; or which, not having been so subjected to subsidence, contains in suspension more than three parts by weight of dry mineral matter, or one part by weight of dry organic matter, in 100,000 parts by weight of the liquid. 2. Any liquid which shall exhibit by daylight a distinct color when a stratum of it one inch is placed in a white porcelain or earthenware dish. 3. Any liquid which contains more than one part chlorine in 100,000 parts. The Vienna Water Commissioners, appointed to investigate into the water supply of the city of Vienna, came to certain conclusions regarding healthy (gesundes) water, as the result of their investigations. A translation of some of these from their report, made in 1864, is here given : *Stohmann Muspratt’s Tech. Chem. , B. 4, S. 1746. fFluegge Zeitschrift, Biologie 13-502 Indianapolis Water Works Co. and of White River. 11 1. Water must be clear, sparkling and colorless. 2. It must contain but a small quantity of solid materials and be entirely free- of organized matter (infusoria.) 3. Of the alkaline earths (CaO, MgO), it must not contain more than 18 parts- by weight in 100 000 parts by weight of the water. 4. It must contain but a small fractional part by weight of soluble salts, par- ticularly the sulphates and nitrates. 5. The solids held in solution and the temperature of the water must vary within very narrow limits during the year. 6. It must be protected from contamination. 7. The above requirements are fulfilled in many cases by soft spring water, which alone is shitable for drinking purposes. 8. The industries require water having nearly the same properties. 9. Filtered river water, if at all times free of turbidity, will answer for technical purposes, but, on account of not fulfilling requirements 5 and 6, is not fit for drink- ing purposes. 10. To sprinkle or clean streets any water is suitable, providing it is odorless and does not contain a great amount of offensive materials. THE WATER OF THE CITY WATER WORKS COMPANY FOR DRINK- ING PURPOSES. Notwithstanding it is very doubtful if impure water ever becomes infected with the germs of disease, yet by the chemical and microscopic examination of water there can remain no doubt in regard to its purity or contamination and the proper course to pursue. To determine the quality of the water supplied by the Water Company it was desirable to ascertain, first, the quantity of the organic matter,, chlorine, nitrates, etc., in the water of the well of the Water Works, or that drawn from the mains; second, the quantity of the above named substances in the water of the river near the Water Works; and, third, if the water of the river, near the Water Works, is similar in constitution to that above the city. If we take cognizance of the proposed limiting numbers we must conclude that the water of the Water Works is suspicious. This is-at once seen by examination of Table No. IV: 12 Report and Analyses of the Waters of the TABLE No. IY. No. of Analyses. Chemists. Solids dried at 180° C. Chlorine. rO G < i rs o O