Director of Hygienic Institute, Munich. Jaros Hygienic Wear 
THE THERAPEUTIC AND PROPHYLACTIC 
APPLICATION. 
BY 
I. JflROS. 
WITH ILLUSTRATIONS. 
NEW YORK: 
Jaros Hygienic Underwear Co., 
52 EAST ioth STREET. COPYRIGHTED 
BY 
THE JAROS HYGIENIC UNDERWEAR CO. 
1890. FOURTH EDITION. 
To the learned gentlemen of the 
7V\,edieal Profession. 
The comments herein given on the value of the 
“Jaros Hygienic Underwear” are acknowledgments 
on the practical accomplishment of scientific theories. 
Prof. Mattieu Williams remarks : 
“ They present an interesting instance of how 
a logical effort to apply pure science to practical 
business may react in such a manner, that practical 
business shall become a beneficent contributor to pure 
science.” 
I tender thanks for the kind expressions herein 
embodied, all of which are given with due regard 
for the ethics of the profession. 
Yours, 
New York, 1890. 6 
Professors Von Pettenkofer, Parkes, and Buck, 
pronounced Hygienists, have contributed largely to 
establishing theories regarding clothing materials and 
their relations to health. These conclusions have led 
to a more general consideration thereof, in the thera- 
peutics, as well as prophylaxis in medical practice. 
Wool is regarded as deserving first consideration. 
MAGNIFIED—WOOL FIBRE. 
The fibres are cylindrical collections of numerous 
cells, and present each the appearance of a tube cov- 
ered with epidermic scales which overlap each other. 
'1 he zigzag markings are characteristic. 
Cotton, for various reasons, may be regarded as 
next in importance, providing consideration be given to 
the manner of application, in combination with wool. 
1 his is fully verified by Krieger’s experiments. 7 
MAGNIFIED—COTTON FIBRE. 
SECTION SAME—COTTON FIBRE. 
The fibres of cotton appear to be made up of flat, 
ribbon-shaped cells, thicker at the edges than in the 
middle. They are irregularly twisted, with a broad 
longitudinal cavity more or less well defined. There 
is frequently a kind of net-work striation apparent on 
the surface. 
With regard to the comparative value of these 
fibres in application we refer here to the Tables of 
Mattieu Williams, page 31 of this Treatise. It remains, 
therefore, to have a material of these fibres so con- 
structed that it will embody all scientific essentials. 
The first satisfactory material of the “ Jaros Hygienic 
Wear” was laid before the Medical Profession in Chi- 
cago, November, 1884, and, guided by their sugges- 
tions, the “Wool Fleece Fabric” was so materially 
improved that, on January 4,1886, L. L. McArthur, M. D., 
in a paper before the Chicago Medical Society, states : 
“Now, gentlemen, this device was a particularly 
‘happy one/ in that all the requirements of a truly 8 
hygienic wear are provided—porosity, warmth, 
absorbent powers and elasticity.” 
JAROS HYGIENIC MATERIAL MAGNIFIED. 
It will be seen that the material is a fleecy wool 
surface knitted into a cotton framework—resembling 
in many essential points a natural sheep’s pelt. A 
prominent factor regarded in the claim for a-reproduc- 
tion of the natural pelt, is the preservation of the yolk 9 
THE YOLK, 
which, if left in the wool, preserves its pliancy. It forms 
a kind of natural soap, consisting principally of potash 
salts with animal oil almost entirely soluble in cold 
water. Special care must therefore be taken in washing 
the wool, and this has been one of the latest results 
added to the success of the “ Jaros Hygienic Material.” 
The features warranting precaution in scouring wool, 
and advised by scientists, are based on the following pos- 
sibilities : Excess of alkali has to be guarded against, 
since uncombined caustic acts energetically on the 
wool fibre, and is indeed a solvent of it. On this 
account soap solutions cannot be too carefully pre- 
pared to prevent making the wool brittle. 
“A material of loose texture confining much air in 
its interstices is warmer than same amount of clothing 
material closely woven. Wool or cotton carded and 
spread out in the shape of a wadding and held, will 
make a warmer garment than the same quantity spun 
and woven, and similarly covered. This applies with 
force to underclothing.”—“Ziemsen,” Vol. XVIII. 
PROPHYLAXIS.—In th£* consideration of a pro- 
phylactic measure this Underwear accomplishes the 
desideratum for protection. 10 
L. D. Rogers,rA.M./M.D., in a paper, states: 
A fabric, therefore, so constructed as to allow a layer of 
woolen fibre to lie between the skin and a layer of cot- 
ton fibre, and sufficiently open and loose as to contain 
the largest possible amount of air is the ideal. The 
faros Hygienic Underwear material, a new fabric, 
seems beautifully adapted to this end. A layer op 
woolen fbres, soft and fleecy, is firmly held on one side 
of and in the meshes of an exceeding porous cotton 
fabrict so that while one extremity of a fibre lies 
against the skin, the other is in contact with the cotton/ 
thus admitting of the rapid transference of all damp- 
ness of perspiration to the cotton where it is retained, 
and consequently leaving no moisture next to the skin 
to absorb and diminish the heat of the body. The 
importance of this subject, and the possibilities of this 
new fabric for the prevention of colds, and their 
resultant diseases, can only be appreciated when we 
remember the simple fact that it is impossible to take 
a cold so long as a healthy condition of the skin, and 
an even temperature of the surface of the body, are 
maintained. 11 
REPORT OP C. B. HOLMES, 
President Chicago City Railway Company. 
“The Jaros Hygienic Underwear” has been in use with Conductors and 
Gripmen of this Company since November, 1885, having been recommended by 
theCompany’s Surgeon, Dr. T). A. K. Steele. We speak for the men in asserting 
that this underwear is considered the best possible protection against cold and 
changeable temperatures, which are especially characteristic of this latitude, 
and its use has resulted in great protection of health and a corresponding in- 
creased efficiency. With conductors, whose occupation necessarily prevents the 
wearing of a very heavy overcoat, it is of great advantage, and gripmen and 
drivers are enabled to thoroughly protect themselves in their exposed positions 
without an overplus of clothing, otherwise necessary.” 
These citations might be continued at great length, covering Keports of 
Police and Eire Departments in our large cities, and from many Bailway Corpor- 
ations and Physicians. 
THERAPEUTICS.—In the Therapeutics of Medi- 
cine the Underwear is regarded as specially indicated 
in Rheumatism, Kidney Disease (Bright’s), and Pul- 
monary Consumption. 
RHEUMATISM. 
J. NEVTNS HYDE, A. M., M. D., gives expression as follows: 
“ I have often employed the “ Jaros Hygienic Underwear” in cases of muscu- 
lar and other forms of rheumatism, and always with advantage to the patient. 
I have had knowledge of these undergarments sufficiently long to justify me in 
stating very positively that I regard them as a valuable means of protecting the 
surface of the body from the climatic changes to which it is much* exposed.” 
DAVID WABMAN, M. D. 
“ One of my patients wearing the ‘‘Jar os Hygienic Underwear ” is a sufferer 
from muscular rheumatism, and since he donned the garments he has not had 
an attack, although the weather has just been of the kind to produce the disease.” 12 
KIDNEY DISEASE. 
BRIGHT’S DISEASE AND ALLIED AFFECTIONS OF THE KIDNEYS. 
By CHARLES W. PURDY, M.D., Prof, of Genito-Urinary and Renal Diseases in 
the Chicago Polyclinic. 
Chapter 1 —Albuminuria.—Pages 64-65. 
“ The Skin.—* * * The most thorough protection to the skin is 
secured by the use of the Jaros Hygienic Wear, especially during the cold and 
damp season. * * * It will be seen that the cotton fabric secures a com- 
paratively static condition of air next the skin, while the fleece wool combines 
the minimum radiation of heat from the body with the greatest attainable hy- 
groscopic power, thus securing uniform dryness and warmth of the skin under 
various conditions of atmosphere. Dr. L. L. McArthur has demonstrated be- 
fore the Chicago Medical Society the superiority of the Jaros Wear over all 
other fabrics for the purpose of protecting the skin against rapid changes of 
temperature and humidity, and my own experience with it altogether bears out 
his deduction.” 
DR. I. N. DANFORTH, in January, 1886, states: 
‘‘ I am much impressed with the value of the " Jaros Hygienic Wear,” espe- 
cially in renal and other diseases in which sudden changes of body temperature 
are hazardous. I think it will prove a valuable addition to eyir means of treat- 
ing chronic, renal and other diseases in which full protection of the skin is all 
important.” 
PULMONARY CONSUMPTION. 
J. W. PRICE, M. D. 
ADDRESS BEFORE ELMIRA ACADEMY OF MEDICINE, JULY, 1887. 
Curability and Treatment of Pulmonary Consumption. 
“ The dress of the consumptive patient should be adapted to equalize the 
temperature of the body, so loose that it interferes in no way with the natural 
functions. The underclothing should be woolen, either lamb’s wool or flannel. 
After an extended observation of the benefits derived from -wearing the “ Jaros 
Hygienic Underclothing,”—a wool fleece knit material of graded weights, 
adapted to the season, I believe it to be the best protective device yet known 
for these patients. 
“ They are excellent non-conductors of changes of the temperature, and at 
the same time absorb cutaneous moisture—two most important qualities.” 
Added to these statements are many more in this 
Treatise. 13 
Properly fitting garments are advised, and as an illus- 
tration of the results achieved, exact reproductions 
from life are given. The manner and style adopted, 
is in keeping with all other features accomplished. 
The matter of detail has been sufficiently thorough 
to embody also the point of seaming. 
SEAM. 
A special seam is used to overcome objections 
which caused discomfort and irritation. This seam is 
flat, soft, and lends to the garments the appearance of 
seamless wear, to which is added the perfect fit only 
reached in cut and sewed underwear. 
WOMEN S COMBINATION SUIT. 14 
mens’ suit. 
CONCLUSION. 
In the summary of the results of practice with 
the “Jaros Hygienic Underwear” byU. S. Army Posts, 
U. S. Navy Pay Inspector’s Department, Police and 
Fire Departments, Railway Companies, etc., etc., all 
scientific recommendations find verification. 
Continuing the work of research and experiment, 
the aim is to aid the Profession in gaining the results 
desired with an ideal in clothing material. 
CAUTION.—The success of the “ Jaros Plygienic 
Wear,” and the recognition earned, has prescribed ut- 
most care in properly stamping the Wear to protect 
the Profession against possible misrepresentations. 15 
Below is Trade-Mark. 
'•Registered Pat. Nos. 16060,16166.’*.  gLotHing. 
By L. L. McArthur, M. D. 
Treasurer Medico-Legal Society, Chicago; Attending Physician Michael 
Riess and Mercy Hospitals, Chicago. 
Abstract cf a paper read before the Chicago Medical Society on J nuary 4, 1S86.J 
The object of clothing should be the promotion and 
•maintenance of good health, together with a feeling of 
well-being under all atmospheric conditions. 
Consideration of the subject naturally sub-divides 
itself into : 
I. Materials. 
II. Texture. 
III. Form of clothing. 
Chief among the materials used for clothing in the 
order of their respective merits are linen, cotton, silk, 
and wool, the latter being the best. 
A few words as to these materials in the raw state : 
Linen conducts heat better than cotton, silk or wool. 
It absorbs moisture and does not shrink. Cotton, also 
a vegetable fibre, which is hard, durable and does not 
shrink, has serious objections, in that it is very non- 
absorbent of moisture. It does not conduct heat as well 
as linen, but more rapidly than silk or wool. 
Silk, an animal product, consisting of fine, smooth McArthur—Hygienic Clothing. 
17 
round fibrillae, having been in the liquid condition before 
leaving the body of the silkworm, possesses no central 
canal, and no oily coating. It is quite a good absorbent 
of moisture, ranking next to wool. At ordinary tem- 
perature it always contains between 9 and 12 per centum 
of moisture. In its sale or purchase, account is taken 
of the amount of moisture in order to protect the pur- 
chaser from paying silk prices for water. 
Wool, the fleece of sheep, an animal fibre, whose 
function in nature has been two-fold, the protection 
from cold, and an aid to evaporation of cutaneous mois- 
ture, is admirably fitted as a material for clothing. It 
permits but slow radiation of heat, and absorbs moisture 
better than any other clothing material. It does this, 
according to Parkes, in two ways : 1st. By interposi- 
tion between the fibres. 2d. By penetration into the 
central canal. His experiments led him to believe its 
hydroscopic powers double in proportion to its weight 
and quadruple for surface, as compared with cotton or 
linen. Perfectly dried wool has the power of absorbing 
50 per centum, by weight, of water. Under ordinary 
conditions it contains 12 to 18 per centum. 
Other things being equal, then woolen fabrics will 
best prevent too rapid radiation of heat; silk next, cotton 
third, linen fourth. 
Wash-leather, buckskin and chamois-skin need not 
be considered, for one or all of the following reasons: 
Expense, poor provision for evaporation, poor washing 
qualities. 18 
McArthur—Hygienic Clothing. 
As absorbers of moisture, rank, respectively: wool, 
silk, linen and cotton. 
The advantages of cotton over wool lie in its cheap- 
ness and non-shrinking qualities. If properly con- 
structed, however, the advantageous properties of wool 
can be utilized without the shrinking by using a cot- 
ton f ramework, into the ?ncshes of which the loose, raw 
feece is worked. 
That fabric will be best adapted for health, which 
combined with greatest porosity, possesses the least (a) 
conductivity, (b) greatest hydroscopic power, and (c) 
best shape. 
By porosity is understood the freedom with which 
air can pass through the interstices of a fabric. Petten- 
koffer’s practical demonstrations with the following 
cloths, shows that if heavy flannel be taken as permitting 
100 parts of air to pass, linen permitted 60.3 or 60 per 
centum; lambskin 50.7 or 50.7 per centum; silk fabric, 
heavy, 14.4 or 14.4 per centum; glove-leather 1.5 or 1.5 
per centum. 
The conclusion follows that porosity does not injure 
the powers of preventing radiation (it even increases 
it) for flannel, admittedly the warmest clothing, permits 
the freest circulation of air. 
In consequence of the fact of a fabric’s possessing 
great porosity, it contains in its interstices what might 
be called “ residual air.” Whether gases possess con- 
ductivity is open to discussion, but this is certain, that 
such power is very small. Could we by any means en- McArthur—Hygienic Clothing. 
19 
velop the body in a layer of stationary air, we could 
reduce the heat-loss to a minimum. A striking example 
of the poor conductivity of stationary air is related by 
Dr. Kane, the Arctic explorer, who found that on per- 
fectly still days they could withstand, without suffering, 
a temperature of —70 F.,* with ears and hands exposed, 
but the moment a breeze sprung up it became necessary 
to seek immediate shelter. 
Although impossible to perfectly accomplish this, 
(i. e., the surrounding of body in a stationary envelope 
of air), that cloth or fabric which most nearly approxi- 
mates this, other things being equal, will prove itself 
the warmest as well as best adapted for evaporation of 
cutaneous moisture. Such a nearly stationary air occurs 
naturally in the various pelts, and although in many the 
integument is visible beneath, yet they can withstand 
the most rigorous weather. Thus Krieger’s experi- 
ments with tin cylinders containing hot water with two 
coverings of different materials, between which an 
interval of to yx inch was left, proved (after subtract- 
ing the amount due for conduction) the impediment to 
radiation by the second layer to be, viz; linen, 32; silk, 
32; flannel, 29. 
Thus showing that the stationary air, rather than 
the material out of which the second layer was made, 
was the main factor in preventing radiation. 
He then experimented with single and double layers 
of the same material surrounding these cylinders, ob- 
taining the following instructive results; the numbers 
*70° F. below Zero. 20 
McArthur—Hygienic Clothing. 
representing the proportionate loss of heat through 
double to single layers, the losses through the single 
ones being taken at 100: 
Double Stuff, (“ Doppel Stoff ”) Fleece-lined cotton. 
.69- 
-76 
Buck-skin 
•74- 
-86 
Flannel 
86 
Home-spun linen 
91 
Stout, extra heavy silk 
94 
From these results the conclusion is obvious that the 
substance and its weight are of less consequence, where 
radiation is in question, than its texture and volume. 
Believing that the explanation was due to the “ residual 
air,” experiments have been made with loose wadding, 
noting the rapidity of fall of temperature, on com- 
pressing the same wadding, when the fall was far more 
rapid. 
Again, the loss of heat through a rabbit’s fur being 
taken as ioo, when shorn of its hair it rose to 190; and 
further destroying its porosity by a coating of gum- 
arabic, it rose to 296. (Diet. Hygiene.) 
By greatest porosity best provision is made for the 
evaporation of perspiration, the quantity of which 
varies greatly under different conditions. In a day of 
rest the amount as determined by Seguin and Voit is 
900 grams (about 1 quart). During exercise it may 
increase to quantities incredible, were the figures not 
furnished by the best of observers. For example: 
Dalton mentions its increase to 380 grams per hour! and 
Dr. Southwood Smith has seen it rise to 1,600 grams 
per hour during violent exercise in a heated atmosphere! McArthur—Hygienic Clothing. 
21 
Now, if a clothing possesses no porosity, e. g., the 
mackintosh, and rubber clothing generally, even with- 
out exercise, there would collect somewhere beneath it a 
quart of water, but if exercise be indulged in, the quan- 
tity may become large indeed; particularly after the 
atmosphere beneath has been surcharged with vapor, 
and evaporation ceases to occur from the surface, and 
with it the grateful cooling process. The French Gov- 
ernment has not permitted its introduction into its army 
for such obvious reasons. Of course, for a short time 
during a shower they may and do prove useful; but I 
am convinced that many have incurred most serious in- 
jury, even death, by throwing off the rubber clothing, 
after the inner clothing had become permeated with 
moisture, when the chilling, incident to the sudden in- 
creased evaporation, has resulted in some acute inflam- 
mation. 
Moreover, the evaporation of the normal cutaneous 
moisture (with that of the lungs) requires 750 heat 
units or one-fifth or all the heat produced in the system. 
(Dalton.) Conservation of part of this loss contributes 
an equivalent amount of force to the organism, since 
heat and force are interchangeable terms. This can be 
done. 
Under normal conditions evaporation of perspiration 
occurs in the “ insensible,” i. e., vapor state, but change 
of these conditions (increased heat, and moisture in the 
atmosphere, increased exercise, etc.,) causes it to collect 
upon the integument in the visible or sensible stated and 22 
McArthur—Hygienic Clothing. 
unless conducted away, may chill the body. Preven- 
tion of such condensation will avoid such dangerous and 
deleterious influences. The cause of condensation is a 
lowering of the temperature. We have simply to main- 
tain its temperature until at a preceptible distance from 
the body. This can be accomplished by a layer of loose 
wool, such as is hereafter described. The “ residual 
air ” having been once raised to the body temperature, 
it remains so, and the vapor docs not assume the liquid 
state until meeting with the chilling influences in the 
outer layer of cloth. 
Finally, bodies passing from the gaseous to the 
liquid state emit the heat—latent heat—which was 
essential to their assuming the gaseous condition. This 
occurring in the case of perspiration in the cloth inter- 
stices increases by just so much their warmth, in other 
words lessens the demand for heat production. 
Before leaving the subject of texture, note should 
be made of the importance of its being of a loose nature. 
However great the hydroscopic power of a material in 
the raw state, if it be tightly woven that power is 
greatly diminished, or even quite destroyed. Hence Hit 
adva?itage of loosely knitted over tightly woven goods. 
Important indeed is the proper fitting of clothing. 
However good the materials they may then not accom- 
plish their purpose for the following reasons: 
I. By close application to the skin certain materials 
acting as cutaneous stimulants, maintaining an active 
equable circulation, Wool possesses this property most McArthur—Hygienic Clothing. 
23 
markedly; even in some delicate skins proving an irri- 
tant. A very marked increase of oily matter is excreted 
over these areas where oil-glands exist in greatest abund- 
ance, i. e., mesial line of thorax, in front and behind; 
thus improving the flexibility of the skin. 
II. By fitting neatly, chambers of air heated by the 
body are not with every change of position of the 
wearer forced out, as occurs in illy-fitting clothing. 
Upward currents of air naturally occur, and if permitted 
to exist carry off large amounts of caloric. Simple 
attention to these two facts reduced the death rate of 
the Wurtemburg Army Corps from 3.22 to 1.64, as com- 
pared with the other departments of the German Army. 
The general application and advantages of such an 
ideal cjothing to diseased conditions, it is needless for 
me to describe to a body of medical men; but particular 
references ought to be made to rheumatism and neph- 
ritis, (“ kidney troubles.”) To the former, because best 
provision is made for cutaneous elimination (always 
acid!) so essential in that disorder, in which there is so 
marked a diminution in the alkalinity of the blood; to 
the latter because sudden congestions are obviated in an 
organ already overworked, by preventing sudden chill- 
ing of the surface. 
It only remains for me to call your attention to my 
accidentally finding such a clothing wpon a patient oj 
mine (Mr. faros), and the tests to which I have fut it. 
He described its history and manufacture as fol~ 
lows ; 24 
McArthur—Hygienic Clothing. 
“ While suffering from an attack of rheumatic 
sciatica in the Harz mountains, following a feasant's 
advice, I enveloped myself in loose lamb's fleece which 
he provided, and I experienced speedy relief. On 
reaching Berlin I consulted Chief Councillor-of- 
Health, Dr. Abarbanell, who advised me to have con- 
structed some underwear with a fleece lining. I sought 
a weaver and had some u?iderwear knitted, into the 
7neshes of which were worked, “ by hand," during the 
process of knitting, layers of loose lamb's wool." 
Now, gentlemen, this device was a particularly 
happy one, in that all the requirements of a truly 
hygienic wear are provided for. 
Porosity, warmth, absorbent powers and elasticity. 
With advice he set to work and perfected a modification 
of the knitting machine which incorporated into the 
meshes of the cloth loose lamb's wool. The samples 
presented speak for themselves as to its success. By 
the use of such a fabric, perspiration (unless excessive 
indeed) remains in the insensible state until it meets 
with the cooling influences externally in the cotton 
framework, the integument remaining dry, while the 
cotton back, as well as the linen shirt over it, may be 
“ wringing wet." Exposure to cold draughts with 
such a suit does not chill the integument because 
the sudden increased evaporation occurs at a distance 
from the skin, and is separated from it by a layer oj 
'wool. 
To test the soundness of the theory I submitted my- McArthur—Hygienic Clothing. 
25 
self to a temperature of iij° F., under as nearly as 
possible the same atmospheric conditions, with the three 
chief winter suitings, and obtained the results in table 
below : 
Jaros Hygienic 
Wear. 
“Nonotuck”Silk 
Suiting, heavy. 
Cartwright 
& Warner’s 
Weight after 
8,020 
7,867 
10,840 
exposure 
7,010 grs. 
7,140 
9,600 
Difference: 
1,010 grs. 
727 grs. 
1,240 
Degree of abso- 
lute dryness of air 
61,827 
77-32 
69.947 
Temp, dry bulb 
therm 
1150 F 
H3° F 
1160 
Temp-, wet bulb 
therm 
9° 
CO 
u> 
0 
O 
00 
00 
Sensation 
Warm but not 
sticky ; outer 
surface damp; 
Cooler than 
other wear; 
sticky; skin 
Sticky, clam- 
my; wet 
through; un- 
skin dry where 
wear touches ; 
comfortable. 
damp ; comfort- 
able. 
comfortable. 
From these experiments it is to be seen, that of all 
the perspiration exuded, the silk retained (by a small 
amount) the least; the hygienic wear the next, and the 
English woolen goods the most. Note, however, must 
be taken of two facts concerning the experiment with 
the silk clothing. 
ist. The temperature was 2° F. lower than when 
testing the hygienic wear, and 8° than the English 
goods. Hence less perspiration was thrown out. 26 
McArthur—Hygienic Clothing. 
2d. There was a difference 0/15.5° of absolute dry- 
ness of the atmosphere, hence evaporation took place 
more rapidly from the silk goods in the dryer atmos- 
phere. The barometer remained almost stationary dur- 
ing the three days of observation. 
On emerging from the hot room into one of a tem- 
perature of 70° E, an immediate chilling was felt with 
the silk goods/ while the English gave a sensation of 
moisture and cold. The chilly sensation was not ex- 
perienced with the woolcndmed hygienic wear. 
CONCLUSIONS. 
1st. That feece-lined goods are warmest. 
2d. Permit at least equal evaporation with the silk. 
5. Guard against sudden chilling of the body. 
4th. Are cheaper than silk and as cheap as Cart- 
wright & Warner's. 
5th. Are particularly indicated in rheumatism arid 
kidney disease. wy of tux mm. 
By Mattieu Williams. 
The following extracts are from the experiments and 
conclusions of Rumford, with supplements by Prof. Mattieu 
Williams,of England. (See “Knowledge,” Nos. 171 to 205, 
“Philosophy of Clothing.”) 
The pnysiological confirmation of these results are 
not quoted ; confining the citations to the qualitive value 
of fibres, especially sheep’s wool, and the possibility of 
materials therefrom that possess the essentials recom- 
mended. 
“The first use of clothing being to keep the wearer 
warm, Rumford’s first inquiry was directed to find the 
best material for this purpose. He saw at once that 
clothing did this by resisting the passage outwards of 
the animal heat. 
He accordingly constructed a model wearer, as 
described in the following experiments: A mercurial 
thermometer, whose bulb was of an inch in 
diameter, and its tube about ten inches long. This was 
suspended in the axis of a cylindrical glass tube about 28 
Mattieu Williams—Philosophy of Clothing. 
three-quarters of an inch in diameter, ending with a 
globe i j60 inch in diameter, in such a manner that the 
center of the thermometer bulb occupied the center of 
the globe, thus leaving a surrounding space to be oc- 
cupied by the material to be examined. The therm- 
ometer tube was graduated with 800 divisions between 
the freezing and boiling points of water—i. e., a 
Reaumur scale divided to tenths of degrees. The 
thermometer was held in its place by a long cork 
stopper. 
He described his method of clothing the bulb as 
follows: The thermometer being taken out of the 
cylindrical tube, about two-thirds of the substance which 
as to be the subject of the experiment is introduced 
into the globe; after which the bulb of the thermometer 
introduced a few inches into the cylinder; and after it, 
the remainder of the substance being placed round 
about the tube of the thermometer: and lastly, the 
thermometer being introduced further into the tube, 
and being brought into its proper place, that part of the 
substance which, being introduced last, remains in the 
cylindrical tube above the bulb of the thermometer, is 
pushed down into the globe, and placed equally round 
the bulb of the thermometer by means of a brass wire, 
which is passed through holes made for that purpose in 
the stopple closing the end of the cylindrical tube. 
The temperature he selected as the starting point 
was 70 degrees Reaumur=iqo degrees Fahr. He Mattieu Williams—Philosophy of Clothing. 
29 
preferred this to the boiling point, as he could obtain it 
accurately by first plunging the whole apparatus duly 
charged into nearly boiling water, then allowing it to 
fall to 70 degrees, and immediately plunging it into a 
mixture of pounded ice and water, where, by the aid of 
a little agitation, it remained steadily at the freezing 
point. 
The*following table shows the results with the sub- 
stances therein mentioned, the quantity in each case 
being 16 grains : 
HEAT LOST. 
HAW SILK AS 
SPUN BY THE 
WORM. 
sheep’s wool. 
COTTON WOOL. 
70° 
.... 
.... 
. . . . 
60 
94" 
79" 
83" 
5° 
110 
95 
95 
40 
*33 
118 
117 
30 
185 
162 
* 52 
20 
273 
238 
221 
10 
489 
426 
378 
Total times.. 
1,284 
1,118 
1,046 
The clothing value or “ warmth ” of these sub- 
stances as thus applied varies directly with these figures, 
representing the passage of heat or their “ non-con- 
ducting” power. 
The experiments described were directed to the 
determination of the relative power of different ma- 
terials. (We have only quoted the substances most 30 
Mattieu Williams—Philosophy of Clothing. 
generally used for clothing purposes.) These were 
followed by another series upon certain given materials 
differently arranged, or in different conditions of density. 
The same “passage thermometer” was used. The 
question to be determined was, whether the protecting 
power of the substances used in the previous experi- 
ments was due to the non-conduction of the material 
of those substances themselves, or whether the air 
imprisoned between their fibres was an important 
factor. If the silk, wool and cotton did all the obstruc- 
tive work independently of the air, then the amount of 
obstruction should vary with the quantity of fibre. 
As, in the experiments already described, the fibres 
were loosely arranged round the bulk of the therm- 
ometer, it was easy to increase their quantity by pack- 
ing them more closely, and yet retaining the other 
conditions of bulk, etc., the same. 
It was evident from the results, with 16 grains, 32 
grains, 64 grains, that the protective power does not 
increase nearly in the same proportion as the quantity 
of material when packed in the same space. Had such 
been the case, and the rate of cooling proportionately 
retarded, the experiment (with eider down from the 
duck) with 64 grains should have been 1,304x4 5,216 
seconds, instead of only 1,615 seconds. 
The following displays the results obtained by 
using the same material, in same quantity,but differently 
disposed, 16 grains of each: MattieuWilliams—Philosophy of Clothing. 
31 
I'ot. times. 
*-• N OJ Ca Qv 
o o o o o 8 oo 
Heat lost or 
amount of 
cooling. 
s 
OO OO OJ ~ vp 
O OJ Ui OJ O 4- 
Raw Silk. 
1 
s's S g'-^ 
Sewing or knit- 
ting silk wound 
round bulb. 
00 
& 
to 
oo 
Ov 
to 
~ Lo 
oojoi 
Sheep’s wool, 
loose. 
VO 
4* 
o 
8 
Ov 
— 
W oolen 1 hread 
wound round 
bulb. 
2 
Ov 
to Oi - vO OO 
00 t-' N M ta Cm 
- 
Cotton wool, 
loose. 
«C 
Oo - >- 
- 00 Q\ 
o VO ca U> 0 Ox 
Cotton '1 hread 
wound round 
bulb. 
* 
OofcO-- 
O' CO O Ui Cm o* 
Lint, loose. 
00 
OJ 
00 OO - CO C\ t 
Ol o OJ to V£V 
Linen Thread 
wound round 
bulb. 
1 
Ui - - 
oj o\ o m ca 
00 OO OO C\ t4 
Linen Cloth 
wrapped round 
bulb. 
From this it is to be seen that sheep’s wool loose 
would retard the passage of heat more perfectly than 
when spun into thread. 
The “Jaros Hygienic Material” oj sheeps 
wool unspun worn next the body possesses the essentials 
for non-conduction of heat in a manner described.') 
It is an instance how an effort to apply pure science 
to practical business may react in such manner that 
practical business shall become a beneficent contributor 
to pure science. 
Another practical question suggested is: Whether 
clothing materials differ in their powers of absorbing 
the cutaneous exhalations; if so, which are the most 
effective, and what are the relations of this function to 
that of confining air, and thereby maintaining the 
temperature of the body? If these two functions are 32 
Mattieu Williams—Philosophy of Clothing. 
opposed, then how shall we effect a compromise ? If, on 
the other hand, they go together in any special material, 
the desirability of using this material is doubly indicated. 
Sheep's -wool does absorb (see Knowledge 191) the 
aquous vapeor. Loosely distributed fibres of wool in a 
suitable fabric take hold of the vapor of the insensible 
perspiration in the gaseous form, and by virtue of 
gaseous diffusion continually exchange this with the 
gasses of the outer atmosphere. 
The conclusions, therefore, is that such a material is 
best suited for clothing, both in winter and summer. 
Sir John Billingall (lecturer on Military Surgery) 
mentions his experience in India, and the proof of the 
utility of wool in checking the progress of a most 
aggravated form of dysentery in the Second Battalion 
of the Royals. The result of this has led to the 
enforcement of the use of belts for tropical service. 
Mr. Sage of the Army Clothing Depot at Pemlico, 
tells me many thousands have lately been made there. 
My experience and subsequent observations have 
proven that, although loosely woven flannels may 
advantageously prevent the sudden chills from the 
evaporations of accumulated perspiration, this is better 
done by a knitted Jteecy woolfabric worn next the skin. 
Jaros Hygienic Material, 
WOOL FLEECE KNIT. HfGIElhllG lJNDElI?W£Al? 
By L. D. Rodgers, A. M., M. D. 
Considerable scientific attention has recently been 
very profitably devoted to the question of fabrics for 
underwear most conducive to health. Interesting ex- 
periments have been made developing facts’which will 
surprise almost everyone on learning them for the first 
time. One of the simplest and most readily understood 
of these experiments was that of filling tin cans with 
hot water and wrapping each one with a different fabric, 
and then observing with thermometers the varying 
rapidity in the loss of heat. Thus showing accurately 
the relative heat preserving value of each fabric. Of 
two cans surrounded with the same amount of common 
cotton batting, in one case the cotton being compressed, 
and the other not, the loss of heat was found to be 
much more rapid in the former than in the latter. 
Showing, therefore, conclusively, that loose open fabrics 
are warmer than those which contain less air in their 
interstices. This accords with the well-known fact that 
the new flannel is warmer than old which has under- 
gone the felting- or fulling processes. Assuming that 
(From Peoples’ Health Journal, October, 1885.) 34 
Rodgers—Fabrics for Underwear. 
flannel contains ioo units of air in its interstices, the 
permeability of other substances have been found to be 
as follows: Linen, 58; silk, 40; buckskin, 58; kid, 1; 
chamois, 51. Doubling the layers of any given material 
does not diminish the loss of heat in the same propor- 
tion. Assuming the loss of heat through a single layer 
to be 100, through a double layer of the same material 
it is found to be as follows: Thin silk, 97; gutta percha, 
96; shirtings, 95; stout silk, 94; thick home-spun linen, 
91; chamois leather, 88-90; flannel, 86; summer buck- 
skin, 88; winter buckskin, 86. Thus we see that the 
loss of heat through two layers of thin silk is only three 
per cent, less than through one layer. The inference is 
that what the substance is and what its weight, does not 
make so much difference as its texture and volume. 
How the body may lose heat rapidly by wet clothing, 
and ill results follow, is shown by the following experi- 
ment: A rabbit was shorn of its fur, its temperature 
was then found to be 102 degrees. It was wrapped 
with a wet cloth and placed in a room, the temperature 
of which was 66 degrees. At the expiration of five 
hours the temperature of the rabbit was found to be 
76 degrees. The capacity of water to absorb heat is 
known to be greater than any other substance. Now, 
when our clothing is damp from perspiration or from 
any other cause, our bodies lose just as much heat as the 
moisture in our clothing is capable of absorbing. i The 
importance of always having dry material next to the Rodgers—Fabrics for Underwear. 
35 
skin is evident, and that material which will retain the 
least moisture is the best. Woolen fibre is found to 
answer this purpose more nearly than any other. In 
addition to its well-known filtering capacity, it has a 
greater stimulating action upon the skin than any other. 
On the other hand, cotton fibre, on account of its great 
capillary attraction, rapidly absorbs and retains moisture. 
A fabric, therefore, so constructed as to allow a layer of 
woolen fibre to lie between the skin and a layer of cot- 
ton fibre, and sufficiently open and loose as to contain 
the largest possible amount of air is the ideal. The 
Jaros Hygienic Underwear material, a new fabric, 
seems beautifully adapted to this end. A layer of 
woolen fibres, soft and fleecy, is firmly held on one side 
of and in the meshes of an exceeding ■porous cotton 
fabrict so that while one extremity of a fibre lies 
against the skin, the other is in contact with the cotton; 
thus admitting of the rapid transference of all damp- 
ness of perspiration to the cotton where it is retained, 
and consequently leaving no moisture next to the skin 
to absorb and diminish the heat of the body. The 
importance of this subject, and the possibilities of this 
new fabric for the prevention of colds, and their 
resultant diseases, can only be appreciated when we 
remember the simple fact that it is impossible to take 
a cold so long as a healthy condition of the skin, and 
an even temperature of the surface of the body, are 
maintained. 36 
Extracts—Renal Disease. 
TESTIMONIALS. 
BRIGHT'S DISEASE AND ALLIED AFFECTIONS OF THE KIDNEYS. 
By CHARLES W. PURDY, M. D., Prof, of Genito-Urinary and Renal 
Diseases in the Chicago Polyclinic. 
Chapter l.—Albuminuria.—Pages 54-65. 
The Skin.—“ * * * The most thorough protection to the skin is 
secured by the use of the Jakos Hygienic Weak, especially during the 
cold and damp season. * * * It will be seen that the cotton fabric 
secures a comparatively static condition of air next the skin, while the 
fleece wool combines the minimum radiation of heat from the body with 
the greatest attainable hygroscopic power, thus securing uniform dryness 
and warmth of the skin under various conditions of atmosphere. Dr. L. 
L. McArthur has demonstrated before the Chicago Medical Society the 
superiority of the Jaros Wear overall other fabrics for the purpose of pro- 
tecting the skin against rapid changes of temperature and humidity, and 
my own experience with it altogether bears out his deduction.” 
CHRONIC BRIGHT’S DISEASE OF THE KIDNEYS. 
J. H. PRICE, M. D., Elmira, N. Y. 
(Abstract of Paper read before N. Y. State Medical Society, July, 1886.) 
“ Fleece lined or silk under garments, according to the season, should 
be worn next to the skin the entire year. I would especially recommend 
for these patients the “ .Taros Hygienic Underwear.” These garments are 
light, warm, and delightfully soft. They afford full protection to the body 
against sudden chilling. Physicians—Renal Disease, Gen’l Value. 
37 
MOSES GUNN, M. D., LL. D., Treas. Rush Medical College, Professor 
Surgery, 2101 Calumet Ave. 
Mr. J. Jaros. Chicago, Dec. 10,1885. 
I have been wearing for the past few weeks the fleece-lined under- 
clothing of the Jaros Hygienic Wear. 
As a protection in extreme cold weather, this fabric is most comfort- 
ably efficacious. It also reduces to a minimum the unpleasant chilly sen- 
sations incident to a sudden change from an overheated room to the 
untempered cold of out-door winter weather. It possesses, therefore, 
hygienic value. 
Moses Gunn, M. D., LL. D. 
De LASKIE MILLER, Ph. D., M. D., Secretary Rush Medical College, 
Prof. Obstetrics. 
Mr. J. Jaros, City. Chicago, Dec 10,1885. 
I have examined specimens of your “ Jaros Hygienic Wear’’with much 
interest. In material and construction these garments fulfill completely 
the requirements of the scientific essentials in underwear, insuring to the 
highest degree both the comfort and the health of the wearer, and as such 
I recommend them. • 
De Laskie Miller, Ph. IX, M. D. 
I concur in the above. 
J. ADAMS ALLEN, M. IX, LL. IX, President Rush Medical College 
Prof. Practice of Medicine. 
I. N. DANFORTH, A. M., M. D., Prof, of Renal Diseases, Chicago Medical 
College. 
Chicago Medical College, Medical Department / 
Northwestern University, Chicago, Jan. 6,1886. j 
J. Jaros, Esq. 
My Dear Sir I am much impressed with tb _.te of the Jaros 
Hygienic Wear, especially in renal and other diseases in which sudden 
changes of body temperature are hazardous. I think it will prove a valu. 
able addition to our means of treating chronic, renal and other diseases in 
which full protection of the skin is all important. 
Yours truly, 
I. N. Daniorth, A. M., M. D. 38 
Pity’s—Pulmonary Consumption, Bronchitis. 
W. F. BOCxART, M. D. 
Black Hawk, Colo., Feb’y 5, ’89. 
Jaros Hygienic Underwear Co., Chicago, 111. 
Gents;—I am delighted with your underwear for myself,and always 
recommend it to my patients that are troubled with Lung or Bronchial 
diseases. 
Respectfully, 
W. F. BOGART, M. D. 
ADDRESS BEFORE ELMIRA ACADEMY OF MEDICINE. JULY, 1887. 
Curability and Treatment of Pulmonary Consumption. 
By J. \V. Price, M. D. 
The dress of the consumptive patient should be adapted to equalize the 
t mperature of the body, so loose that it interferes in no way with the 
n Rural functions. The underclothing should be woolen, either lamb’s wool 
or flannel After an extended obs srvation of the benefits derived from 
wearing the “Jaros Hygienic Underclothing,”—a wool fleece knit 
material of graded weights, adapted to the season, I believe to be the best 
protective devices yet known for tiu'se patients. 
They are excellent non-conductors of changes of the temperature, and 
at the same time absorb cutaneous moisture -two most important qualities. 
S. B. MUNN, M. D. 
Waterbcp y, Conn., Jan. 17,1888. 
Taros Hygienic Underwear Co.: 
I take great pleasure in recommending your Hygienic Underwear 
as the best I have ever seen. 
I have been wearing it now about four months, and can say it is the 
best protection from colds, and being so thoroughly a non-conductor, pre- 
vents the wearer from all ill effects of sudden changes of temperature; 
also a Rheumatic Prophylactic. 
A lady patient of mine, who has suffered some four years with chronic 
bronchitis, is now wearing it, and is already very much relieyed and 
improving faster with it, and without medicine, than she has previously 
with medicine, and at the same time wearing good flannel. 
Respectfully yours, 
S. B. Munn, M. D. Physicians—Bronchitis, Rheumatism. 
39 
ROBERT HUD CER, M. D., No. 103 State Street, corner of Washington. 
Mr. J. Jaros: Chicago, Oct. 24, 1885. 
Dear Sirhave great pleasure in expressing my entire approval of 
your underwea . It affords a better protection to the body in our variable 
climate than any kind of flannel in use. Nothing but wool is lit to main- 
tain the capillary circulation of the skin preserve warmth and promote in- 
sensible perspiration, without which good health impossible. I find your 
garments invaluable in the treatment of lung complaints, and recommend 
them to all my patients. 
Robert Hunter, M. D. 
JAMES NEVINS HYDE, A. M., M. D., Professor of Skin and Venereal 
Diseases, Rush Medical College, 204 Wabash Avenue, 
Chicago, February 17, 1888. 
Gentlemen I take especial pleasure in saying that I have often 
employed the Jaros Wear in cases of muscular and other forms of rheu- 
matism, and always with advantage to the patient. 
I have had knowledge of the value of these undergarments for a period 
of time sufficiently long to justify me in stating very positively that I 
regard them as a valuable means of protecting the surface of the body 
from the climatic changes to which it is much exposed in this part of the 
country. 
James Nevins Hyde. 
J. E. HARPER, A. M„ M. I). 
Prof. Ophthalmology and Otology, College Physicians and Surgeons, 
Ophthalmic College, and Attending Surgeon Oakwood Retreat, Lake 
Geneva, Wis. 
Chicago, June 6th, ’88. 
To J. Jaros, Chicago, 111. 
Dear SirI have felt for some time that I would like to give express- 
ion to my high regard for your ‘ Hygienic Underwear,” and hope you v'ill 
accept the following as a spontaneous estimate of its value as an adjunct 
to the treatment of certain diseases as well as a reliable prophylactic. I 
have used your underwear in my family and recommended it to my patient® 
during the past year, and am firmly convinced that its merits can not be 
overestimated as regards a comfortable and protecting material for under- 
garments. 
Persons affected with the rheumatic diathesis, those who have weak' 
heart or lungs, and those having catarrhal troubles, or who take cold easily, 
should use your underwear constantly. 
Respectfully, J. E. Harper. 40 
Physicians—Rheumatism. 
JOHN H. PRICE, M. D., Sec.’y Chemung County, Med. Soc., N. Y. 
J. Jaros, Esq. Elmira, N. Y., Apr. 29, 1887. 
My Dear SirThe object of clothing is to preserve the proper heat of 
the body, by protecting it both from cold and heat, and thus to prevent the 
injurious actions of sudden changes of temperature upon the skin. This 
object is most admirably accomplished by the “ Jaros Hygienic Wear.” I 
have demonstrated this most important fact in my own person during the 
past six months. For several years past I have been much annoyed by 
occasional attacks of muscular Rheumatism. Since 1 began to wear the 
“Jaros Hygienic Clothing”I have been almost entirely free from these 
attacks. I deem them a valuable auxiliary in the treatment of Consump- 
tion, Bright’s Disease and Rheumatism. 
Very truly yours. 
John H. Price, M. D. 
E. J. DORING, M. D., President Chicago Medico-Legal Society, 2406 
Prairie Avenue. 
Chicago, Jan. 14,1888. 
Mr. J. Jaros. 
Dear Sir: -Referring to your letter of the 12th, I wish to say in reply 
that I have frequently had occasion to recommend your Underwear for 
patients suffering from Rheumatism, Neuralgia, etc., and have been 
entirely satisfied with the results obtained. I shall continue to recom- 
mend it. 
Very respectfully, 
Edwin J. Doring, M. I). 
NORMAN BRIDGE, M. D., Prof, of Pathology and adjunct Professor 
of the principles and practice of Medicine, Rush Medical College. 
Chicago, 6, 5,1888. 
J. Jaros, Esq. 
Dear Sir-.—One winter’s practical use of the Underwear manufactured 
by your company, as well as the observation of the use of it by others have 
convinced me of its great value as an under clothing for protecting the body 
against cold and various diseases in some measure incident thereto, espec- 
ially rheumatoid affections. The physical principles of its construction 
appear to be correct, and it is certainly very agreeable to the wearer. 
Most truly yours, 
Norman Bridge. Physicians—Rheumatism. 
41 
DAVID WARMAN, M. D. Trenton, N. J., Feb. li, 1888. 
Jaros Hygienic Underwear Co., Chicago, 111. 
Dear Sirs:—My experience with your Hygienic Underwear, though 
somewhat limited at present, I cheerfully give you. One of my patients 
wearing it is delighted, and so am I. The patient was a sufferer from 
Muscular Rheumatism, and since he donned your garments he has not 
had an attack; although the weather has just been of the kind to produce 
the disease. In this peculiar and ever changing climate of ours, it is 
important to wear woolen undergarments the year round. They not only 
protect from cold, but heat as well, by aiding in evaporation from the 
body and keeping the surface warm. 
The principles upon which your wear is constructed is undoubtedly 
correct, in maintaining a healthy and normal action of the skin and 
thereby diminishing the liability to taking cold. I take great pleasure in 
recommending them to my patients. 
Sincerely yours, 
David Warman. 
E. W. BISHOP, A. B., M. D., Prof. Physiology and Dermatology, Chicago 
Med. College. 
, Chicago, Aug. 29, 1887. 
.Jaros Hygienic Underwear Co. 
I have much pleasure in stating that I have used your Underwear for 
several years, and have found it invaluable as a safeguard against many 
of the ills caused by sudden and severe climatic changes. I also prescribe 
it for Rheumatism. 
Yours respectively, 
R. W. Bishop. 
S. A. CONKLING, M. D. 
Canton, Ohio, Feb. 14th, 1888. 
Jaros Hygienic Co., Chicago, 111. 
Gentlemen .-—After a trial during the past winter of the .Taros Hy- 
gienic Wear I am fully satisfied of its merits in both protecting and 
properly airifying the body, and especially do I recommend it as being 
well calculated for persons predisposed to a rheumatic diathesis and a 
general weakened condition of the nervous system, thereby greatly pre- 
venting liability in contracting colds. I also recommend it as a good gen 
eral underwear because of its absorbing powers. 
I am, respectfully yours, 
S. A. Conkling, M. I). 42 
Physicians—Rheumatism. 
GEO. K. FRANKS, M. D. 
Btjrton, W. Va., Feb. 13, IMS. 
J. Jaros, Esq. 
I have been wearing this winter the fleece-lined underwear of your 
manufacture. 
As a protection in extreme cold weather, especially for physicians in 
the country who have often to get out of a warm bed and ride several 
miles in the coldest weather, it has no equal. I have tried silk, as also 
the best of ordinary flannels, but they fall far short of the Jaros Under- 
wear. 
It has always been my misfortune. I was easily affected by cold, viz: 
easy to take cold. Since wearing the Jaros Hygienic Underwear I have 
not had a single cold. 
For the underwear I claim as much a specific in rheumatism as 
quinine in intermittent. 
Since wearing your goods I have never had a single attack, while before 
I have not passed a winter without experiencing several severe attacks in 
the last twenty years. 
Respectfully yours, 
George K. Franks. 
U. S. NAVY.—Pay Inspector Department, U. S. Naval Academy. 
Annapolis, Md., Feb. 23,1889. 
Gentlemen:—I cannot refrain from expressing to you the great satis- 
faction and enjoyment I have received from the use of your Jaros Hygienic 
Underwear during the past winter. I have been almost free from rheu- 
matic pains, from which I have heretofore suffered greatly, and also 
enjoyed an exception from severe colds, which is a very unusual luxury 
with me in the winter season; all of which I must attribute to the protec- 
tion afforded by my Hygienics. I am also gratified to find that with the 
proper care in washing there is no preceptible shrinkage. In short, in 
every way, I find them the most desirable article I have ever seen for the 
object to be attained. 
I shall be so loth to part with them that I hope you will manufacture a 
lighter grade for summer wear. 
You are at liberty to make any use you may see fit of my testimony. 
Very truly yours, 
THOS. T. CASWELL, 
Pay Inspector U. S. Navy. Physicians—Rheumatism. 
43 
FROM RT. REV. BISHOP CHENEY. 
CPIAS. EDW. CHENEY. 
Rector’s Study, Christ Church, 2409 Michigan Avenue, I 
Chicago, Nov. 29, 1886. J 
J. Jaros, Esq., Room 5, Central Music Hall, City. 
Dear Sir:—I take pleasure in saying, that by the advice of my phy- 
sician, I obtained from you two suits of “Jaros Hygienic Wear.” I com- 
menced wearing the same two weeks ago Saturday last. Up to that time 
I had been a sufferer from a torturing rheumatic pain in my right shoulder 
which persisted in waking me about 4 o’clock every morning, and which 
medicines seemed to relieve only temporarily. From the hour that I com- 
menced the use of your Underwear, I have never had the slightest twing- 
ing of this pain. I feel under personal obligations to you for the relief 
which I have experienced. Very truly yours, 
Chas. Edw. Cheney. 
W. C. DAVIS, M. D., cor. W. Washington Street and Belmont Avenue. 
West Indianapolis, Iud., Feb. 14,1888. 
J. Jaros, Chicago, 111. 
My Dear Sir:—I have prescribed your Underwear for the use of 
patients with chronic rheumatism, and alwajs with very satisfactory 
results. It is also most excellent in the case of persons whose flesh is 
easily irritated by the ordinary flannel underwear, being soft and light as 
it is warm. Respectfully, 
W. C. Davis. 
F. H. VAN I.IEW, M. D. 
Mr. J. Jaros. Hinsdale, 111., May 24, 1887. 
Dear Sir:—There has been a want in the truly hygienic features in the 
undergarments so generally offered, which has in many cases added 
obstacles in the treatment of certain diseases. I feel satisfied that the 
“Jaros Hygienic Wear” possesses the great essentials in clothing, main- 
taining an even temperature over the entire body and transmitting mois- 
ture in the manner peculiarly claimed for your material. The effect on 
such patients as I have prescribed it is satisfactory indeed, and the expe- 
rience on my own person in a case of Articular Kheumatism of long 
standing, is truly marked. The condition of my body for the last two 
winters, during which I have used the “Wear,” was a feeling of comfort 
and relief from pain, formerly caused by every change of temperature. 
For Kheumatism and Catarrhal patients I am free to say this is a valuable 
adjunct to our means of treating same. 
Yours very truly, 
F. H. VAN LIEW, M. 44 
Physicians—Rheumatism, Gen’l Value. 
JOHN II. PAGE, Major 11th Infantry, U. S. A. 
Mr. J. Jaros, Chicago, 111. Fort Yates, Dak., Aug. 18, 1886. 
Dear SirI am personally delighted with your underwear, and shall 
use no other. Was free from rheumatic pains last winter, and I attribute 
it to the healthy condition of my skin from the use of your clothing. 
Very respectfully, 
John H. Page. 
We refer, with permission, as to the Scientific Principles and Hygienic 
merits of the Jaros Hygienic Wear. 
To H. A. JOHNSON, M. D., LL. IX, Emeritus Professor, Chicago Med- 
ical College, and 
N. S. DAVIS, Jr., A. M., M. D., AdJ. Prof. Practice Principles of Medi- 
cine, Chicago Medical College. 
OSCAR C. DeWOLF, A. M., M. D., Prof. Hygiene, Chicago Medical Col- 
lege, Commissioner of Health. 
City of Chicago Department of Health, ( 
Chicago, Dec. 24,1884. j 
I have been wearing during the past cold the Jaros Hygienic under- 
wear. I have never worn underclothing which gave me so much satisfac- 
tion. The garments are light, warm and delightfully soft, and if properly 
washed retain their fleecy wool surface. 
Oscar C. DeWolf, A. M., M. I). 
MARY HARRIS THOMPSON, M. D., Clinical Prof, of Obstetrics and 
Gynaecology, Women’s Med. College, 
26 Central Music Hail, 
Mr. J. Jaros. Chicago, Nov. 15, 1885. 
Dear Sir:—The “Jaros Hygienic Wear” is unsurpassed in its purpose 
of retaining an equable temperature and moisture of the surface of the 
body, thus preventing an undue and sudden chilling, thereby inducing 
catarrhs of the mucus membranes, conditions so common in this latitude. 
Its economy and therapeutic value is apparent. 
Respectfully, 
Mary Harris Thompson, M. D. Physicians—Gen’l Value. 
45 
ROBERT H. BABCOCK, M. D., No. 70 Monroe Street, Room 29. 
Mr. Jaros. Chicago, Feb. 10, 1887. 
Dear Sir:—I am sincere in expressing a favorable opinion of the “Jaros 
Hygienic Wear” so far as my experience allows me to judge. The patients 
to whom I have recommended it*are of delicate health, very susceptible to 
cold. Theyuniformly expressed themselves as pleased with the garments 
made for them by you, and as having suffered far less from the cold this 
winter than usual: a result which they attribute directly to the power of 
the underclothing to prevent sudden chilling of the body upon transition 
from a high to a low temperature. Personally, I have worn the under- 
clothing all winter, and believe my unwonted freedom from attacks of 
bronchitis due to the efficient protection afforded by the underwear. Your 
cloth seems to me to be a better non-conductor than other woolen mate- 
rials, and therefore particularly suitable to persons with heart or lung 
disease. 
I am, very truly yours, 
Robert H. Babcock, M. D. 
PLYMMON S. HATES, M. D., Prof. Gynaecology, Chicago Polyclinic. 
Mr. J. Jaros. Chicago, Aug. n, 188G. 
Dear SirI have found all the indications of a truly Hygienic Wear in 
your underclothing, and certainly consider it the ideal wear for this 
climate. 
Yours truly, 
Plymmon S. Hayes, M. D. 
We further refer, with permission, as to the therapeutic and prophy- 
lactic value of the .Taros Hygienic Wear, to the following medical gentle- 
men : 
S. SMITH, M. I)., Emeritus Prof. Materia Medica and Therapeutics, 
Hahneman Medical College, Chicago. 
A. E. SMALL, A. M., M. D., Prof. Principles and Practice of Medicine, 
Hahneman Medical College, Chicago. 
MILTON JAY, M. D., Prof. Surgery, Dean Bennett Med.College, Chicago. 
D. A. CASHMAN, M. D., Prof. Hygiene, Bennett Med. College, Chicago. 
ALBERT LEFFINGWELL, M. D. 
JAMES C. JACKSON, M. D., Head of Staff, Sanitarium, Dansville, N. Y. 46 
Physicians—Gen’l Value. 
L. J. KELLOGG, M. I)., Cor. Seventh and I Streets. 
J. Jaros, Esq. Sacramento, Cal., July 19,1886. 
Dear Sir: -In regard to your goods I am very glad to state their worth. 
They have proven more efficient than any other wear in the actions for 
which truly hygienic wear is sought, and therefore 1 cheerfully recommend 
it to my patients. It laundries beautifully without shrinking. 
Sincerely yours, 
L. J. Kellogg, M. D. 
IT. TYLER WILCOX, M. D., Cor. Garrison Avenue and Gamble Streets. 
Mr. J. Jaros. St. Louis, Mo., Jan. 31, 1887. 
Dear Sir:—With reference to the use of your “Hygienic Wear” I would 
say that I am greatly pleased with it. All my patients have been benefited 
from its use, and are delighted, some saying they would not part there- 
with for double the cost. In debilitated Nervous Troubles, Kidney, and 
especially Lung Complaints, it is a therapeutic agent, almost indispens- 
able in this and all northern climates. 
Respectfully, 
H. Tyler Wilson, M, D. 
D. W. BLISS, M. D., 621 Thirteenth Street, N. W., Attending Surgeon 
on late President Garfield. 
Washington, D. C., Oct. 80,1887. 
Jaros Hygienic Underwear Co. 
Gents:—I have been very favorably impressed with the value of your 
underwear, and especially for persons of impaired health, as a protective 
measure against the pronounced thermal changes of this locality, and am 
free to recommend their use. 
********** 
Very respectfully yours, 
D. W. Bliss. 
,T. H. THOMPSON, M. D., 204 Wisconsin Street. 
Mk. J. Jaros, Chicago: Milwaukee, Wis., Jan. 29,1887. 
Dear Sir:—After months of wear and prescription of the “ Jaros Hy- 
gienic Clothing,” I can fully endorse it as the best wear now used, and I 
confidently advise it for its prophylactic and therapeutic properties. 
J. H. Thompson, M. D. Physicians—Gen’l Value. 
47 
P. M. LUSSON, M. D. 
Mr. J. Jaros, Chicago: San Jose, Cal., Feb. 6,1887. 
Dear Sir:—I am pleased to state that the “Jaros Hygienic Wear ” has 
proven the nicest wear worn or prescribed by me, and have found them of 
great value in treatment of delicate patients. By a more general use many 
people would recover health or prolong life. 
Kespectfully yours, 
P. M. Lusson, M. D. 
WM. H. HAWKES, M. D., 1330 New York Avenue. 
Mr. J. Jaros, Chicago; Washington, D. C., Feb. 5,1887. 
Dear SirThere is indeed need of undergarments as you manufacture 
in a climate so variable. I am satisfied with the hygienic principles under- 
lying them, and have been pleased in prescribing them. Shall be glad to 
know that the wear is procurable in Washington. 
Very truly yours, 
Wm. H. Hawkes, M. D. 
J. F. JENKINS, M. D. 
Tecumseh, Mich, Aug. 28, 1887. 
Jaros Hygienic Underwear Co. 
GentlemenDuring the winter of 1886 I had the pleasure of testing 
your underwear on my own person. 1 found your “ Wear ” comfortably 
efficacious throughout the various changes of a severe winter, and in 
every way it justifies the representations made by you. I shall not hesi- 
tate to recommend the “ Wear ” to my patients where it is indicated. 
Yours truly, 
J. F. Jenkins. 
F. A. DUNSMOOK, M. D., 
Dean Minneapolis Hospital College. 
Minneapolis, Dec. 7,1887. 
.Taros Hygienic Underwear Co. 
I cheerfully certify to the use and prescription of your Hygienic Un- 
derwear. It is the most agreeable and warmest underclothing I ever 
tried. I am satisfied that in theory and practice it is the best Wear on 
the market for our climate. 
Truly yours, 
F. A. Dunsmoor. 48 
Physicians—Gen’l Value. 
E. L. TOWNSEND, D. D. S., Secretary, Southern California Odontological 
Society, 237 S. Spring street. 
Los Angeles, Jan. 28,1888. 
Jaros Hygienic Underwear Co., Chicago, 111. 
GentlemenThe goods purchased of you have'given perfect satisfac- 
tion, and I have not failed to recommend the underwear to my patients 
and friends. 
The climate here is such that makes your goods almost a necessity, 
and when properly introduced, I think no invalid will consider himself well 
clothed without a suit of the Jaros Hygienic Underwear. 
I am, yours truly, 
E. L. Townsend. 
A. J. AUTEN, M. D., corner of Wabash and 3d Streets, 
_ St. Paul, Minn., Jan. 1888. 
Mr. Jaros. 
Dear Sir:—The Jaros Hygienic Wear meets with my most hearty 
approbation. It is an ideal of perfection in every respect. 
Respectfully, 
A. J. Autkn. 
CLARA BLISS HINDS, M. D., 607 Thirteenth street, N. W. 
Washington, D. C., Feb. 1888. 
My Dear Sir:—My attention was called to your Hygienic Underwear 
during the session of the International Medical Congress in our city last 
September. Being'then in search of underwear, which combined the 
requisite of warmth, lightness and durability, I determined to try yours, 
hoping to find an article which I could with confidence recommend. 
I take pleasure in saying that after wearing the garments four months 
I find them all I had hoped, and even mere. 
I have recommended them in several cases of uterine trouble, as well 
as for delicate children, and without an exception the patient improved, 
which, as other conditions were equal, I know was due to the underwear. 
Maintaining an even warmth over t-he entire surface of the body the 
circulation is improved, the various organs respond, and a general im- 
provement in the patient is the result. 
I unhesitatingly recommend the Underwear, and -earnestly hope that 
many physicians may try it in chronic uterine troubles, and in the wasting 
diseases of childhood, as I feel great good to suffering humanity will come 
through this agency. 
* -fe * -if a- j. j. 
Kespectfuilv, 
Clara Bliss Hinds. Reports—Gen’l Value. 
49 
O. M. VAUGHAN, M. D. 
Covert, Mich., Jan. 27,1888. 
Jaros HYGiENic Underwear Co., Chicago, 111. 
Dear Sir:—The Underwear that I purchased of you has proved entirely 
satisfactory. I find it just the thing in this climate where sudden changes 
in the temperature are almost a daily occurrence. 
I seldom wear an overcoat except when riding. Indoors I only wear 
a light summer coat. The Underwear keeps one warm. 
Very respectfully, 
O. M. Vaughan. 
H. A. HAMILTON, M. I). 
Perrysburg, Ohio, Feb. 21,1888. 
Mr. J. Jaros. 
Dear SirIn every instance in which I have recommended the Jaros 
Hygienic Underwear it has been highly satisfactory, answering all 
the indications claimed for it. 
Respectfully, 
H. A. Hamilton, 
CASPER BARSTOW, M. D. 
East Hartford, Conn., Jan. 26,1888. 
Mr. Jaros. 
Dear Sir:—After wearing the Jaros Hygienic Wear thus far during 
the winter, I take pleasure in speaking of its merits. 
I consider it the best kind of underwear ever made. Never having 
been able to wear any kind of woolen underwear before on account of the 
irritation it produced, I was made glad when I found that the Jaros H ygi- 
enic Wear did nothing of the kind. The principles of the goods is one of 
the best. 
I experience no chilly feeling now when going from a heated room and 
into the cold wind, as I always did with any,other underwear. 
The fitting of the garment is another great feature, it being the same 
after repeated washing, so unlike any other woolen garments. 
Respectfully yours, 
Casper Barstow. 
ROBT. STEVENSON & CO., 92 and 94 Lake Street. 
J. Jakos, Esq. Chicago, Dec. 1st, 1886. 
Dear SirTwo years ago I was prostrated by intercostal neuralgia. 
My physician—Dr. W. H. Denslow Lewis, of Hyde Park—prescribed your 
underwear, which I have worn ever since, both summer and winter. 
They afford me great comfort, and have thus far warded off all neu- 
ralgic symptoms, although my duties compel me to sit in a draft much of 
the time. 
Sincerely yours, 
I. Giles Lewis. 50 
Reports—Gen’l Value. 
H. M. BINGHAM, M. D., 170 Juneau Ave. 
Milwaukee, Dec. 31, 1887. 
Jaros Hygienic Underwear Co., Chicago, 111. 
Gents:—In two cases of chronic disease I have seen a very good effect 
from the Jaros Underwear, and I am in the habit of recommending this 
wear to all my patients, and in lectures to students. 
H. M. Bingham. 
GEO. HOMAN, M. D., Prof. Hygiene, Surgeon Police Department, St. 
Louis. 
St. Louis, Mo., Jan’y 20,1888. 
J. Jaros, Esq., Chicago, 111. 
Dear Sir:—I am enabled by personal experience to testify to the com- 
fort derived from the use of your Wear during the cold weather, and that 
the anticipated objection occurring to me before trial, namely, that the 
unmixed wool in cpntact with the skin might prove uncomfortable, has 
not appeared. In softness and warmth I have never worn any fabric that 
equals it, while my original impression at first sight in regard to the 
scientific construction of the principals upon which it is based, has been 
strengthened by experience. 
Very truly yours, 
Geo. Homan. 
R. HARYEY REED, M. D., Surgeon Chief, Baltimore & Ohio R. R. Co., 
Secretary State Sanitary Association, Ohio.; Treasurer Naitonal Asso- 
ciation Railway Surgeons. 
Mansfield, O., March 9, 1888. 
Mr. J. Jaros, Chicago, 111. 
Dear Sir:—From personal experience I And your Underwear the most 
comfortable and the best safeguard from taking cold of anything of the 
kind I have ever seen. 
I have no hesitancy whatever in heartily seconding it for Railroad 
employees, Police and Fire Departments, as especially well suited for 
their use, or any person exposed to the sudden changes of the weather in 
our climate. 
Yours very truly, 
R. Harvey Reed,M. D. 
.1. E. HARMS, M. D. 
Auxvasse, Mo., Feb. 5, 1889. 
Jaros Hygienic Underwear Co., Chicago, 111. 
Gentlemen;—It gives me great pleasure to say that after having tried 
your wear I find it affords an admirable protection from cold, and so far 
as preserving the warmth of the body is concerned, I regard it useful as a 
prophylactic and therapeutic agent. 
Yours truly, 
J. E. HARRIS, M. D. Reports—Gen’l Value. 
51 
JAMES COLLINS, M. D„ 704 Franklin Street. 
Philadelphia, Pa., Feb. 5, 1889. 
Jaros Hygienic Underwear Co. 
GentlemenIt affords me pleasure to stale that I have found your 
underwear elastic, pleasant and durable. Especially is this wear indicated 
where there is a disposition to active perspiration, as the peculiar arrange- 
ment of the fibres of the wool prevents the surface of the body from con- 
tinuing damp and sticky. 
Yours truly, 
JAMES COLLINS, M. I). 
FRANK B. GOLLEY, M. T)„ 116 Grand Avenue. 
Milwaukee, Wis., Jan. 31, 1889. 
Jaros Hygienic Underwear Co., Chicago, 111. 
Gentlemen:—The underwear purchased of you for use in my family 
has been a source of great comfort. The usual so called cold taking and 
chilliness incident to our changeable climate has, I am glad to say, failed 
to appear since your goods were used. Shall recommend them wherever 
opportunity affords. 
Respectfully, 
F. B. GOLLEY, M. I). 
F. B. KELLOGG, M. D. 
New Haven, Conn., Mar. 25,1886. 
I 
I have tried the Jaros Hygienic Wear in my practice and consider it 
superior to anything I have seen for maintaining the surface of the body 
at an equable temperature. It is a safeguard against sudden chills, and 
hence of great service to sensitive temperaments in a changeable climate. 
Yours truly, 
F. B. KELLOGG, M. D. 
G. E. ABBOTT, M. D. 
Bryn Mawr, Pa., Feb’y 13, ’89. 
Jaros Hygienic Underwear Co., Chicago 111. 
Dear Sir:—After careful personal examination,I do not hesitate to 
recommend your wear. It fulfills the demands of Hygiene and of comfort. 
I have found it of great service as a therapeutic agent in cases in which 
there is want of nervous or vascular tone—prevalent complaints in this 
climate. Also in chronic diseases and general enfeeblement when it is 
essential that the peculiar susceptabilities to changeable climatic condi- 
tions shoidd be guarded against. 
Yours truly, 
G. E. ABBOTT, M. D. 52 
Reports—Gen’l Value. 
S. D. KENNEDY, M. D. 
Annapolis, Md., July 15th, 1890. 
Mr. I. Jaros. 
Your communication of July 1st received. In three cases in which I have 
had occasion to note the use of the “ Hygienic Underwear,” it seems to have ac- 
complished all that is claimed for it as a remedial agent. 
Very respectfully, 
S. D. Kennedy. 
ASA HORR, M. D„ 1131 Main Street. 
Dubuque, Iowa, May 19th, 1890. 
To Mr. I. Jaros, Chicago, 111. 
Your underwear has been prescribed by me in a number of cases in which 
I considered proper protection important. In rheumatic cases I have found it 
of special benefit, as also in pulmonary and kidney affections. 
My deeided conviction is that its use will prove materially advantageous in 
connection with other treatment in such cases. The body is thereby protected 
from sudden chilling under climatic changes, and that is most important. I 
shall take pleasure in continuing to prescribe your “Hygienic Underwear,” and 
hope your further endeavors*will meet with the success it deserves. 
Yours very truly, 
Asa Horr, M. I). 
H. D. DIDAMA, M.D., L.L.D., Dean of the College of Medicine, Syracuse 
University. 
Syracuse, July 3d, ’90. 
Dear Mr. Jaros. 
I have commended your Hygienic Wear because I regard it as the best in 
the market. 
It is specially useful for asthmatics, and for those wTho suffer from bron- 
chial catarrh, because it protects from sudden and often disastrous changes of 
atmospheric temperature. And then it is so unirritating and comfortable and 
delightful to the wearer. 
Yours truly, 
H. D, Didama, M.D., LL.D. Reports—Gen’l Value. 
53 
A. L. TALMAGE, M. D., 8 Park Street. 
New Haven, Conn., 4-20-89. 
Gentlemen:—The Jaros Hygienic Underwear gives me entire satisfac- 
tion, and I cheerfully recommend it. 
Respectfully. 
A. L. TALMAGE, M. I). 
J. H. TILDEN. M. D. 
Wichita, Kan., Feb. 6,1889. 
.Taros Hygienic Underwear Co., Chicago, 111. 
Gentlemen;—Your Hygienic wear is all you represent it to be. Those 
for whom I ordered suits are well pleased, and say they will not dispense 
with same, and signify their intention of ordering again when they 
need. It is a therapeutic and prophylactic agent, and every one ought to 
know of your wear, and wear it. 
Respectfully, 
J. H. TILDEN, M. D. 
DR. A. CRAWFORD. 
Miles, Iowa, Feb’y 2,1889. 
Jaros Hygienic Underwear Co., Chicago, 111. 
Gentlemen:—I have this to say about your wear. It has been tested 
both by myself and a number of my patients, for over two years, and 
always with the most satisfactory results. The durability of these goods 
is beyond my expectations. I do not expect to wear any other, nor change 
in my recommendations while these are on the market. 
Respectfully yours, 
A. CRAWFORD, M. D. 
JOHN W. FLICK, M. D. 
Honeoye Falls, N. Y., Feb’y 1889. 
Jaros Hygienic Underwear Co., Chicago, 111. 
Dear SirsWhile I do not believe in the practice of recommending to 
others everything or anything you like yourself, I must make an exception 
to the rule in the case of your Hygienic Underwear. For years I have 
had difficulty in finding the right quality of underwear for myself, always 
trying my best to secure the best in the market, but oftener disappointed 
than pleased. The goods of your manufacture please me in every respect, 
and all to whom I have recommended them speak in the highest terms of 
them. There is ao doubt in my mind but that many of our winter diseases 
and ailments could be avoided, and others easier cured, by the use of these 
undergarments. You have my best wishes for success. 
Truly yours, 
J. W. FLICK, M.D. 54 
Reports—Gen’l Value. 
E. L. R. THOMSON, 1162 Chapel St. 
New Haven, Ct., April 18, 1889. 
Gentlemen:—Permit me to add a word to the many which you have un- 
doubtedly already received in favor of the Jaros Hygienic Underwear. I 
have worn them for two winters and one summer and am happy to express 
myself as perfectly satisfied with them, for I find they more fully meet my 
requirements than any other underwear now upon the market. It is 
enough for me to say that my experience with them has proven conclu- 
sively to me that they possess all the properties ascribed to them by the 
makers. 
Yours very truly, 
E. L. R. Thomson. 
J. F. MERRY, General Western Passenger Agent, Illinois Central Ry. 
Manchester, Ia., Oct. 6, 1888. 
Jaros Hygienic Underwear Co., Chicago. 
GentlemenI am not in the habit of giving testimonials, and as a rule 
am opposed to any thing of the kind, but after suffering from rheumatism 
and kindred diseases for several winters, I was persuaded by a friend to 
try Hygienic Underwear, and I am compelled to say that from the time I 
began using them last November until spring I did not have a touch nor 
a single chill during the entire winter, and I am confident that it was 
attributable to the use of your Underwear, and I have not hesitated to re- 
commend them at every opportunity. 
*********** 
Yours truly, 
J. F. Merry, 
Gen’l Western Passenger Agent. 
In a letter to a friend, Mr. Merry wrote at the time of receiving the 
Underwear as follows. 
Manchester, Ia., Dec. l, 1886. 
Going home yesterday to dinner, I found awaiting me a suit of under- 
wear, and I was not very long in putting myself inside of them, hut with 
no idea that 1 could wear them, having tried almost everything that con- 
tained wool, but never having found a garment I could wear next to my 
skin containing a particle of wool. I have worn the suit for two days 
without an unpleasant sensation; on the contrary, they are delightful, and 
just what I needed. 
Please have the following order filled for me. 
Yours truly, 
J. F. Merry. 55 
GEO. P. CARPENTER, M.D. 
Cedar Rapids, Ia., May 20, 1890. 
I have examined the Jaros Hygienic Underwear, and consider it the most 
perfect protection from severe cold and changes in temperature that I ever 
saw. Especially will this underwear be useful for those afflicted with rheuma- 
tism, lung troubles, or a dry condition of the skin. If the actual use of 
these goods substantiates the theory I have formed, they will be a valuable aid 
in the treatment of diseases, as well as to the comfort of the wearers. 
Respectfully, 
To I. Jabos. Geo. P. Carpenter, M.D. 
Among others we refer also to the following medical gentlemen regarding 
the Therapeutic and Prophylactic value : 
Dr. Adair, J. W., Massilon, Ohio, 
** Bingham, H. M., Milwaukee, Wis., 
“ Blodgett, Youngaville, Pa , 
“ Barnes, G. W., San Diego, Cal., 
“ Beers, J. E., Ithaca, N.Y., 
*• Barber, L. P., Tracy City, Tenn., 
" Clements, J. M., Oxford, Pa., 
“ Cleveland, N. B., Chicago, 111., 
" Clairebone, Herbert, Petersburg, Ya., 
“ Crain, M., Butland, Yt., 
“ Franks, Geo. K„ Burton,W. Va., 
“ Garth, Thomas, Clarion, la., 
“ Hollister, Chicago, 111., 
“ Hood, T. B., Washington, D. C., 
“ Heizman, C. L. (U. S. A.), West Point, N. Y., 
“ Leeds, L. L.. Lincoln, 111., 
*• Lowring, Valpariso, Ind., 
“ Morgan, Dudley, Washington, D. C., 
“ Moore, A. V., Ambia, Ind., 56 
Dr. Porter, M. G., Lonaconing, Md., 
«« Pierce, N. H., Chicago, 111., 
** Sutton, K. P., Lewisburg, Ky„ 
“ Tye, Geo. A , Chatham, Canada, 
“ Yaughan, O. M., Coverts, Mich., 
« Woodward, A. W., Chicago, 111., 
«< Weems, E. W., Spokane Falls, Was., 
<« Young, H. B., Burlington, la., 
« Yonkey, W. P., Kossville, Ind., 
and many others. FOLLOWING REPORTS 
FROM 
Equipment Branch, U. S. Army, 
Pay Inspector’s Department, U. S. Navy, 
Police, Fire Departments, 
Railroad Companies, Etc. National Association Fire Engineers. 
PROCEEDINGS SIXTEENTH ANNUAL CONVENTION. 
Minneapolis, Minn., Aug. 15, 16, 17 and 18, 1888. 
REPORT OF COMMITTEE ON EXHIBITS. 
To the President and Members of the National Association Fire 
Engineers. 
Gentlemen: 
The undersigned Committee4on Exhibits begs leave 
to submit the following as their report: 
THE JAROS HYGIENIC UNDERWEAR FOR FIREMEN. 
Underwear is a prime factor in acting as a guard 
against influences from without, and if of a properly 
constructed material, must tend much toward raising 
the efficiency of men in service, and thereby increase 
the standard of an already progressive department. 
The material—the Jaros Hygienic Wear—is a combina- 
tion of unspun wool knitted into the meshes of a spun 60 
National Association Fire Engineers. 
cotton fiber. This is after the recommendation of most 
eminent medical scientists in America and Europe. The 
wool unspun, worn next the body, acts as a cutaneous 
stimulant (guarding against irritation so often apparent 
with spun fiber), the body temperature being stored 
between the individual fibers, prevents the cold from 
directly striking the body from without (acting like 
double casement windows in a house), and, therefore 
so valuable when men are forced to sudden changes 
from in-doors to the cold of out-doors. The wool, 
again, absorbs moisture from the body, and transports 
it readily to the outer framework of cotton, thereby 
protecting against the possibility of wet clothing next 
the skin to chill the surface at every change in tempera- 
ture. The cotton framework without, makes the mate- 
rial two-fold in its action; for while the wool has a 
power of absorption of moisture, the cotton has that of 
attraction and retention, so that any perspiration exuded 
from the body is taken up by the cotton from the wool 
and retained, while any water from without striking 
the cotton surface is attracted and retained, and pre- 
vented from penetrating through to the body. With all 
this, the material is porous, and does not therefore, 
retard the poisqpous exhalations from passing off. The 
material is as nearly non-shrinkable as can be claimed 
of any material, owing to the cotton back, thereby hav- 
ing an underwear which will fit properly at first as well 
as last. No laps or folds to allow air to circulate next National Association Fire Engineers. 
61 
the body are apparent, where the consideration 01 
shrinkage is discarded (which is the case with wear of 
spun wool, whether knitted or woven.) The wear is 
also more durable. The cost within the line of good 
woolen underwear. With a due consideration of all the 
scientific as well as practical facts and experiences, the 
Surgeon-General of the United States Army recom- 
mended the wear to the Quartermaster-General, War 
Department, U. S. Army, and the result of experience 
by men and officers has given this underwear prom- 
inent place under the equipments of the Northwestern 
posts. They also point with great pride and satisfac- 
tion to the service among Police and Firemen in such 
cities where practical application has been made. They 
feel assured that the consideration of this subject, 
though comparatively new with the chief officers of our 
departments, will gain a hearing, with the view of rais- 
ing the condition of the men. 
Your Committee, upon examination, would recom- 
mend it for your consideration. 
Very respectfully submitted, 
Chief, Providence, R. I. - - G. A. Steere, 
“ Macon, Ga. - - - - L. M. Jones, 
“ Springfield, Mass. - - A. P. Lesiiure, 
“ New Albany, Ind. - C. T. Matthews, 
“ New Orleans, La. - - Thos. O’Connor, 
Committee. Fire Department Reports. 
62 
CHICAGO FIRE DEPARTMENT. 
Through introduction of Dr. O. C. DeWolf, Commission of Health, tc 
Chief Swenie, of Fire Dept., the following report was the result with the 
men of 1st Battalion with the extra heavy fleece wear: 
IOHN REDELL, Chief of 1st Battalion, C. F. D. 
Fire Department of the City of Chicago, ) 
Chicago, III., Feb. 17,1886. J 
J. Jaros, Esq. : 
Sir:—Having become interested in the results from wearing your 
underwear by myself and my men, I am pleased to state their own experi- 
ence, which is satisfactory in every particular, as to protection against the 
cold and changeable temperature; raising the general condition of the 
body, and maintaining an even temperature under allthetryingcondi- 
tions; does raise their efficiency. Personally, I can corroborate the good 
effect from wear, through the most trying conditions. 
Very respectfully, 
John Redell. 
FROM CHICAGO FIREMEN—CAPTAINS OF COMPANIES. 
This document, signed by Captains of different companies, was made 
for the purpose described, in the interest of the Officers and Firemen of 
those and other companies. 
Chicago, June 10, 1888. 
Jaros Hygienic Underwear Co. 
Gentlemen:-After thorough application of your Hygienic Underwear 
for a time sufficiently long to testify to its superiority for firemen during 
climatic changes in winter, we are satisfied of its filling all claims you 
make. 
We are desirous of further adoption, and respectfully beg you to make 
such arrangements as will gain for us your next season’s contract price. 
Thanking you for your endeavors in our interest we have the honor 
to be 
Yours respectfully, 
ROBERT PALMER, Captain Engine No. 1. 
CORNELIUS MANNING, “ “ “ 6. 
JOHN HENNESSY, “ “ “ 13. 
E. C. ANDERSON, “ “ “ 17. 
JOHN FITZGERALD. “ “ “ 19. 
MICHAEL R. DRISCOLL, “ “ “ 32. 
MICHAEL EHRET, “ “ “ 42. 
NICHOLAS WE IN AND, “ “ “ 14, 
JAMES HEANEY, “ “ “ 5. 
JOHN LYNCH, “ “ » 18. 
DAVID J. MAHONEY, “ “ “ 29. 
HENRY GREENHOFF, “ “ “ 11. 
JOHN COOK, Captain Hook and Ladder No. 2. 
ISIDORE P. SMITH, “ “ “ “ “ 9. 
PATRICK DOYLE, “ “ “ “ “ 5. 
F. J. RIESS, “ “ “ “ “ 3. 
Etc., Etc., Etc. Fire Department Reports. 
63 
REPORT OF FIRE MARSHAL TO THE CITY COUNCIL. 
OF THE CITY OF CHICAGO, FOR THE FISCAL 
YEAR ENDING DECEMBER 31, 1888. 
In the report of Chief Swenie on the health of Department, the fol- 
lowing is stated: 
“Compared with previous years the mortality of the Department 
during the past year has been light.” 
BOSTON FIRE DEPARTMENT. 
JOHN W. REGAN, Ass’t Chief. 
Boston Fire Department, I 
Boston, May 23, 1889. j 
Jaros Hygienic Underwear Co., Chicago, 111. 
Mr. Jaros—Dear Sir:—There has been so great a progress in the 
excellence of service in our Fire Department that it is safe to say we are 
now at a time when it is necessary to consider matters that will preserve 
the good condition of our working forces (the firemen). 
The work you are doing in this direction deserves encouragement 
with Fire Departments; for a recount of the value of proper underwear 
comes strikingly before us after the use of the “Jaros Hygienic Under- 
wear.” The experience of our men has been very satisfactory indeed in 
every manner, protecting against the dangerous influences of the extremes 
that a fireman must suffer in winter. My first impulse was to consider 
the claims you made as exaggerated, but a few facts which are my experi- 
ence will illustrate to you how fully this underwear meets the ideals for 
protection. 
I have been a sufferer of rheumatism for many years, contracted in 
service. Since I have worn your underwear it has not troubled me at all, 
though I have been subjected to trying service the last winter. 
On Saturday evening, the 6th of October, 1888,1 put on your underwear. 
It was cold and wet, typical New England weather. We had a fire in 
a six-story building on the water front lasting four hours. I came out of it 
with the water coming out of the tops of my rubber boots, completely 
wetted through, so that I had to undress in the yard of my dwelling when 
I got home. No ill effects were the result of that; when otherwise I would 
have cough, cold, and surely rheumatic attacks. 
/ About November 15th we had a very bad fire and had to fight it three 
flights before we got to the top, the sixth story. Usually I get wet at 
a fire. In this I did not, but instead I became thoroughly overheated from 64 
Fire Department Reports. 
wearing a very heavy pilot cloth coat and the result was, that I got sweated 
through and through. I did not get home until 3 o’clock in the morning 
(nearly, six hours), but I felt splendid. With other underwear, best 
woolen, I always experienced a cold wet sensation under similar circum- 
stances, down my back, and generally miserable until I could make a 
change. 
This I consider the most important test for firemen and I feel more 
than ever that the “Jaros Hygienic Underwear” fills a long felt want in 
Fire Departments. I cheerfully say: I would not be without it and many 
of our men join me in this and say money cannot buy it from us. 
Wishing you further success in the introduction of a truly meritorious 
article and one based on scientific principles, I am 
Yours truly, 
John W. Regan, Ass’t Chief. 
NEW HAVEN, CONN., FIRE DEPARTMENT. 
Headquarters New Haven Fire Department, I 
Office, No. 15 City Hall.) 
GentlemenThe “Jaros Hygienic Underwear” furnished by your firm 
to a large number of the members of the New Haven Fire Department for 
winter wear has given very general satisfaction. Many of the men who 
have practically tried them, express themselves highly pleased and 
that they would not wear anything else as a substitute if the cost was 
much higher than what they paid for them. 
They are no doubt of great value as a protection against the sudden 
changes in our climate and proof against taking cold. 
Very respectfully, 
A. C. Hendricks, Chief Fire Dept. 
BRIDGEPORT, CONN., FIRE DEPARTMENT. 
Bridgeport, Conn., April 16,1889. 
Dear Sir:—The “Jaros Hygienic Underwear” furnished by you to 
myself and the officers and members of the Bridgeport, Conn., Fire 
Department have proved all you recommended of them, and I think no 
fireman should be without them. 
Respectfully yours, 
Chas. A. Gerdenier, Chief Fire Dept. Fire Department Reports. 
65 
CITY OF CLEVELAND, OHIO- 
Office Board of Fire Commissioners, 
August 25, IP . 
A. J. SPENCER, Secretary. 
Mb. I. Jabos, New York. 
Dear Sir:—A thorough examination of the “Jaros Hygienic Underwear” 
has proven to me the correctness of the scientific theories upon which it is 
based. In view of the necessity of a most thorough protection for firemen 
to guard against the influences of weather and service, I have taken particular 
interest jn going into the details of what this Underwear will aecomplish. The 
reports from other departments place this Underwear as an important require- 
ment of their clothing, and my impression is that the benefits to men in service 
in this department will be marked. From the mention made bv Chief Dickin- 
son on the value of this Wear my opinion is fully borne out. 
Very respectfully, 
L. L. Tbavis, M. D., 
Surgeon Cleveland Fire Dept. 
FIRE COMMISSION OF DETROIT, MICH. 
Office of the Secretary, 1 
August 21, 1890.) 
Mb. Jabos. 
My Dear Sir:—In reply to your inquiry relative to the benefits derived by 
our men from the use of your Wear, I beg to state that I have yet to learn of a 
single case of illness due to exposure of any man who has worn these garments. 
They were introduced into this Department about three years ago, and quite 
generally adopted by our men. As I have said, our records do not show that a 
man was obliged to go off duty during any cold months of the year on account 
of sickness. I know of several who did not get the Wear who were ill, and pur- 
chased it later on account of the good words said of it by their comrades. The 
Wear is very popular in this Department, and from what our men tell me, they 
prefer it to any other. Very truly yours, 
James E. Tbvon, Secretary. 
FIRE DEPARTMENT, CITY OF ST. PAUL. 
St. Paul, Miun, Jan. 1, 1890. 
Mb. I. Jabos. 
Dear Sir:—The Jaros Hygienic Underwear has been in use with us for last 
three seasons, and I can highly recommend it to all Fire Departments, as this 
mnderwear is considered by us as the best possible protection against cold and 
ohangeable temperatures, which are especially characteristic of this latitude, 
and its use has resulted in great protection of health and a corresponding in- 
creased efficiency, and I find them the most desirable article I have ever seen 
for the object to be attained. 
• Very truly yours, 
John Jackson, 
Chief Engineer. 66 
Fire—Police Department Reports. 
OMAHA, NEB., FIRE DEPARTMENT. 
Office of Chief Engineer Omaha Fire Department, I 
Omaha, Neb., Feb. 21,1887. f 
Jaros, Esq., Chicago, 111. 
Dear Sir:—With regard to the “Jaros Hygienic Wear,” extra heavy 
3eece, I can say they have given eminent satisfaction among the number 
of members of the Omaha Fire Department, who have found it very com- 
fortable in the biting blasts of winter, while fighting fire in exposed 
streets. These impenetrable undergarments are just the necessity for men 
whose calling keep them out doors in winter and at nights, and they will 
certainly meet with approval by all who try them in rigorous weather, as 
they were unanimously commended by my brave fellows in this metropolis 
of the Upper Missouri. 
Yours respectfully, 
J. J. Galligan, 
Chief Fire Dept. 
The Underwear has been largely used in the following Fire Depart- 
ments, and the reports received from the men are satisfactory. 
New York City, N. Y. Milwaukee, Wis. 
Brooklyn, N. Y. St. Paul, Minn. 
Hartford, Conn. Minneapolis, Minn. 
Newark, N. J. Evansville, Ind. 
Detroit, Mich. Hyde Park, III. 
Grand Rapids, Mich. Town Lake, 111. 
CHICAGO POLICE DEPARTMENT. 
INSPECTOR OF POLICE, City of Chicago, 
Chicago, January, 1889. 
Oil the recommendation of Dr. Henrotin, Surgeon of Police and Fire 
Departments, to Chief and Inspector of the Chicago Police Department, 
the “Jaros Hygienic Underwear” was brought to the notice of the members 
of the force, and has been used for a number of years with greatest satis- 
faction. The consideration of personal Hygiene to raise the efficiency of 
policemen, is gaining more general attention by Heads of Departments, 
and my personal observation as Inspector of this force is corroborative of, 
the necessity of regarding the question of clothing for officers; especially 
during the inclement and cold seasons, from October 1st to April 1st, when 
disabilities arise from exposure, which result in pulmonary and kidney 
troubles and rheumatic affections. Police Department Reports. 
67 
The “Jaros Hygienic Underwear” has proven a most efficient guard, 
raising the condition of the men, and bearing out fully the recommenda- 
tions of Dr. Henrotin. My personal experience is corroborative of this. 
Proper underwear makes an overplus of outer clothing, which is debilitat- 
ing for men in service, unnecessary. I take pleasure in giving my opinion, 
and the result of experience with our men, and do not doubt that the 
underwear, when applied, will assert its worth in all the claims that are 
made for it. 
John Bonfield, Inspector of Police. 
ST. LOUIS POLICE DEPARTMENT. 
Office of Board of Police Commissioners, Four Courts, 
St. Louis, Mo., Feb. 3,1888. 
CHIEF OF POLICE. 
Jaros Hygienic Underwear Co., Chicago, 111. 
Dear Sirs:—From experience of men now using your Wear, it is indeed 
satisfactory. The Wear is all that you claim for it, and cannot fail of fur- 
ther adoption. 
Very truly yours, 
Frank R. Tate, Secretary. 
ST. LOUIS POLICE DEPARTMENT. 
GEO. HOMAN, M. D., Prof. Hygiene. 
SURGEON POLICE DEPARTMENT, St. Louis. 
St. Louis, Mo., January 20,1888. 
J. Jaros, Esq., Chicago, 111. 
Dear SirI am enabled by personal experience to testify to the com- 
fort derived from the use of your Wear during the coid weather, and that 
the anticipated objection occurring to me before trial, namely, that the 
unmixea wool in contact with the skin might prove uncomfortable, has 
not appeared. In softness and warmth I have never worn any fabric that 
equals it, while my original impression at first sight in regard to the 
scientific construction of the principals upon which it is based, has been 
strengthened by experience. 
Very truly yours, 
Geo. Homan, M. D. 68 
Police Department Reports. 
DETROIT POLICE DEPARTMENT. 
Accepted by advice of Dr. Book, Surgeon of Police Department, to Police 
Commissioners, Dec. 29, 1886. 
JAMES E. PITTMAN, Superintendent of Police. 
SUBJECT, “JAROS HYGIENIC WEAR.'’ 
Metropolitan Police Department, j 
Superintendent’s Office, Detroit, Mich. April 22,1887. f 
Mr. J. Jaros, Chicago. 
Dear Sir:—I take pleasure in stating that the members of this depart- 
ment who used your undergarments (ex. heavy fleece) during the past 
winter, are unanimous in expressions of approval and satisfaction. They 
proved to be fully as efficacious for comfort, and protection against cold 
and change of temperature, as was promised for them. I have no doubt 
that the use of these garments, which was limited (it being first season) 
during the past winter, will be greatly extended in this department in the 
future. 
Respectfully, 
James E. Pittman. 
The Detroit Departments are now generally using the Underwear. 
'She satisfaction and benefits from continued use being more marked. 
WASHINGTON, D. 0., POLICE DEPARTMENT. 
Headquarters of the Metropolitan Police, 
Washington, D. C., Sept. 29, 1887. 
Jaros Hygienic Underwear Co., Chicago, 111. 
GentsI beg to say, in reply to your inquiry, that the Surgeons of this 
Department made a very favorable report upon the Underwear of your 
manufacture. 
Very respectfully, 
W. G. Moore, Major and Supt. 
MINNEAPOLIS, MINN., POLICE DEPARTMENT. 
Minneapolis Board of Police Commissioners, 
Minneapolis, Minn., Marcli 20, 1889. 
Jaros Hygienic Underwear Co., Chicago, 111. 
Gentlemen:—I have talked with nearly every man in our Department 
that is using your Underwear; also with a number of members of the Fire Police Department Reports. 
69 
Department. Every man is emphatic in pronouncing your Underwear 
vastly superior to anything ever used by them before. You will undoubt- 
edly continue placing the goods with our Department. Personally I wish 
to say, that I have tried most of the standard makes of Underwear, but I 
never wore anything that gave me such perfect satisfaction and uniform 
comfort as your goods. 
This is not written on your solicitation. 
Very respectfully, 
H. A. Norton, 
Sec’y Board Police Commissioners and Mayor’s Sec’y. 
POLICE DEPARTMENT OF THE CITY OF MINNEAPOLIS. 
Minneapolis, Minn., Aug. 17, 1888. 
(Report.) 
DR. E. S. KELLEY, Surgeon of Police. 
n a recount of the benefits derived by the policemen of our Depart- 
ment last winter, I have found a full confirmation of the claims made for 
the “Jaros Hygienic Underwear.” The peculiarly cold and persistent 
changes of temperature made the last season trying for the physical con- 
dition of our officers; added to this a class of winter cholera prevailed 
here, which was very debilitating. The observations have been that alt 
the men who wore the “ Jaros Hygienic Underwear” were free from these 
attacks, and maintained a normal condition throughout. 
E. S. Kelley, M. D., Police Surgeon. 
The Underwear has been largely used In the following Police Depart' 
ments, and the expressions of the men are satisfactory. 
New York City, N. Y. 
Brooklyn, N. Y. 
Brooklyn and New York Bridge Police. 
Newark, N. J. 
Hartford, Conn. 
New Haven, Conn. 
St. Paul, Minn. 
Town Lake, III. 
Chicago Park Police. 70 
U. S. Army and Navy Reports. 
REPORT EQUIPMENT BOARD, U. S. ARMY. 
War Department, Quartermaster General’s Office, i 
Washington, D. O., Sept. 13,1887. j 
Board met this day. 
PresentCol. Chandler and Capt. Rodgers. 
After carefully examining the Wool Fleece Underwear submitted by 
Mr. Jaros, of Chicago, and having read his testimonials in its favor, the 
Board begs leave to report that this underclothing possesses considerable 
merit and would, doubtless, prove very acceptable to troops serving in 
high latitudes. 
*********** 
(Official Copy.) 
John Rodgers, Capt. & M. S. K., U. S. A. 
War Department, Quartermaster General’s Office, l 
Washington, D. C., Sept. 20, 1887.) 
Mr. J. Jaros, Chicago, 111. 
Sir:—In compliance with your request of the 17th inst., I herewith in- 
close a copy of the report of the Equipment Board of this office upon 
the Fleece Underwear presented by you for the examination of this De- 
partment. 
I have no objection to the publication of said report. 
Very respectfully, your obedient servant, 
S. B. Holabird, Quartermaster-Gen., U. S. A. 
FORT ABRAHAM LINCOLN, DAK. 
JOHN H. PAGE, Major 11th Infantry, U. S. A. 
United Sta es Army, War Department, I 
Fort Abraham Lincoln, Dakota, Jan. 20,1886. j 
Mr. J. Jaros, Chicago, 111. 
Sirs:—Your heavy wear I have named “Blizzard” Underwear, after 
wearing a suit myself, with the mercury 27 degrees below zero, with a 
twenty-mile wind, I was perfectly comfortable, and felt a warm glow of the 
skin during the whole trip. My ambulance driver reports his experience 
with the thermometer 36 degrees below zero, and in a heavy gale, saying 
the drawers were much warmer than two pairs of very heavy woolen draw- 
ers he had been wearing, and that he did not feel the cold in the slightest 
degree. We found it washed as well as any woolen goods, and did not 
shrink. I am fully convinced of the excellent qualities of your goods, and 
find them doing good service. I will request the other officers to report to 
you also. 
Very respectfully, 
John H. Page, Maj. U. S. A. U. S. Army and Navy Reports. 
71 
FORT MEADE, DAK. 
CAPT. F. M. McDOUGALL, 7th Cavalry, U. S. A. 
Fort Mead Dak., Nov. 26 ’886. 
Mr. J. Jaros, Chicago, 111. 
Dear Sir:—The Fleece Underwear of your make is fulfilling everj ex- 
pectation, and I am personally also deriving the benefits and enjoying its 
wear. Respectfully, 
F. M. McDougall, Capt. U. S. A. 
OFFICE A. A. QUARTERMASTER. 
Fort Yates, Dak., 4,12,1887. 
J. Jaros, Esq., Jaros Hygienic Underwear Co., Chicago, 111. 
Dear SirI can assure you that I am only too happy to furnish you 
all information you desire relative to your heavy underwear. I have been 
in this country for several years and have tried ail grades of heavy fabric, 
never found any to meet my wants until I got your goods. Your heavy 
underwear can in no way be surpassed. I have been out in the hardest 
blizzards known in this country, with the wind at 29 miles, and the mercury 
at 46 and 47 degrees below zero, but found myself comfortable; felt a warm 
glow of the skin at all times, and I find it washes as well as any ordinary 
woolen wear, and does not shrink. I am fully convinced of the excellent 
qualities of your goods, and find that a great many of my friends and 
others are very anxious for winter to come again so that they may order. 
As I find it a protection against all diseases during the cold and damp 
seasons, having proven this last winter, I will request many of my com- 
rades to report to you also. 
I am, Sir, yours very respectfully, 
Peter Prilling, U. S. A. 
U. S. NAVY, PAY INSPECTOR’S DEPARTMENT. 
U. S. Naval Academy, 
Annapolis, Md., Feb. 23,1889. 
GentlemenI cannot refrain from expressing to you the great satis- 
faction and enjoyment I have received from the use of your Jaros Hygienic 
Underwear during the past winter. I have been almost free from rheu- 
matic pains, from which I have heretofore suffered greatly, and also 
enjoyed an except/on from severe colds, which is a very unusual luxury 
with me in the winter season; all of which I must attribute to the protec- 
tion afforded by my Hygienics. I am also gratified to find that with the 
proper care in washing there is no preceptible shrinkage. Tn short, in 72 
Street Railway Companies. 
every way, I find them the most desirable article I have ever seen for the 
object to be attained. 
1 shall be so loth to part with them that 1 hope you will manufacture a 
lighter grade for summer wear. 
You are at liberty to make any use you may see fit of my testimony. 
Very truly yours, 
Thos. T. Casw'ell, 
Pay Inspector U. S. Navy. 
CHICAGO CITY RAILWAY CO. 
C. B. HOLMES, Pres’t and Supt., 
2020 State Street, Chicago, March 2,1889. 
GentlemenThe “Jaros Hygienic Underwear” has been in use with 
Conductors and Gripmen of t his Company since November 1886, having 
been recommended by the Company’s Surgeon, Dr. D. A. K. Steele. We 
speak for the men in asserting that this underwear is considered the best 
possible protection against cold and changeable temperatures, which are 
especially characteristic of this latitude, and its use has resulted in great 
protection of health and a corresponding increased efficiency. With con- 
ductors, whose occupation necessarily prevents the wearing of a very 
heavy overcoat, it is of great advantage, and gripmen and dr vers are en- 
abled to thoroughly protect themselves in their exposed positions without 
an overplus of clothing, otherwise necessary. 
The proper protection of men serving in Street Railway Companies is 
of the greatest importance; since an efficient service in tlying weather is 
largely dependent on their prompt response. We have been pleased to 
secure for our employees a contract figure on the “ Jaros Hygienic Under- 
wear,” and feel that the benefits fully justify us in our continuance of this 
arrangement. Respectively yours, 
C. B. Holmes, Supt. 
D. A. K. STEELE, M. D., Surgeon and Consulting Physician, Chicago City 
Railway Co., Ex-President Chicago Medical Society, Prof. Orthopedic 
Surgery, College of Physicians and Surgeons of Chicago, etc. 
J. Jakos, Esq., Chicago. Chicago, January 6,1886. 
My Dear Sir:—I have critically examined and practically tested the 
Jaros Hygienic Wear,” and consider it the best fabric with which I am 
acquainted, for retaining the animal heat, and preventing chilling of the Railroads.—Brotherhood Firemen. 
73 
body by sudden changes of temperature. I consider the heavy wear espe- 
cially valuable for car drivers, firemen, policemen, or those whose occupa- 
tion expose them co stantly to the inclemency of the weather. 
Through my suggestion to the officials of the Cable Railway Company, 
many of the Grip Drivers and Conductors are already using this wear with 
the greatest satisfaction, lessening their risk of “taking cold,” and better- 
ing heir health and efficiency. 
Very truly yours, 
D. A. K. Steele, M. D. 
WEST CHICAGO STREET RAILWAY CO. 
CHAS. F. NAGL, Superintendent. 
Chicago, March 4, 1889. 
GentlemenThe good reports from Drivers and Conductors of our 
Company who are wearing the “Jaros Hygienic Underwear,” satisfies us 
that the arrangements made for last season's delivery of the wear have 
been appreciated. 
The excellent protection under every change of temperature during the 
winter months, guards against attacks so frequent with men exposed, of 
rheumatism, kidney disease, and pulmonary troubles, and all character of 
ailments resulting from colds. This is too often cause for irregularities 
with men, which is a loss to them and often an inconvenience to the Com- 
pany. 
We believe the underwear good, and just the thing for the purposes it 
is advocated. Respectfully, 
Chas. F. Nagl, Supt. 
F. P. SARGENT, Grand Master. 
Grand Lodge Locomotive Firemen ol North America, { 
Terre Haute, Ind., March 5,1889. j 
Jaros Hygienic Underwear Co., Chicago, 111. 
Gentlemen:—I take pleasure in recommending the Hygienic Under 
wear. I have been wearing it constantly for the past two winters and I 
find it not only conducive to comfort but to good health, and I recommend 
it heartily to any one who desires to be free from chills and rheumatism 
and to those who are exposed to sudden changes of climate. Railroad 
men will not only find that the Jaros Underwear gives them comfort but 
also good heilth. 
Yours truly, 
F. P. Sargent. 74 
Railroads.—Brotherhood Firemen. 
EUGENE V. DEBS, Grand Sec’y and Treas. 
Grand Lodge Brotherhood of Looomotive Firemen. 1 
Terre Haute, Ind., Feb. 12, 1888. j 
Jaros Hygienic Underwear Co., Chicago, 111. 
GentlemenAfter two years’ experience with your Hygienic Under- 
wear I take great pleasure in bearing testimony to its worth. It is all you 
c’aim for it and I conceive it to be just what every railroad man in the 
train service should be equipped with, if he has a prudent appreciation of 
health and comfort. 
Yours very truly, 
Eugene V. Debs. 
ILLINOIS CENTRAL RAILROAD COMPANY. 
Office of General Western Passenger Agent, 1 
Manchester, Iowa, October 6, 1888. j 
Jaros Hygienic Underwear Co., Chicago. 
Gentlemen1 am not in the habit of giving as a rule 
am opposed to anything of the kind, but after suffering from rheumatism 
and kindred diseases for several winters, I was persuaded by a friend to 
try Hygienic Underwear, and I am compelled to say that from the time I 
began using them last November until spring I did not have a touch nor 
a single chill during the entire winter, and I am confident that it was 
attributable to the use of your Underwear, and I have not. hesitated to 
recommend them every opportunity. 
*********** 
Yours truly, 
J. F. Merry, 
Great Western Passenger Agent. 
J. F. MERRY, General Western Passenger Agent, Illinois Central Rail- 
road Company, 
Office of General Western Passenger Agent, t 
Manchester, Iowa, May 7,1887. f 
J. Jakos, Esq. 
My Dear Sir:—I have worn the “Jaros Hygienic Underwear” nearly six 
months. Have not had a cold during the time, nor a sense of chilliness 
even during the coldest weather. My Catarrh has scarcely troubled me at 
all during the winter, and I would not be without these suits were the cost 
ten times what it is. You are atliberty to say to railroad men, and others 
exposed in extreme changes of climate, that they cannot afford to be 
without the “Jaros Hygienic Underwear.” 
Yours truly, 
J. F. Merry. Railroads.—Officials. 
75 
Preceding this, Mr. Merry wrote a friend in Dubuque, dated 
Manchester, Ia., Dec. 1,1886. 
Going home yesterday to dinner, I found awaiting me a suit of under- 
wear, and I was not very long in putting myself inside of them, but with 
no idea that I could wear them, having tried almost everything that con- 
tained wool, but never having found a garment I could wear next to my 
skin containing a particle of wool. I have worn the suit for two days 
without an unpleasant sensation; on the contrary, they are delightful, and 
just what I needed. 
Please have the following order filled for me. 
********* 
Yours truly, 
J. F. Merry. 
MISSOURI PACIFIC RAILROAD CO. 
W. R. OUTTEN, Chief Surgeon Missouri Pacific R. R. Co., Dean Beau- 
mont Hospital Medical College. 
St. Louis, October, 1887. 
Approved and recommended for use by the Engineers, Firemen and 
Brakemen of the Missouri Pacific Railroad Co., by W. B. Outten, M. D., 
to A. "VV. Dickenson, Esq., Superintendent. 
BALTIMORE & OHIO RAILROAD CO. 
R. HARVEY REED, M. IX, Surgeon Chief, Baltimore & Ohio R. R. Co., 
Secretary State Sanitary Association, Ohio. 
Mansfif.ld, O., March 9,1889. 
Mk. J. Jaros, Chicago, 111. 
Dear Sir:—From personal experience I find your underwear the most 
comfortable and the best safeguard from taking cold of anything of the 
kind I have ever seen. 
I have no hesitation whatever in heartily seconding it for Railroad 
employes, Police and Fire Departments, as especially well suited for 
their use, or any person exposed to the sudden changes of the weather in 
our climate. 
Yours very truly, 
R. Harvey Reed, M. D. 76 
Reports R. R. Engineers, Etc. 
EXECUTIVE COMMITTEE, LEGISLATIVE BOARD. 
Brotherhood of Locomotive Engineers, 
Marshalltown, Iowa, April 9,1889. 
J. S. MILLARD, Secretary. 
Jaros Hygienic Underwear Co., Chicago, 111. 
Dear Sir:—I received your Bowel and Kidney Band, which I put on 
promptly, and wore it until a few days ago. To say with flattering results, 
would be putting it mild. 
Away with electric belts, etc.; what we Locomotive Engineers want is 
better, and the proper material in such protectors for our bowels, kid- 
neys and lungs, which are constantly exposed to improper currents of air. 
Since wearing your Bowel and Kidney Band I have had fewer colds 
and aches than previously, through our severe Iowa winters. I cheerfully 
recommend it to brother Engineers as filling a long felt want as a restora- 
tive to weak backs, sore lungs, etc. With best wishes for your success, I 
remain, 
Very respectfully yours, 
J. S. Millard. 
THE WABASH & WESTERN RAILWAY OO. 
Office General Master Mechanic, 
Moberly, Mo., April 13,1889. 
Jaros Hygienic Underwear Co., Chicago, 111. 
Dear Sir1 find that your Kidney and Bowel Bands gave general sat- 
isfaction to our men who have used them, and hand you enclosed several 
testimonials. For myself I will say I am greatly pleased with the result of 
wearing the Band. I find that I am not troubled with a very annoying 
pain in side and back when wearing the Band. I like it very much, and 
shall next winter provide myself with Bands and Underwear of the same 
quality. 
Yours truly, 
A. W. Quackenbush, General M. M. 
WABASH & WESTERN RAILWAY CO. 
Moberly, Mo., April 10,1889. 
To A. W. QUACKENBUSH, General M. M. 
Dear SirReplying to your attached note, will say that I have been 
wearing the Bowel Bands for the past three months, and I think they have R. R. Engineers, Surgeons. 
77 
done me considertible good, and I can safely recommend them to other 
Engineers having cause to use them. 
Yours truly, 
Gho. Hagek, Engineer. 
WABASH & WESTERN RAILWAY CO. 
Mobkrly, Mo., April 15, 1889. 
A. W. QUACKENBUSH, M. M. 
Dear SirIn regard to the Bowel and Kidney Band I will say, I have 
given it good use, and think it is doing me much good, as I have had no 
trouble with my kidneys since wearing it. 
Yours respectfully, 
W. L. DuBois, Engineer. 
Many other reports confirm the above. 
SWITCHMEN’S MUTUAL AID ASSOCIATION, 
OF NORTH AMERICA. 
OFFICE OF THE GRAND DODGE, 
E. P. MURDOCK, M.D., Grand Medical Examiner. 
Chicago, 111., January 4th, 1890. 
Dr. I. Jaros. 
I have very carefully examined and tested the ‘‘Jaros Hygienic Wear," 
and I find it the best hygienic wear manufactured. It is so constructed as to 
conduct the moisture away from the body, thus retaining even temperature, 
and preventing chilling of the surface by sudden changes. 
The heavy will be especially adapted to switchmen and other railway em- 
ployees who are greatly exposed to the weather where cumbersome overcloth- 
ing is not only undesirable, but positively dangerous, as such heavy outside gar- 
ments impede their movements, and thus place them in danger of accidents. 
I especially recommend this wear to railway employees as a means of com- 
fort, safety and health. 
Very truly, 
E. P. Murdock, 
Grand Medical Examiner, 
Switchmen’s Association. 78 
PAUL BOYTON, World Famed Swimmer. 
634 Cleveland Avenue, 
Chicago, April 3, 1890. 
Dear Sir :—You are acquainted with the history of my accidently learning 
of your underwear, and know the many doubts I had while purchasing. I 
have given the garments the severest tests possible to satisfy myself whether 
the goods were really what I so much needed, and would hold out in the claims 
you made. 
I have bought the best woolen and heaviest silk underwear in prominent 
cities where I have travelled, abroad as well as in this country, with the 
special view of getting something that would protect me while in my rubber 
dress, on the long, cold and damp voyages I make. The exercise and heavy 
rubber suit which I wear often cause active perspiration, and my observation 
has been that from one to one and a half pounds of moisture is thrown off dur- 
ing an exhibition lasting from one and a half to two hours. With all other 
kind of underwear, this moisture was taken up only partially, the garments 
becoming thoroughly wet, and causing a chilling which was always hard for me 
to overcome; in fact, after these aquatic exhibitions, I found it absolutely neces- 
sary to be well rubbed to draw the blood to the surface and produce reaction, 
to prevent trouble, 
I speak of other underwear to give you an idea of this action, and the dif- 
ference in the body under trying conditions. 
Your wool I found admirably selected and prepared, and so incorporated to 
act quickly and absorb the moisture thrown off. 
My experience is that the “Jaros Hygienic Underwear" does not only 
relieve the body of perspiration, but also carries it to the cotton framework 
outside, which thoroughly retains it, thereby keeping the wool inside perfectly 
dry. 
Since I began to use the underwear, I have never felt the chilling which 
had always affected me with other underclothing, and I do not find rubbing 
after an exhibition necessary. 
I have no trace of rheumatic pain, and I feel physically much better. The 
difference in the amount of perspiration seems to me marked, which I attribute 
to the fact that the body temperature remains more nearly the same. I am so 
well pleased with your underwear, that I use it for general wear as well, and 
find every point you have claimed to be realized in its use. In conclusion, I can 
say, that your underwear is a boon and blessing to men exposed as sailors, fire- 
men, soldiers, and as well as the general public. Wishing you the success you 
deserve, 
I remain, yours very respectfully, 
Paul Boyton. 79 
We refer with permission to the following chiefs of 
Fire Departments, who use and recommend this wear 
for its value in Department service : 
Chief Hughes ... Fire Dep't, Louisville, Ky. 
“ Lemoine - - “ Grand Rapids, Mich. 
“ Evans - - - “ Pittsburgh, Pa. 
“ Stettson - “ Minneapolis, Minn. 
“ Fowley - - - <* Milwaukee, Wis. 
“ Lindsay - - “ St. Louis, Mo. 
“ Bentley - “ Eaton Rapids, Mich. 
“ Kiersted - - “ Newark, N. J. 
Etc., Etc., Etc. 
R. R. SURGEONS. 
The following Surgeons have recommended the “Jaros Hygienic 
Wear” to the employees. 
DIt. J. W. JACKSON, Kansas City, Mo., Chief Surgeon. Wabash & 
Western R. R. Co. 
DR. R. HARVEY REED, Mansfield, O., Chief Surgeon. Baltimore & 
Ohio R. R. Co. 
DR. W. B. OUTEN, St. Louis, Mo., Chief Surgeon. Missouri Pacific R. R. 
Co. 
DR. J. R. MURPHY, St. Paul, Minn., Chief Surgeon. Northern Pacific 
R. R. Co. 
DR. W. R. NUGENT, Oskaloosa, la., Chief Surgeon. Central Iowa R. R. 
Co. 
DR. J. W. SANDERS, Broken Bow, Neb., Chief Surgeon. Chicago, Bur- 
lington & Quincy R. R. Co. 
And others.