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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 therapeutics, 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 covered with epidermic scales which overlap each other. The 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.

This is fully verified by Krieger's experiments.

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 constructed that it will embody all scientific essentials. The first satisfactory material of the "Jaros Hygienic Wear" was laid before the Medical Profession in Chicago, November, 1884, and, guided by their suggestions, 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 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 reproduction of the natural pelt, is the preservation of 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 possibilities: 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 prepared 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 the consideration of a prophylactic measure this Underwear accomplishes the desideratum for protection.

L. D. Rogers, A.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 cotton 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 fabric, 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 dampness 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.

REPORT OF 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 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 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 Reports of Police and Fire Departments in our large cities, and from many Railway Corporations and Physicians.

THERAPEUTICS.—In the Therapeutics of Medicine the Underwear is regarded as specially indicated in Rheumatism, Kidney Disease (Bright's), and Pulmonary Consumption.

RHEUMATISM.

J. NEVINS HYDE, A. M., M. D., gives expression as follows:

"I have often employed the "Jaros Hygienic Underwear" in cases of muscular 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 WARMAN, M. D.

"One of my patients wearing the "Jaros 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."

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 54-55.

"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 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 hydroscopic 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 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," especially in renal and other diseases in which sudden changes of body temperature are hazardous. I think it will prove a valuable addition to our means of treating 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.

WOMEN'S COMBINATION SUIT.

Properly fitting garments are advised, and as an illustration 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.

MEN'S SUIT.

CONCLUSION.

In the summary of the results of practice with the "Jaros Hygienic Underwear" by U.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 Hygienic Wear," and the recognition earned, has prescribed utmost care in properly stamping the Wear to protect the Profession against possible misrepresentations.