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.

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.

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."

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.

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

Added to these statements are many more in this Treatise.

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.

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.