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.