_For Sale by_ Eagle Clothing Company, No. 52 North Main Street, CONCORD, N. H. [Illustration: Prof Dr. Pettenkofer _Director of Hygienic Institute, Munich._] JAROS HYGIENIC WEAR THE THERAPEUTIC AND PROPHYLACTIC APPLICATION. BY I. JAROS. WITH ILLUSTRATIONS. NEW YORK. JAROS HYGIENIC UNDERWEAR CO., 52 EAST 10TH STREET. COPYRIGHTED BY THE JAROS HYGIENIC UNDERWEAR CO. 1890. FOURTH EDITION. To the learned gentlemen of the Medical 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, I. Jaros NEW YORK, 1890. Contents Introductory Section Hygienic Clothing Philosophy of Clothing Hygienic Underwear Testimonials 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. [Illustration: 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. [Illustration: MAGNIFIED--COTTON FIBRE.] [Illustration: 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.