CHAPTER V THE HYGIENIC VALUE OF ARTIFICIAL SILK CLOTHING HIS is a new subject. As yet, there is no book on it. So far as I know, this is the first article that has ever been written on the hygienic value of Artificial Silk clothing. r— Here is the great new Fact upon which this chapter is based—THE ULTRA-VIOLET RAYS OF THE SUN DO NOT GO THROUGH COTTON, WOOLLEN, LINEN OR REAL SILK CLOTHING, BUT 50 PER CENT. OF THEM GO THROUGH ARTIFICIAL SILK CLOTHING. The Ultra-Violet rays, which are necessary in order to have perfect health, do not go through ordinary glass. We are now making a special new kind of glass that allows them to ‘go through. They do not go through 8g