Glass and Glass Substitutes Pervious to Ultra-violet Rays
During the past very few years several makes of glass and glass-substitutes pervious to ultra-violet rays have been placed upon the market. The value of this discovery is twofold. It aids those in health resorts and curative institutions of various kinds to get well more quickly, and it is of tremendous %’alue
to those who are not ill, helping them to gain more health and energy than would otherwise be possible. Already some hospitals and sanitaria have provided some of their rooms, jjarticularly their solaria, with glass that lets in the life-giving actinic rays. Farmers, stock-raisers, and chicken-raisers have
used some of the glass-substitutes instead of ordinary glass for the buildings in which animals are housed, and have healthier stock, with greater production of milk and eggs, than under the old conditions. Even the reflected sunlight through such glass has proved to be of greater value than direct sunlight through ordinary window-glass. Factories and schools are now putting in window-panes of the new materials, with marked benefit to the occupants. Within a comparatively short time, let us hope modern dwellings and all other build¬ings in which people are housed will be provided with windows permeable to the ultra-violet rays. No more useful application of helio-hygiene and heliotherapy could be made.