SUNSHINE AND CLOTHING

In recent years much of the accepted efficacy of solar irradiation for the promotion of health has been attributed, as the result of careful scientific investigations, to the ultraviolet components of the sunlight. These rays, which represent only a small part of the energy involved, not only are singularly potent but also may be readily obliterated by various interposing mediums. They fail almost completely to penetrate ordinary window glass, through which ordinary light rays pass readily. Skyshine may contribute a considerable part of the desired effects of heliotherapy.¹ This is demonstrably true with respect to antirachitic potency.² It has become evident that in order to get maximal results from heliotherapy one must be assured that direct solar radiations, as well as those which are indirect or diffuse, are being received and that it is not necessary to discard all solarization because direct sunshine is not available. Leonard Hill