Abstract
The action of substances affecting growth, both hormones and vitamins, has developed unique biologic contacts. The work of Hess 1 and others has shown the power of ultraviolet rays in imparting antirachitic properties to vegetable oils. It has further been demonstrated recently that ultraviolet rays have a destructive action on insulin. 2 In view of the increasing use of ultraviolet rays as a therapeutic agent, certain qualitative effects of these rays on the follicular hormone are reported here. The action of the follicular hormone includes the production of striking growth in the female genital organs. By injections of this substance into spayed rats and mice, it has been possible to induce a degree of growth in the genital tract equal to the maximum attained in the normal animal under the influence of its own ovarian secretion. 3 In further studies a standard rat unit has been adopted, consisting of the
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