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September 2, 1922


JAMA. 1922;79(10):827-828. doi:10.1001/jama.1922.02640100047017

That sunlight is beneficial to those forms of living matter represented by green plants is an every-day observation. Through the intermediation of chlorophyl, light energy is stored under conditions most advantageous to mankind. There is a widespread conviction that sunlight is health-giving to man as well as to vegetation; but proof of this traditional belief is not so easily secured. Sunlight is only one of numerous environmental factors to which the human organism is subject, and they cannot readily be dissociated so that each can be charged with its specific responsibility for well being or the reverse, as the case may be. The physics of radiation, including the phenomena of light rays, has progressed to a stage, however, at which it may be expected that the behavior of light to living matter in the animal as well as the plant kingdom will become elucidated. A recent writer1 has pointed

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