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March 28, 1931


JAMA. 1931;96(13):1088-1089. doi:10.1001/jama.1931.02720390098010

So much is said nowadays about the dearth of sunshine and its consequent detriment to human well being that it is interesting to discover some of the regions where nature's beneficent sun rays are always available in abundance. The existence of seasonal variations and their effects on the incidence of infantile rickets have been repeatedly stressed in recent years. For example, Tisdall and Brown1 found the antirachitic effect of sunshine at Toronto in April and May to be approximately eight times as great as in December, January and February. Day2 recently reported a seasonal variation in the antirachitic potency of Arkansas sunshine. He found that whereas an average daily exposure to sunshine of ten minutes over a period of forty days during June and July was sufficient to induce calcification in rats fed a rachitogenic diet, incomplete protection against rickets resulted from two and one-half hours' daily exposure

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