JAMA. 1928;90(7):547-548. doi:10.1001/jama.1928.02690340049021.
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In 1926, D. F. Smiley suggested the possibility of relating the winter and spring incidence of colds to two factors other than atmospheric temperature. One of these was the seasonal deficiency in vitamin intake; the other, a disordered vitamin metabolism in the body brought on by lack of solar radiation. Later, Maughan and Smiley1 performed experiments to determine the effect of ultraviolet radiation in preventing colds. The idea, as they stated, was not original with them. Several investigators in Europe and America had given attention to similar problems. Of these, Barenberg, Friedman and Green2 did not obtain desirable results. Their infant subjects improved in general health during the first month of treatment but contracted an increased number of colds during the second, third and fourth months. The dosage of ultraviolet radiation to which the children were subjected was worked up to thirty minutes on alternate days. Barenberg and


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