535Dearborn Avenue . . . Chicago, Ill. Cable Address . . . . "Medic, Chicago" Subscription price . . . . . Five dollars per annum in advance [For other information see second page following reading matter] SATURDAY, SEPTEMBER 23, 1911 THE ACTION OF TROPICAL SUNLIGHT Modern investigation of tropical diseases has been so successful that in our enthusiasm we are apt to consider these as the only influences deleterious to life in warmer climates. It must be remembered, however, that the physical peculiarities of the tropics also have their effect on the animal economy—an effect the exact importance of which it is difficult to estimate. These various physical factors of a tropical climate are being studied, and A ron1in recent articles gives the results of his investigations on the effect of tropical sunlight on the living organism. It is obvious that sunlight in equatorial and subequatorial regions will be more potent than that of more temperate zones; for not
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A 1911 study studied this question.