Although our knowledge of the regulation of body temperature and its relation to metabolism has reached a stage at which an intelligent appreciation of many of the factors involved can be formulated, there are features of the heat-controlling mechanism that still demand elucidation. In several respects the climatic conditions that prevail in the tropics have furnished greater obstacles to the comfort of man than have the severe rigors of arctic surroundings. The problems of climatology in the tropics have become emphasized by the growing necessity of the white man's residing there and adjusting himself to the situations created by wind and weather. By some writers, tropical sunlight has been endowed with properties peculiarly detrimental to human health and comfort. The effect of the ultraviolet rays on the skin in the familiar production of the inflammation called sunburn, erythema solare, is not directly associated with heat. Indeed, it is often said
ACCLIMATIZATION TO THE TROPICAL SUN. JAMA. 1917;LXIX(17):1430–1431. doi:10.1001/jama.1917.02590440040012
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