Abstract
Men entered a hot room (122[degree] F, 10% humidity) and sat on a Sauter balance. Within the 5 mins. before weighings of the men commenced, evaporation had increased 21/2 fold. Two subjects differed in the further acceleration of sweating above the steady initial increase; one delayed 7 mins. from the beginning of exposure, the other delayed 12 mins. In 20 mins. maximal rates, about 10 fold those in cool atmospheres, were attained. No relation was found between promptness of onset of sweating and the individual''s tolerance to heat or his acclimatization to heat. The slow onset of full sweating suggests that the stimulus required is an appreciable increase in the heat content of the whole body.

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