NUMEROUS investigators have studiedthe physiological reaction of adults to specific temperature,.humidity,and other vari- able climatic conditions (1, 2).These studies, initiated primarily by the U. S. Armed Forces, have been concerned largely with man's com- fort, efficiency, or survival in the desert, arctic, or other places with severe climatic conditions.There have been a few investigations of the physiological response of children to heat stress under laboratory (3) and normal living con- ditions (4, 5), but data are too limited to de- scribe adequately the influence of climatic fac- tors on the amount and kind of fluid consumed by this group.Interest in the physiological response of children to climate increased markedly with the advent of community water fluoridation.Epidemiological studies in natural fluoride areas have shown that 1 p.p.m. fluoride repre- sents the optimum level for dental caries con-
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Galagan et al. (1957) studied this question.