On the basis of the fluid intake study in Antioch and Brentwood, Calif., reported on pp. 484-490, Dr. Galagan and Mr. Vermillion, of the Public Health Service, have developed the method described here for determining optimum fluoride concentrations in water supplies. This method takes into account the effect of environmental temperature on water consumption among children.

NUMEROUS investigators have studied the physiological reaction of adults to specific temperature,.humidity, and other variable climatic conditions (1, 2). These studies, initiated primarily by the U. S. Armed Forces, have been concerned largely with man's comfort, 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 conditions (4, 5), but data are too limited to describe adequately the influence of climatic factors 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 represents the optimum level for dental caries con

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