Abstract
THIS study was intended to test in mammals the concept that some animals have a potential physiological limit of energy which may be utilized at different rates depending upon environmental temperatures. McArthur and Baillie1 were able to triple the life-span of Daphnia (Crustacea) by a 20-deg. drop in temperature. The total heart beats during the life of the Daphnia differed by less than 2 per cent whether the duration of life was a few days due to high temperature or several months due to low temperature. Similarly, Carlson and Hoelzel2 prolonged the life-span of white rats by reducing their metabolism by partial starvation.
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