RATE OF GAIN AND LOSS OF COLD RESISTANCE IN MICE

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Abstract
The resistance time of white mice acclimated to 10 and 30 °C, was 1730 min. and 67 min. respectively when both groups were exposed to −17 °C. After shifting the 30 °C. mice to 10 °C. and the 10 °C. mice to 30 °C., the resistance time of the original 30 °C. mice at −17 °C. became approximately the same in five weeks as that of the original 10 °C. mice and vice versa. Change of resistance time was greatest in the first two weeks and it gradually declined thereafter. Rate of loss of resistance in the first week was greater than rate of gain in terms of resistance time at −17 °C., but appeared slightly less than rate of gain in terms of resistance temperature. In white-footed mice, several short (two- to three-hour) exposures to cold increased cold resistance.

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