Abstract
Spontaneous activity of 2-day-old mice was measured at different body temperatures, and found to increase with body temp. up to 22[degree] C, and to decrease rapidly from 22[degree] to 25[degree], less rapidly from 25[degree] to 30[degree], and abruptly from 30[degree] to 33[degree]. Even at 2 days old, the mouse evidently exhibits a kind of regulation of its body temp.

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