Abstract

An analysis of the daily temperature cycle in the chimpanzee (Pan niger) has been carried out based on a series of 194 rectal temperature measurements made in connection with tubercular thermal testing at the Philadelphia Zoological Garden. The cycles of increasing and decreasing body temperature were exponential and symmetrical, with an amplitude of 2.6–2.9°F (2–3 am → 2–3 pm) and a 24-hour mean of 99.0°F, or 98.7°F if the initial series on each individual was omitted. The S.D. of the 17 daily means was 0.53°F; and of the values at any single hour, 0.63°F.

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