1910–1911
Britannica 11th
Encyclopaedia Britannica · 11th edition
ANIMAL HEAT. Under this heading is discussed the physiology of the temperature of the animal body. The higher animals have within their bodies certain sources of heat, and also some mechanism by means of which both the production and loss of heat can be regulated. This is conclusively shown by the fact that both in summer and winter their mean temperature remains the same. But it was not until the introduction of thermometers that any exact data on the temperature of animals could be obtained. It was then found tha…
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- Vol. 2, pp. 48-50