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1 From the Zoölogical Laboratory, Duke University
1. Amphibians show marked response in body temperature to environmental variations in relative humidity. When subjected to an atmosphere of 7 per cent relative humidity at 20° C., a depression of several degrees centigrade may occur in their body temperature.
2. Reptiles show very little response to variations in relative humidity. The integument apparently prevents the evaporation of moisture from the surface of the body.
3. It is suggested that the evolution of the scaly integument of reptiles from the slimy and moist skin of amphibians, with the concomitant power of water retention, is perhaps an important step in the evolution of homoiothermism.
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