THE VAPOR TENSION RELATIONS OF FROGS

¹ From the Physiological Laboratory, the University of Rochester School of Medicine and Dentistry

1. Frogs lose water by evaporation at rates that are nearly inversely proportional to the relative humidities of atmospheres.

2. Functioning of the central nervous system, of the blood's circulation, and of the skin made no significant differences in rates of evaporation.

3. In saturated atmospheres evaporation still goes on, which is explained by the fact that the production of heat keeps the body slightly warmer than the atmosphere.

4. In unsaturated atmospheres heat may be regarded as being lost by evaporation until the lowered temperature of the body comes into a steady state with the gain of heat by conduction, convection, and radiation from the surroundings.

5. No equilibrium of zero evaporation can be established for the living frog, and so the vapor tension of the frog's surface cannot be measured.

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