ADAPTATIONS TO DESEETS 



CALORIES EVAPORATED 

 CALORIES PRODUCED 



Figure 3. The relation of evaporative cooling to metabolic heat production in the 

 Poor-will exposed to various ambient temperatures. The calculations assume that 

 the consumption of one cc of yields 4.8 calories and that the evaporation of one 

 mg of water requires 0.58 calories. 



427 



