WATER 103 



evaporation. The manner in which evapora- 

 tion becomes important in temperature reg- 

 ulation is well illustrated by the following cal- 

 culation from a chart of Rubner's. 1 The 

 experiments upon which the chart is based 

 were made upon the dog, an animal which 

 lacks man's apparatus of sweat glands. The 

 values of the table are only approximate. 



In plants evaporation is even more impor- 

 tant than in animals. Evidently such adap- 

 tation of the physiological processes to the 

 conditions of the environment is enormously 

 favored by the high latent heat of evapora- 

 tion. 2 



1 Lusk, "The Science of Nutrition," p. 99. 



2 A full discussion of this subject will be found in the 

 work of Lusk (see above), Chap. Ill, especially pp. 98-100. 



