WATEE EELATIONS OF OTHER SPECIES 



133 



water by which it is deficient (fig. 80). The behavior is like the 

 dog's or rabbit's, and as precise; before the water has time to be 

 absorbed from the alimentary tract the drink has been accurately 

 completed. 



More variation is found among individuals with respect to total 

 water output in excesses than with respect to water intake in defi- 

 cits. After injection of excess water, all individuals lose weight 

 more rapidly, but large individuals show only small augmentations. 



+20 



Garter Snake 

 Thamnophis 



Fig. 81. 

 tilled water. 



30 40 



Hours 

 Course of water load (% of Bo) after the intraperitoneal injection of dis- 

 Garter snake. Six testa on 4 individuals, weighing 101, 73, 8 and 11 grams. 



l = half of administered load returned. New data. 



As a result, the large individuals take several days to recover their 

 original body weights (fig. 81). The expulsion of liquid from the 

 cloaca in place of the usual semi-solid excreta, indicates one path of 

 augmented output, perhaps the only one. 



For certain other genera of reptiles {Chrysemys, Anolis, 

 Phrynosoma, Alligator, Uta, Cnemidopliorus) a few new data con- 

 cern water deficits. In recovery all show sudden gains of water by 

 alimentary drinking. I recall how surprising the sudden and inter- 

 mittent gains seemed, after I had first measured the smooth and 

 gradual gains of frogs and toads. 



