28 



PHYSIOLOGICAL REGULATIONS 



almost nothing. The speed of drinking and the sudden cessation 

 are equally dramatic. 



When the loads or deficits of water (AW) are correlated with 

 the amounts ingested in the first 5 minutes (SW/At), a linear rela- 

 tion or regression is obtained (fig. 11). 



T5 



CS 



o 



-J 



£. 



Hour 



Fig. 10. Amounts of water ingested (% of Bo) following the establishment of 

 diverse negative water loads. Forty-one tests on 3 dogs are averaged in groups of 8 

 taken in order of load established. Drinking is at top speed until the control body weight 

 is regained. Additional data of Adolph ( '39a) . 



Gains by the oxidative path are independent of water content, 

 so far as is known (data of Straub, 1899). Even in the extreme 

 states of deficit no augmentation of rate of oxidation appears to 

 occur. This is a matter for measurement, for no argument that 

 hydrogen is or is not too expensive to turn into mere water, is 

 logic so convincing as the dog's metabolic actions. 



