98 



PHYSIOLOGICAL KEGULATIONS 



tion being measured without reference to any recognized stimulus. 

 Instead they are correlated with water load ; alternatively, load can 

 be inferred to accompany some unknown stimulus, as is frequently 

 imagined. 



Gain of water by oxidative production is not modified by deficits 

 of water in the body as indicated by the rates of basal oxygen con- 

 sumption (on 7 days of deficits ranging from - 1.5 to -4.9 AW, in 

 3 tests of Pinson and Wills). 



In water privation the rates of water loss diminished signifi- 

 cantly below those in states of water balance, when ascertained on 



Water Load 

 Fig. 59, Eate of water drinking (% of Bq/O.S hour) in relation to water load or 

 deficit (% of Bo). Intakes were each measured in the first 0.5 hour of drinking ad 

 libitum at the end of a period of weight loss. A, regression line representing the group 

 means (X) of 44 tests (10 individuals). B, line representing the 11 tests (Q) at 

 -AW>2, in the hot desert (7 individuals). C, line representing the 10 tests (A) at 

 -AW>2, in winter laboratory conditions (4 individuals). D, group of 12 tests (•) 

 following physical exercise (1 individual). E, hypothesis that 8W/At=:-AW. New 

 data. 



constant diet in 24-hour periods (Dennig, 1898, 1899; Newburgh 

 and Johnston, '34). The diminution prevails also for urinary loss 

 alone. It holds further for evaporative loss alone, in periods of 

 measurement lasting 0.2 to 3.0 hours (fig. 60). During the first 

 few hours of recovery by drinking, only variable and insignificant 

 modifications of those urinary rates and evaporative rates are 

 found. 



