WATEE EXCHANGES OP DOG 



29 



Drinking and absorbing are the counterpart of excreting. Gain 

 and loss are equivalent and symmetrical aspects of the recovery 

 and the maintenance of water content. To regard water intake 

 and water output as wholly separate functions of the dog is to 



-4 -L 



Water Load 



Fig. 11. Amounts of water ingested (% of Bo/0.08 hour) in relation to negative 

 total water load ( % of Bo) . The same 41 tests on 3 individuals as in figure 10 are indi- 

 cated, together with the regression of ingestion rate on load (solid line and open circles). 

 If the dogs had taken the exact amounts of the deficits, the dash line would have resulted. 

 The equation of the solid line is R = 0.28 - 1.073AW; of the dash line, R = -AW. The 

 coefficient of variation (with respect to ordinates) of the points from the solid line is 

 ± 32 per cent. Redrawn from Adolph ( '39a) . 



ignore their high (negative) correlation. The reproducibility, too, 

 of rate of initial drinking is just as high as of rate of urinary out- 

 put (§24). 



Diverse features concerned with water ingestion are quanti- 

 tatively known (table 1). Capacities of stomach and small intes- 

 tine, rates of emptying of stomach, rates of absorption, maximal 



