38 



PHYSIOLOGICAL KEGULATIONS 



^ £ 



-H 

 O 



3 



o 



:^ 



Total Gain 



2i. 



Inqeftive 



Oxidative 



Z7- 



% 



-3 



Total Loss 



Insensible 



Urinary 



+4. 



+1 



Totral Water Load 

 Fig. 17. Velocity quotient (1/hour) in relation to total water load (% of Bo). 

 These velocity quotients are obtained by dividing eacli rate of exchange by load. Total 

 exchanges (derived from figure 13), and partitioned exchanges (derived from figure 14) 

 are represented. 



Single paths of exchange may also be represented (fig. 17). In 

 extreme loads the difference between values for total loss and for 

 urinary loss becomes negligible; in negative loads the difference 

 between values for total gain and ingestive gain is very small. 



The rule emerges that only that fraction of the exchange which 

 is modified greatly with load has values of velocity quotient that 

 approach constancy. Only the compensatory exchanges are readily 



I - 



-3 



■►I 



Total Water 



Fig. 18. Net velocity quotient (1/hour) in relation to total water load (% of Bo). 

 These velocity quotients represent rate of net water exchange divided by total water load. 

 Line GG', first 1.0 hour of recovery after single privations or ingestions of water (derived 

 from figure 16); line G'+, later times after single ingestion (derived from figure 6); 

 line HH', in steady water loads (derived from figure 29, below). 



described by the quotient; whenever it is constant, the rate of 

 exchange is approximately proportional to the excess or deficit that 

 prevails. This is a property that will be found to characterize very 

 many processes of recovery. 



In the dog velocity quotients are greater in negative increments 

 of water than in positive increments, the mean values of 1/At (net) 

 in the first hour of water equilibration being 1.33/hour and 



