32 



PHYSIOLOGICAL KEGULATIONS 



intake and an output. Their difference (net rate) is the rate at 

 which the water load is being removed. 



§ 9. Equilibration 



What quantitative account can now be given of the compensa- 

 tions for water loads? Since coordinates have the same dimen- 

 sions both in excesses and in deficits of water content, the data so 

 far considered may be combined on a common scale of water loads 

 (fig. 13). The first one hour since recovery started is chosen as 

 the interval of time in which rates of water exchange are measured. 

 To figures 9 and 11 are added values for total gain of water in 



+2 



Total Water Load 



+4 



Fig. 13. Bates of total water exchanges (% of Bo within the first 1.0 hour of 

 recovery) in relation to total water load ( % of Bo) in dog. Equilibration diagram. In 

 negative loads the data are taken from figures 11 and 12 ; in positive loads from figure 9 

 and from computed gain by oxidation. 



excesses (by oxidation, data of Heilner, '07) and total loss of water 

 in deficits (fig. 12) ; also figure 11 is corrected by means of figure 10 

 to yield data for another duration of time (1.0 hour) than that 

 originally considered. At the same time, the two diverse modes 

 of producing initially new water contents (privation, gastric ad- 

 ministration), one for negative loads, the other for positive, are 

 carefully labelled. 



In figure 13 the rates of water exchange (BW/At) are compared 

 with the coincidental water loads of the body (AW). This type of 

 diagram, always with coordinates of like dimensions, will often 

 recur in this investigation, and I therefore give it the distinctive 

 name (suggested by Dr. L. J. Henderson) of ''equilibration dia- 



