324 



PHYSIOLOGICAl. EEGULATIONS 



intake but by suppression of output. However, in other tests, 

 moderately increased rates of intake are recorded by Maclagan 

 ('37). In another species, the dog, augmentations of intake occur 

 after each deficit (fig. 154) ; in still another, the rat, food missed is 

 never made up (fig. 155). 



Recoveries of net substance may be ascertained from body 

 weight alone (fig. 156). In all four species reported, the curves are 

 exponential and asymptotic. The velocity quotients are here in- 



Days 



Fig. 154. Increment of body weight (% of Bo), and relative rates of intake, in 

 relation to time during and after (A) total privation for 48 hours, (B) forced intake 

 by stomach. Dogs vrere allowed unlimited dry food and water except during the 48 

 hours. Amounts forced are indicated in block at lower right. Four tests on 3 indi- 

 viduals (A) and five tests on 2 individuals (B). New data. 



verse to the initial (administered) loads, and there is nothing to 

 indicate that they vary from species to species. 



Even when fed limited amounts of a constant diet, animals gain 

 body weight faster in the initial part of recovery from food deficit 

 than later, this gain corresponding to the greater retention (or the 

 lesser elimination) of substance (dog, Morgulis, '28). Hence re- 

 covery involves here, and in other known instances, decreased rates 

 of elimination ; anabolism proceeds with less wastage. 



During a single meal the rate of ad libitum food intake of the rat 



