326 



-4Q 



Rabbit B 



PHYSIOLOGICAX. REGULATIONS 



1 1 1 1 — 



1 



40 



&> 



\^ 



160 



"200 Ete 280" 



Hours 



Fig. 156. Body weight load (% of Bo) in relation to time, during recovery in 4 

 species of mammals. All were previously deprived of food but allowed water; during 

 recovery, food was allowed generously but was probably artifically limited in some re- 

 spect in each experiment. 1 = half of load returned. Man, 2 individuals of Howe, 

 Mattill, and Hawk ('11). Dog, 5 individuals of Morgulis ('28 and '29). B and A, 

 rabbit, 8 and 6 individuals of Maclagan ( '37) as in figure 153. Eat, 11 individuals of 

 Hitchcock ('26, p. 216). 



Forced overfeeding has been less frequently studied. The rates 

 of recovery from it have now been ascertained. It is known that 

 combustions as well as excretions proceed more rapidly (specific 

 dynamic action, luxus consumption). Food is often refused (figs. 

 154 and 155) and absorption is said to be less complete. I find no 



-30 -20 



Total Substance Lood 



Fig. 157. Eate of intake of total substance or food (% of BoAour) in relation 

 to load of total substance or body weight (% of Bo). Eate of intake is given in terms 

 of the number of pellets of food eaten when the rat pressed a lever to obtain each one. 

 J, mean of 8 rats, K, mean of 5 rats, that were almost completely deprived of food until 

 the initial 1.0 hour in which the test was made. Data of Skinner ('38, p. 397). 



