14 
CURT P. RICHTER 
These experiments show that the rat is naturally inactive for 
a time after eating, and that it does not become active again of 
its own accord for several hours afterwards. These results bear 
out essentially the observations man has made on his own be¬ 
havior, for there is a general saying that it is not a good thing to 
Fig. 7. Curve Showing Distribution of Spontaneous Activity with Rela¬ 
tion to Time of Feeding 
For animals about forty days old 
