BEHAVIORISTIC STUDY OF THE RAT 
49 
large enough to permit the rat to enter and to get at the food, 
but too small to permit of very much sniffing or moving about. 
This arrangement was quite successful. It was possible to 
veiify this by actual observation over rather long periods of time, 
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Fig. 22. Photograph of Double Cage 
after the animals had had a good chance to accommodate them¬ 
selves to the particular form of cage. After the first day in the 
double cage, they rarely, if ever, entered the food box when just 
generally active and sniffing about. When they did enter they 
seemed to do so solely for the purpose of getting food. 
