44 



Animal Intelligence 



tions are easy for an animal to form, and what are hard. 

 The act must be one which the animal will perform in the 

 course of the activity which its inherited equipment incites 

 or its previous experience has connected with the sense- 

 impression of a box's interior. The oftener the act nat- 



\ 



X, = b: 



l 



14 



20. 



FIG. 5. 



urally occurs in the course of such activity, the sooner it 

 will be performed in the first trial or so, and this is one con- 

 dition, sometimes, of the ease of forming the association. 

 For if the first few successes are five minutes apart, the 

 influence of one may nearly wear off before the next, while 

 if they are forty seconds apart the influences may get sum- 

 mated. But this is not the only or the main condition of 

 the celerity with which an association may be formed. It 

 depends also on the amount of attention given to the act. 

 An act of the sort likely to be well attended to will be learned 



