MENTAL LIFE OF APES AND MONKEYS 



ing by imitating the experimenter's movements. In one 

 such case a piece of banana was suspended by a string a 

 little beyond the monkey's reach, and a pole was so ar- 

 ranged that when it was swung under the banana the 

 monkey could get upon it and reach the fruit. A monkey 

 which had proven himself incapable of solving the problem 



FIG. 18. Peter's efforts at copying letters on a blackboard, a. Two 

 superimposed letters drawn by Mr. Witmer ; a 1 , Peter's copy after the sec- 

 ond tracing ; a 2 , Peter's second effort when told to make a W again. (By 

 permisson of the Psychological Clinic.) 



alone was shown how to manipulate the pole. After wit- 

 nessing the experimenter push the pole under the banana 

 the monkey gradually learned to perform the act, although 

 it was some time before he manipulated the apparatus with 

 accuracy and dispatch. 



The most extensive study of imitation in monkeys has 

 been made by Mr. Haggerty. While many of the experi- 



18 



