Ill 



RESULTS OF MULTIPLE-CHOICE EXPERIMENTS 



1. Skirri, Pithecus inis 



Problem \. First at the Left End 



Systematic work with the multiple-choice apparatus and 

 method described in the previous section was undertaken early 

 in April with Skirri, Sobke, and Julius. The results for each 

 of them are now to be presented with such measure of detail as 

 their importance seems to justify. 



Skirri had previously been used by Doctor Hamilton in an 

 experimental study of reactive tendencies. He proved so re- 

 markably inefficient in the work that Doctor Hamilton was led 

 to characterize him as feeble-minded, and to recommend him 

 to me for further study because of his mental peculiarities. 

 With me he was from the first frank, aggressive, and inclined 

 to be savage. It was soon possible for me to go into the large 

 cage, Z, with him and allow him to take food from my hand. 

 He was without fear of the experimental apparatus and it proved 

 relatively easy to accustom him to the routine of the experi- 

 ment. Throughout the work he was rather slow, inattentive, 

 and erratic. 



Beginning on April 7, I sought to acquaint him with the 

 multiple-choice apparatus by allowing him to make trips through 

 the several boxes, with the reward of food each time. Thus, 

 for example, with the entrance and exit doors of box 7 raised, 

 the monkey was allowed to pass into the reaction-compartment 

 E and thence through box 7 to the food cup. As soon as he had 

 finished eating, he was called back to D by the experimenter 

 and, after a few seconds, allowed, similarly, to make a trip by 

 way of one of the other boxes. By reason of this preliminary 

 training he soon came to seek eagerly for the reward of food. 



On April 10 the apparatus was painted white in order to in- 

 crease the lightness and thus render it easier for the experimenter 



