260 EDWARD J. KEMPF, M. D. 



the other hand every monkey is fond of sticking his fingers into 

 places where he cannot see what he touches. 



For three months, in which time the problem was placed 

 before the monkey from about a quarter of an hour to an hour 

 at a time on an average of three times a week, D and E were 

 unable to get anything out of this box. Although they had 

 innumerable opportunities to watch and did watch very closely 

 while in the presence of A, B, C, or F, or several, or all of them, 

 or when by themselves. They also tried to solve the problem 

 when alone. It is perhaps needless to add that they were 

 urged to do so by the odor and sight of many tempting fruits, 

 nuts and vegetables, during states of great, little, or no hunger 

 and they were unable to learn. Their efforts to reach into 

 the box at times were perfectly ridiculous and grotesque. They 

 would twist themselves into the most awkward positions, even 

 for a monkey, stand on their hands, pushing their faces into 

 the aperture and hold to the wires with their hind feet, almost 

 standing on their heads, or climb up the wires backwards, turn 

 their backs to the food and try to reach it, twist themselves 

 around and around in a circle, call for the food, get angry, 

 punish the other monkeys and what not. 



They were helpless and would probably have starved if their 

 struggles for food had been the sole means of living. 



They learned to snatch food from the other monkeys and 

 when this failed, at times they would sit by the box and shake 

 it back and forth or drive the other monkeys away. D and E 

 would often sit by the aperture and watch another monkey 

 reach for the food and then snatch it as he drew it through 

 the aperture. F then adjusted to this by pressing his face 

 into the aperture and pushed the nuts into his mouth without 

 raising his head. When he had several in his pouch he would 

 then dash away. 



B would frequently grab food out of the box and dash to the 

 top of the cage and eat it. E would cautiously climb up to get 

 near enough to grab him. As soon as E would be far enough 

 from the box B would dodge him, dash to the box, grab food 

 and be away before E would get back to the box. Occasionally 

 B would make an enticing chuckling sound to E which was 

 very similar to the sound made when wishing sexual play. This 



