74 VOICE AND ^'language" OF CHIMPANZEES 



He was very subdued, whining but a single tone: 



■^ 



f 

 57 m 



But judging by thumps and other noises that emanated from 

 the room he was busily working. 



When Dr. Y. went in to change the arrangement of the 

 apparatus Chim uttered a loud bark: 



ro 



58 '"^^^ 



(See no. 97-107 for Chim's behavior immediately after this 



experiment in which he made up for the long period of quiet.) 



Another experiment, after the oatmeal course, in which he 

 was successful in piHng up boxes to reach a banana that was 

 suspended above him. He was silent in striking contrast 

 to the first experiment which seemed to be a long difficult 

 experience. 



Again alone during the experiment he uttered a single 

 phrase: 



in 



J^^ 



m 

 59 



PANZEE WAITING FOR FOOD 



The opening of the wooden outer door of the chimpanzees' 

 sleeping room was the first thing on their day's program. 

 The inner door was a heavy wire screen which served as pro- 



