CHAPTER II 

 Sounds Associated with Food 

 cmm waiting for food 



Early morning. When their room was first opened, Chim 

 gave an unique call. It was, perhaps, the most remarkable 

 of his utterances from the vocal standpoint, and consisted of 

 two tones, widely separated in pitch, but sounding simul- 

 taneously. This seems a strange phenomenon to one used 

 to the limitations of the human voice. The presence of two 

 ventricles, or sacs, in the throat which are much larger and 

 more flexible in the ape than in man serve to intensify the 

 voice and increase the volume. 



As indicated below, these tones were very loud, the upper 

 ones piercingly shrill and clear. The lips were drawn well 

 back showing teeth and gums. With this greeting he^held 

 out his arms in welcome, eager to be taken up. 



2* 



8va 



i 



f# 



I 



^ 



f — r 



1 



//I 



ae ae ae ae 



Morning. He began his call with the upper tones alone, 

 increasing the volume until he burst into the double tones. 

 These calls contain the most dissonant interval in musical 

 structure, the minor second (f sharp and g). They are three 



* 2 over 8 va. signifies two octaves above the notation. 



61 



