566 THE HIGHER ANTHROPOIDS 



with the many exhibition performances which show a striking human 

 resemblance in their execution, would seem to indicate a wide range of 

 teachabihty on the part of the chimpanzee. \\ hether such exhibition per- 

 formances of the animal as are the result of training may be accounted as 

 properly within the definition of strict intelligence tests, is a question some- 

 what aside from the point. All of these feats of learning, however inter- 

 preted, manifest the degree to which the chimpanzee is able to expand its 

 behavioral performances. That the execution of such acts requires appro- 

 priate supervision and urging is certamly true, since the animal tends to 

 relapse into more primitive modes of reaction, without apparently having 

 gained any definite advantage for its own purposes of life from the many 

 additional accomplishments acquued under the tutelage of man. 



Brain" Measurements and Indices in Chimpanzee 

 The dimensions of the brain, including cerebellum and brain stem, are: 



Longitudinal loo mm. 



Transverse 88 mm. 



The following are the dimensions of the brain case: 



Total length of the skull igo mm. 



Occipito-nasal length 141) mm. 



Intertemporal width -2 mm. 



W idth of the brain case ()g mm. 



The total weight of the brain without the dura niatcr is 350 gm. 



Total w aler dis])laccnHnt 369 c.c. 



Weight of the forebrain 2C)8 gm. 



Weight of the midbrain 5 gm. 



Weight of the hindbrain 47 gm. 



