TO THE LOWER ANIMALS. 



117 



trouble to make a cast of it. For there is a very marked 

 groove in every such skull, as in the human skull — which 

 indicates the line of attachment of what is termed the ten- 

 toriicm — a sort of parchment-like shelf, or partition, which, 



Man. 



Chimpanzee, 



Fig. 21. — Drawings of the internal casts of a Man's and of a Chimpanzee's 

 skull, of the same absolute length, and placed in corresponding positions, A. 

 Cerebrum ; B. Cerebellum. The former drawing is taken from a cast in the 

 Museum of the Royal College of Surgeons, the latter from the photograph 



