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- 

 torium a sort of parchment-like shelf, or partition, which, 



Chimpanzee. 



I FIG. 21. Drawings of the internal casts of a Man's and of a Chimpanzee's 

 kull, 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 



