TO THE LOWER ANIMALS 



279 



CJt im pct.nae f. 



FIG. 20. 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 of the cast of a Chimpanzee's skull, 

 which illustrates the paper by Mr. Marshall ' On the Brain of the 

 Chimpanzee' in the Natural History Review for July, 1861. The 

 sharper definition of the lower edge of the cast of the cerebral chamber 

 in the Chimpanzee arises from the circumstance that the tentorium 

 remained in that skull and not in the Man's. The cast more accurately 

 represents the brain in Chimpanzee than in the Man ; and the great 

 backward projection ol tlie posterior lobes of the cerebrum of the 

 former, beyond the cerebellum, is conspicuous. 



