148 MAN AND APES. 



Again, much stress has been laid, by some 

 writers, on the great relative extension back- 

 wards of the hinder parts of the cerebrum and 

 cerebellum in man. But in the little Squir- 

 rel Monkey of America the cerebrum extends 

 backwards beyond the cerebellum, much more 

 than it does in ourselves, while in that re- 

 markable species of Hylobates — the Siamang 

 Gibbon (which is so man-like in its chin, and 

 which exceeds man in the breadth of its 

 sternum) — the cerebrum is so short as to 

 leave the cerebellum very decidedly uncovered 

 at its hinder part, In the Howling Monkeys, 

 again, this exposure of the cerebellum is yet 

 greater, and nevertheless these monkeys be- 

 long to a familv in which, as we have seen, 

 the overlapping of the cerebellum by the 

 cerebrum attains to its maximum of develop- 

 ment, 



Yet the psychical powers of different apes 

 are very similar. Not only the lowest Baboons 

 of Africa (as, e.g., the famed " Happy Jerry " 

 of Exeter Change) can be taught various and 



