NERVOUS SYSTEM OF VERTEBRATES. 8 1 



first in direct line with the cord, begins to bend more 

 and more until it is at right angles in man ; (2) the cere- 



Fig. 52. — Mammalian stage. 



bellum has been increasing in relative size ; and (3) the 

 convolutions of both the cerebellum and the cerebrum 



Fig. 53. — Human stage. 



have been becoming more and more complex. All these 

 changes are combined and represented in Fig. 54. 



