COMPARATIVE ZOOLOGY 



larger in the ape than in the lion, in the lion than in 

 the ox, in birds than in reptiles. The cerebellum of the 



FIG. 339. Brain of the Cat (Felis do- 

 mestica) : a, medulla oblongata; 

 b, cerebellum ; c, cerebrum. 



FIG. 340. Brain of the Orang-outang 

 upper surface ; one third natural 

 size. 



frog is, however, smaller than that of fishes (Figs. 336, 

 337). The olfactory and optic lobes receive the mes- 

 sages from their respective nerves. The medulla 

 oblongata is not only the me- 

 dium of communication between 

 the brain and the spinal cord, 



FIG. 341. Human Brain, side view: 

 i, medulla oblongata ; 3, cerebellum ; 

 5, frontal convolutions of cerebrum. 



FIG. 342. Human Brain, upper view, 

 one fourth natural size : i, anterior 

 lobes ; 2, posterior; 3, great median 

 fissure. 



but it is itself a nervous center : the brain above and 

 the cord below may be removed without death to the 



