THE STORY OF THE BRAIN AND NERVE 117 



merely forwards, but backwards as well, so as 

 to overlap the hind brain. This principle of brain 

 development has its supreme exemplification in 

 man. The fore brain in man attains a size far 

 exceeding its dimensions in any other animal. The 

 smell parts, instead of projecting prominently in 

 front as in fishes, frogs, and reptiles, are found on 

 the under surface of man's brain (Fig. 31), a feature 



Fig. 32. SECTION OF BRAIN 



Showing inside of left half of cerebrum, the 



connecting bridge of the lobes, cerebellum in 



section, and medulla at top of spinal cord. 



also illustrated in many quadrupeds as well. In 

 man, the backward growth of the fore brain is also 

 extreme, and the hind brain is completely covered 

 and hidden when the brain is viewed from above 

 (Pig, 32.) Such is a brief account of the evolution 

 of the brain ; and in the development of man's brain 

 we are able to trace with a fair degree of accuracy 

 the various stages which represent the permanent 

 condition of the brain in lower forms of life. The 



