THE NERVOUS SYSTEM. 31 



the hair, then by the skin and muscles overlying the 

 skull, then by the bone, next by the hard coat, then 

 by the water coat, and finally by the soft coat mak- 

 ing no less than a half-dozen successive defenses 

 against harm to the castle of the mind. 



The brain is divided into two parts, one 



^ whicl1 is mucb lar g er tnan the other. 



These parts are shown here, in this 

 section which represents the head as divided from 

 top to bottom, close behind the ears. We will now 

 refer to the manikin of the head, where we will get 

 a very clear view of the size and position of these 

 brain parts. (Fourth section of the head.) This 

 (74) large upper brain is called the cerebrum. It 

 fills the whole front and upper part of the brain-box. 

 The small brain (75) is called the cerebellum. 

 Notice that it lies behind and below the large divi- 

 sion of the brain. When this small brain is cut 

 through, its inner structure has this tree-like appear- 

 ance (shown on plate), called the arbor vitce. 



Both the cerebrum and cerebellum 



Hemisphere*. *, n i AT 



are divided into two parts, called the 

 right and left hemispheres. The lower parts of the 

 two hemispheres are united by several small mys- 

 terious-looking organs, whose particular use has 

 been a puzzle even to many wise heads, but which 

 certainly have some special part to perform in the 

 wonderful control of the-mind over the body. The 

 last section of the head (turn to it), which repre- 

 sents it as cut through from front to back, in the 



