THE BRAIN. 395 



iv. The cerebellum is attached to the dorsal surface 

 at the junction of the vela medullse anterius 

 and posterius. It consists of an outer layer 

 of grey matter, which is very deeply folded, 

 and a central much-branched mass of white 

 matter, the section having a tree-like appear- 

 ance, which has given rise to the name arbor 

 vitse. 



V. The pons Varolii is seen, in transverse section, 

 crossing the ventral surface of the anterior 

 part of the hind-brain, opposite the velum 

 meduUse anterius. 



8. Transverse sections of the brain. 



If another brain can he obtained, it should be cut with a 

 razor into a series of transverse sections, about an eighth of 

 an inch thick, and the sections arranged in order in a dish of 

 spirit. 



Such a series of sections affords very instructive 

 views of the mutual relations of the several parts of 

 the brain. 



