THE RABBIT. 379 



Monro (§§ 501, 507, 513), passes downwards and back- 

 wards, and ends in the corpus mammillare : it is best made 

 out in a fresh brain. 



LXV. In another brain make a longitudinal vertical 

 section of the whole organ, a very little to one 

 side — say the left — of the median line. Make 

 out^ without further dissection, the relation of the 

 median ventricles, infundibulum, corpus callosum, 

 commissures of the third ventricle, &c. 

 LXVI. In a third thoroughly hardened brain make 

 a series of transverse sections, and note in them 

 the relations of the parts already seen by dissec- 

 tion. The sections should be taken through — 

 («), The anterior end of the corpus callosum and the 



septum lucidum. 

 {b). The anterior commissure. 

 {c). The foramen of Monro and optic chiasma. 

 {d). The middle commissure. 

 {e). The posterior commissure and infundibulum. 

 (/). The nates and corpus mammillare. 

 {g). The testes, valve of Vieussens, and pons Varolii. 

 {h). The flocculi and hinder part of the medulla 

 oblongata. 



