CHAP. XXL] 



OF THE HUMAN BRAIN. 



397 



In the higher forms of the Human Brain as in those of 

 Gauss and De Morgan, and also in the Journalist the 

 Temporal and Occipital Lobes of each Hemisphere together 

 bear a much smaller proportion to the mass of brain- 



FIG. 144. Under Surface of the Human Brain. (Allen Thomson.) 

 1, 1, Great longitudinal fissure ; 2, 2', 2", convolutions of under surface of frontal 

 lobe ; 3, 3, 3, prolongation to base of the fissure of Sylvius ; 4, 4', 4", convolutions 

 of the temporal lobe ; 5, 5', occipital lobe ; 6, anterior pyramids of medulla ; +, pos- 

 terior extremity of median lobe of cerebellum ; 7, 8, 9, 10, lobules of the lateral lobe 

 of the cerebellum. I-IX. Cranial nerves, all but the first more fully seen in next 

 figure. The ninth nerve of the right side has been removed. X. First cervical 

 nerve. 



substance comprised in the Frontal and Parietal Lobes 

 than is the case in brains of a lower type. In the lower 

 Quadrumana, also, the Temporo- Occipital segment of the 



