168 



LECTURE VI. 



We are now told that the projection of the cerebellum is 

 caused by the defective development of the posterior lobe, 

 which is a decided character of man, " In the brain of our 

 microcephalus," says Wagner, "it may in our cast be seen 

 that the posterior and parietal lobes are reduced ;" and in 

 another passage, " The examination of seven or eight micro- 

 cephalous brains showed that the atrophy of the convolutions 



Fig. 61. The brain of an idiot, aged 26, described by Theile. The length 

 of the hemispheres is reduced to the same length as that of the chimpanzee, 

 fig. 58. The ventricle on the right side is laid open. The description is the 

 same as in figures 60 and 30. 



CO.. 



and the masses chiefly affected the posterior lobes and the pos- 

 terior portions of the parietal lobes." " The microcephalic 

 brain has just in its posterior part not the least resemblance 

 to the Simian brain ; it is a thoroughly human type, but atro- 

 phied." 



Now, gentlemen, I have taken the troiible to subject these 

 proportions to measurement, and as I had no materials at 



