Chap. XXL] OF THE HUMAN BRAIN. 393 



formed. The diminution in genenil size of the frontal 

 and parietal lobes is still very obvious, both in breadth as 

 well as in iength ; though it is not a diminution localized 

 in any particular parts of these lobes. Nor is there any 

 appreciable difference observable in the convolutional de- 

 velopment of any part of the hemisphere, as compared 

 with that of the opposite side. The region of the ' supra- 

 marginal lobule ' and of the ' angular gyrus ' seems cer- 

 tainly to be just as well developed on the left as it is 

 on the right side, though these are the convolutions which, 

 according to Ferrier, are to be regarded as the principal 

 site of the ' Visual Centre.' 



Except for the degenerated condition and wasted 

 appearance of the right optic nerve and the correspondin,'^ 

 left 'optic tract,' there is nothing to be discovered which caj 

 possibly account for the smaller size and stunted develop- 

 ment of the left Hemisphere. The anterior of the quadri- 

 geminal bodies on the left side is slightly less prominent 

 than that of the right side, and it is also slightly different 

 in colour : but it was not examined previous to the immer- 

 sion of the Brain in spirits of wine. The Cerebellum seems 

 to be quite symmetrical ; its right and left halves present- 

 ing the same measurements. And, in regard to this 

 point, it is important to observe here that Prof. De Mor- 

 gan had never suffered from any paralytic condition or 

 affection of motihty, so that my first impression that there 

 ought to have been an associated atrophy of the opposite 

 lateral lobe of the Cerebellum (as in many cases of atrophy 

 of one Cerebral Hemisphere) was seen, on further con- 

 sideration, not to be well-grounded. We may rightfully look 

 for this in instances of atrophy of one Cerebral Hemisphere 

 associated with unilateral motor Paralysis, but not in cases 

 where the latter condition is absent, and in which one 

 of the Hemispheres seems to be imperfectly developed 



