CHAP. XXL] OF THE HUMAN BRAIN. 391 



educated person and because it presented a well-marked 

 complicacy of its convolutions, with the view of subse- 

 quently comparing it with that of the recently-deceased 

 Mathematician. 



In both these brains, as well as in that of Gauss, the 

 fissures of Rolando are very sinuous, owing to the exist- 

 ence of many secondary foldings of the ascending frontal 

 and parietal convolutions.* The relative position of these 



PIG. 143. Front view of Frontal Lobes of the Brain of a Journalist, showing the 

 extreme complicacy of its Convolutions. Owing to slight obliquity of position, 

 the right Frontal Lobe is more fully shown than the left. (Accurately drawn by 

 V. Horsley, from a photograph.) 



fissures was, however, very different in the two brains, 

 and in that of the Journalist the distance of the lower 

 end of the fissure of Rolando from the tip of the temporal 

 lobe was altogether remarkable. 



As a consequence apparently of a blindness of the 

 right eye, dating from a few days after birth, the left 

 Cerebral Hemisphere of De Morgan's brain was notably 



* No bridge-like convolution was to be seen crossing the fissure 

 of Eolando in either brain. On the right side, but not on the left, 

 and this only in the brain of De Morgan, the fissure of Rolando 

 opened into the fissure of Sylvius. 



