Studies upon the Chinese brain. 107 



by Dercum m one of his brains. The anterior branch is 2,5 cm. long 

 and regular in direction. Where the fissure terminates there is an 

 attempt at bifurcation, one small branch, however, is but superficial 

 having scarcely an appreciable depth. There is quite a good sized 

 branch given off in the first part of the latter third of its course, 

 winch extends upwards into the ascending parietal convolution for a 

 distance of 2 cm. It ends by bifurcating at right angles to its axis, 

 thus forming a T-shaped fissure. The general direction is as in the 

 right hemisphere. 



The fissure of Rolando, 8 cm. long, is not as tortuous as its 

 fellow of the opposite side in the upper part of its course, but the 

 lower part is winding in direction and gives off numerous short trans- 

 verse branches. Its direction is as that in the right hemisphere, and 

 it extends over the margin of the great longitudinal fissure where it 

 ends. It is not confluent below with the Sylvian fissure as was the 

 case in one of the brains described by Dr. Dercum, but is separated 

 from it by a very narrow strip of convolution. 



The operculum on this side is about as large as that of the other 

 side, and the angle of this fissure with the great longitudinal is also 

 about 60°. 



The precentrai fissure, 6 cm. in length following its turns, is not 

 as intricate as its fellow of the opposite side, and does not give off 

 as many short branches, although there are two or three well marked 

 and deep but short ones. The peculiar lobe observed on the other 

 side is here wanting. The general course of this fissure is parallel 

 with that of the fissure of Rolando, but just below the margin of the 

 great mesial fissure it turns forward at right angles to itself for a 

 distance of 2 cm., where it ends in two very short bifurcations. 



The first frontal fissure, 8 cm. long, is quite regular save in the 

 anterior part of its course where it becomes exceedingly tortuous and 

 gives off innumerable little sulci which ramify in every direction. It is 

 not confluent with the precentral. 



The second frontal fissure, 9 cm. long, is extremely tortuous, and 

 is confluent with the fissure of Sylvius, extending from that point in 

 a horse-shoe direction upwards, forwards, and then downwards, ending 



