STUDY OF BRAINS OF SIX EMINENT SCIENTISTS AND SClIoLAKS. 273 



resent the actual appearances presented by the cerebral parts as tliey liave hardened 

 in this distorted condition. Owing to this manifest displacement the writer refrains 

 from attempting to describe the general appearances of the cerebrum as a whole ; a 

 morphological description of the fissures and gyres must suffice. 



The large relative size of the callosum is striking and will be discussed more at 

 length in the sequel. The crura cerebri are also quite large. 



Left Hemioerebrum. The Interlobar Fissures. The Siflriaii Fissure and iU 

 Rami. — The sylvian fissure is extremely short, only 3.9 cm. in length. Its depths 

 are as follows: Pre-sylvian depth, 13 mm.; medi-sylvian, 21 mm.; post-sylvian 28 

 nmi. The presylvian ramus bifurcates and with its larger arm attains a length of 3 

 cm. The subsylvian is short. The episylvian is 3 cm. in length and there is a short 

 ramifying hyposylviaii. 



The central fi.vsure pursues a very sinuous course, exhibiting seven alternate curves 

 and attaining a length of 1 1 cm. It anastomoses with the postcentral and supercentral 



Ihc occipital fis.m,re, on the mesal surface, is 3 cm. in lengtii ; on the dorsum it 

 curves cephalad. A postparoccipital segment which dips into the occipital cleft joins 

 it (superficially) with the paroccipital. On the dorsal surface it is characterized by a 

 marked turn cephalad. 



The calcarine fissure and postcalcarine fissure together attain a length of 6.5 cm., 

 the terminal part passing well onto the convex surface. The occipito-calcarine stem 

 is nearly 3 cm. in length. 



Fissures of the Frontal Lube {Lateral Surface). The Precentral Fis.mral Comple.c. — The 

 supercentral is tri-radiate, its cephalic arm continuing as the superfrontal. The ventral 

 limb anastomoses with the central. The precentral segment is 4 cm. in length and anas- 

 tomoses with the sul)frontal. There is a sliort transprecentral but no diagonal fissure. 



7 he superfrontal fissure consists of two segments : the caudal one springs from the 

 supercentral and is 4 cm. in length ; the cephalic one is shorter but pursues a more 

 tortuous course and is more ramified. The intricacy of the prefrontal region is such 

 as to make it difficult to trace the fissural integers and the reader must be referred to 

 the figures. 



Mesal Surface. — The supercallosal fissure springs from the paracentral, attains a 

 length of 10 cm. and anastomoses with the rostral fissure. The paracentral is rather 

 short (2.6 cm.) and sends otF several rami. A number of fronto-marginal segments, 

 mostly of zygal shape, mark the superfrontal gyre on the mesal surface. The rostral 

 fissure joins a transrostral element, forming a U-shaped piece. 



Orbital Surface. — The fissuration on this surface is quite complex and difficult to 

 describe in words; the reader is again referred to the illustration. 



