268 STUDY OF BRAINS OF SIX EMINENT SCIENTISTS AND SCHOLARS. 



]'■.) mm. ; post-sylvian, 25 mm. The presylvian ramus is 2 cm. in length while the 

 subsylvian is absent. 



The Central Fissure is 9.5 cm. in length and slightly more sinuous than that of 

 the right half. Its inclination to the meson is 68°. The central does not anastomose 

 with any of the neighboring fissures. 



Tke occipital fissure is 4.8 cm. in length on the meson, 2.5 cm. on the dorsum. Its 

 course is sinuous throughout and on the dorsum it anastomoses with the cephalic stipe 

 of the paroccipital. 



The calcarine fissure could not be examined, owing to the extensive loss of the 

 occipital parts. The occipito-calcarine stem anastomoses with the precuneal and 

 collateral fissures. 



Fissures of the Frontal Lobe {Lateral Surface). Tlie Precentral Fissure Complex. — 

 The supercentral fissure is a simple tri-radiate piece whose cephalic ramus is directly 

 continuous with the superfrontal. The ventral and dorsal limbs run parallel with the 

 central fissure, their total length being 5 cm. The precentral fissural element is less 

 extensive itself but sends a long "anterior precentral ramus" well across the medi- 

 frontal gyre and by means of the diagonal element it communicates directly with the 

 sylvian cleft. There is a well-marked transprecentral. 



The superfrontal fissure is distinct for a length of 6 cm. from its supercentral 

 origin. The fissural markings in the prefrontal region are too intricate to be distin- 

 guished by names. There is an orbitofrontal piece from which springs a short medi- 

 frontal. The subfrontal fissure is very well marked. 



Mesal Surface. — So far as the fragments of this specimen permit of examination 

 the supercallosal fissure appears in two segments separated by an oblique isthmus. 

 There are several frontomarginal segments and a well-marked rostral fissure. The 

 paracentral is extensive and unusually ramified. 



Tlie orbital surface is marked by a much-ramified-quadri-radiate orlutal fissure 

 together with several smaller independent segments. 



Gyres of the frontal Lobe [Lateral Surface). — The precentral gyre is of average 

 width. The superfrontal gyre is well-developed and marked by a distinct paramesial 

 fissure and several unnamed segments. The medifrontal is of good width and marked 

 by numerous transverse fissures. The subfi'ontal gyre is larger and better developed 

 than that of the right side. 



The rnesnl surface is incompletely j)reserved. The three-tier type prevails. The 

 paracentral gyre is large and of a rectangular shape. 



Orbital Surface. — The mesorbital gyre is rather narrow. The irregularly zygal 

 orbital fissure makes the configuration of this surface rather intricate as compared with 

 the more regular markings on the right side. 



