294 STUDY OF BRAINS OF SIX EMINENT SCIENTISTS AND SCHOLARS. 



vian cleft. Caudally the fissure anastomoses with several other fissural elements, 

 which render a precise description very difficult. The meditemporal and subtem- 

 poral fissures are quite ramified. The collateral fissure is quite long and anastomoses 

 with the postcalcarine fissure. 



Gyres of the Temporal Lobe. — The supertemporal gyre is narrowed near the epi- 

 sylvian fissure. The other temporal gyres are broad and complexly fissured. The 

 subcalcarine gyre is especially broad in its caudal portion. The hippocampal gyre is 

 rather narrow. 



Owing to the fragility of the specimen the insulse could not be examined in either 

 hemicerebrum. 



Right Hemicerebrum. The Interlobar Fissures. The Sylvian Fissure and its 

 Rami. — The sylvian fissure is very short (4 cm.) and its presylvian and subsylvian 

 rami are considerably divaricated. The episylvian is 3 cm. in length ; the hyposylvian 

 1 cm. Several fissures dip into the sylvian cleft. 



The Central Fissure is fairly sinuous, is 10.5 cm. in length and anastomoses with 

 the postcentral over a very superficial vadum. 



The Occipital Fissure. — On the meson measures 3 cm. ; on the dorsum, 2 cm. 

 At the dorsi-mesal margin there is a small fossette where the occipital apparently 

 divides into four rami. The vertical piece is the adoccipital. 



The Calcarine Fissure. — The combined calcarine-postcalcarine is a simply sinuous 

 fissure of a length of 6 cm., terminating caudally in a T-shaped bifurcation. The occi- 

 pito-calcarine stem is a complex affair. 



Fissures of the Frontal Lobe (Lateral Surface). The Precentral Fissural Complex. 

 — The supercentral and precentral elements are confluent and quite ramified. From 

 the combined fissure springs the superfrontal. The latter is interrupted by a trans- 

 verse gyre which is demarcated by a very extensive transverse fissure passing from the 

 dorsi-mesal border nearly to the subfrontal fissure. In the prefrontal region there are 

 several other but shorter transverse pieces. The medifrontal springs from a short 

 orbitofrontal and is 4 cm. in length. The subfrontal, together with the diagonal and 

 radiate fissures which anastomose with it, is a very extensive complex. 



3Iesal Surface. — The arrangement of the fissures on the mesal surface is as fol- 

 lows : The paracentral is continuous cephalad with the frontomarginal (which appears 

 like a duplication of the supercallosal), the supercallosal proper is rather short (6 cm.), 

 the rostral fissure attains a length of 6 cm., while the subrostral is also quite long 

 (3.5 cm.). There is a tri-radiate intraparacentral. 



Gyres of the Frontal Lobe (Lateral Surface). — The precentral gyre is of good breadth, 

 the superfrontal is fairl}' fused with the dorsal tier of the medifrontal by the numerous 



