STUDY OF BRAINS OF SIX EMINENT SCIENTISTS AND SCHOLARS. 293 



central fissure is of tlie usual form except that the element of the cephalic limb may- 

 be represented in the caudal piece of the supercallosal. There is a well-marked 

 inflected fissure, over 3 cm. in length, and a frontomarginal piece marks the super- 

 frontal gyre. The rostral and subrostral fissures are irregularly represented. 



Orbital Surface. — The orbital fissure is h-shaped. The olfactory fissure is simple 

 and 4.5 cm. in length. 



Gyres of the Frontal Lobe {Lateral Surface). — The precentral gjn-e is of good pro- 

 portions and particularly wide in its ventral third, where the emissary-motor centers 

 for the faculty of speech lie. The reinaining frontal gyres, superfrontal, medifrontal 

 and subfrontal, are all well developed, wide and fairly complexly fissured. 



The mesal surface of the superfrontal gyre is of good width and in its prefrontal 

 portion exhibits a high degree of complex configuration. The paracentral gyre is of 

 average size and the callosal gyre, as noted above, is for a portion of its extent subdi- 

 vided into two tiers by a medicallossal fissure. 



Fissures of the Parietal and Occipital Lobes (Lateral Surface). The Postcentral Fis- 

 sural Complex. — The postcentral fissure is 4.5 cm. in length; its dorsal limbs, very 

 obtusely divaricated, embrace the annectent gyre curving around the caudal limb of 

 the paracentral. It sends off several rami and anastomoses with the parietal. The 

 interpretation of the fissural parts in the region usually occupied by the subcentral, so 

 useful in demarcating the postcentral gyre from the marginal is in this case obscured. 

 There is a complexly ramified transpostcentral, together with two elements of a sub- 

 central, of which one continues into the postcentral-subcentral piece. The parietal 

 fissure is 4 cm. in length and joins the zygon of tlie paroccipital fissure. The paroc- 

 cipital is of a compound zygal type. There is a well-marked and sinuous transparietal 

 which anastomoses with the postcentral. The fissui'ation in the parieto-occipital tran- 

 sition is quite complex. 



Mesal Surface. — The precuneal fissure is of irregular zygal shape and anastomoses 

 with the paracentral. The intra-precuneal is continuous across the dorsi-mesal border 

 with the transparietal. A cuneal fissure communicates with the occipital. A tri-ra- 

 diate postcuneal lies at the dorsi-mesal margin of the cuneus. 



Gyres of the Parietal and Occipital Lobes {Lateral Surface). — The poscentral gyre 

 is of fair size and usual flexuosity. The parietal gyre is of good breadth, as is the 

 paroccipital. The marginal gyre is particularly extensive. 



Mesal Surface. — The precuneus is of good size, but the cuneus is relatively 

 reduced. 



Fissures of the Temporal Lobe. — The supertemporal fissure is notably interrupted 

 in two places, presenting three segments, of which the middle one dips into the syl- 



