STUDY OF BRAINS OF SIX EMINENT SCIENTISTS AND SCHOLARS. 287 



Mesial Surface. — The supercallosal is duplicated, i. e. represented by two seg- 

 ments which for a part of their course run parallel with each other. The caudal part, 

 from its junction with the paracentral passes to cephalad of the genu, with a length of 

 6 cm. ; the cephalic segment curving around the genu is 7 cm. in length. Both seg- 

 ments send off rami into the superfrontal gyre. 



The paracentral fissure is of the same extent as on the left half, and sends off an 

 intraparacentral ramus. Strictly speaking, there is not a true inflected fissure present ; 

 for the piece lying in the situation corresponding to the left inflected does not traverse 

 or even reach the dorsi-mesal margin. 



There is an independent rostral fissure. 



Orbital Surface. — The fissures are three in number, exclusive of the olfactory. 

 The principal one of the orbital fissures is the transorbital of Weisbach 3 cm. in length. 

 The olfactoi-y fissure is simple and 4 cm. in length. Only tlie extreme end is visible 

 on the mesial aspect. 



Gyres of the Frontal Lobe (Lateral Surface). — The precentral gyre is a 

 trifle more tortuous and massive than on the left side. The superfrontal gyre is well 

 demarcated and intricately fissured. The medifrontal and subfrontal together are of 

 complex appearance, and are not clearly bounded from each other by distinct and 

 typical fissures, since there is a tendency toward transverse, rather than longitudinal 

 fissuration.* 



Mesial Surface of the superfrontal is of similar expanse as on the left and is quite 

 richly fissured. The paracentral gyre is of about the same size as on the left side, and 

 its surface is marked by two intraparacentrals and a ramus of the paracentral. The 

 dorsi-mesal margin is indented by the central and by a small unnamed segment just 

 cephalad of the central. 



Through the duplication of the supercallosal and the consequent deviation of the 

 first segment toward the callosum, the callosal gyre is quite narrow in its cephalic 

 part ; caudad it is broader and marked by several fissures. 



Orbital Surface. — The mesorbital gyre is a trifle narrower than that of the left 

 side ; the orbital surface generally is well fissured, but of less extent than that of the 

 left half. The transorbital fissure permits of a division into a postorbital and several 

 preorbital gyres. There is a slight tendency toward the formation of a "limbus" as 

 has been noted on the left side. 



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

 central Fissural Complex. — This consists of the usual two (postcentral and subcentral) 



* On the right side of the brain of Czolgosz there is similar tendency shown in the division of the subfrontal fissure 

 into two segments with intervening transverse pieces. 

 A. P. S.— XXI. MM. 8, 11, '07. 



