STUDY OF BKAINS OF SIX EMINENT SCIENTISTS AND SCHOLARS. 255 



what greater mass it encroaclies further upon its sylvian cleft, materially shortening it. 



Mesial Surface. — The cuneus and precuneus are both of much greater extent 

 and also rather more richly fissured than the corresponding parts of the left half* 

 The markedly obtuse angle of the cuneus at the point of junction of the occipital and 

 calcarine fissures is quite notable. The cuneolus on this side is smaller than on the left. 



Fissures of the Temporal lobe (Ventro-lateral Surface). — The supertem- 

 poral fissure is well-developed, quite sinuous and attains the great length of 14 cm. 

 It anastomoses with a meditemporal segment and superficially with the parietal. The 

 meditemporal is represented by four independent segments of which the caudal one is 

 ([uite complex. Two fissural pieces represent the subtemporal ; the cephalic one is 

 tri-radiate and communicates with a meditemporal segment. The collateral is not 

 very long. An independent part of it, cephalad, joins the postrhinal (amygdaline) 

 groove. 



Gyres of the Temporal Lobe. — The superteniporal gyre is narrow cephalad 

 l)ut broadens out very much in the region of transition into the subparietal lobule 

 {i. e., marginal gyre). There is a compensatory cephalic widening of the meditemporal 

 gyre, the caudal part being of moderate width. The subtemporal gyre is of the usual 

 dimensions except in its caudal part where it broadens out in the transition into the 

 very redundant expanse of the po.stparietal region. 



The Insula. —The right insula resembles that of the left in most respects but is 

 slightly less massive as shown by the depths of the Sylvian. Tlie preinsular region is 

 not so expansive and the transinsular fissure passes further cephalad than on the left 



side. 



Principal Measurements of the Cerebrum. 



{After Hardening. ) 



Centimeters, 



Maximum length, left hemicerebrum. ...... 17.9 



Ma.'cimum length, right hemicerebrum ...... 18.2 



Maximum width of cerebrum (cerebral index = 74.9) . . . 13.4 



Horizontal circumference ......■• 51 



Maximum width, left hemicerebrum ...... 6.7 



Maximum width, right hemicerebrum . . . . • • 6.7 



Left occipito- temporal length 13-2 



Right occipitotemporal length 13-3 



Length of callosum . . ■ • • ■ • • ■ 8.5 

 or 46.7 per cent, of total cerebral length. 



* Pieces of sheet-lead, of Uniterm thickness and density, as ascertained hy a number of control-tests, cut of the same 

 size as the visible surface of the precuneus and cuneus together weighed as follows : Left. :n.8 gms. ; right, 35 gms. 

 Ratio of left to right as 100 : 110. 



A. P. S.^XXI. DD. 2, 11, '07. 



