112 





LECTURE IV. 









No. 



1. (Dirichlet) - 



2. Female 



Convex surface in sr 

 of IG square milHni 



2553 



2498 



juare? 

 ■^ters. 



Weight in Grammes, 



1520 



1254 



3. (Fuchs) 



4. Male 



- 



2489 

 2451 



: : 



: : 



1499 

 1340 



5. (Gauss) 



- 



2419 



- 



- 



1492 



6. (Hermann) 



- 



2406 



- 



- 



1358 



7. Male - 



- 



2309 



- 



- 



1330 



8. Female 



- 



2300 



- 



- 



1185 



9. Female 



- 



2272 



- 



- 



1223 



10. Male - 



. 



2117 



. 



- 



1273 



11. (Hausmann) 



- 



2065 



- 



. 



1226 



12. Microcepliale 



- 



896 



- 



- 



300 



Wagner remarks, very justly, that this series is far too imper- 

 fect, and the number of measurements too small to draw from 

 them absolutely correct inferences. The whole series never- 

 theless indicates that a compensation may exist, that it pro- 

 bably does exist in females, and that it may also extend to 

 races which, like the Hindoos, to a certain extent exhibit 

 the female type in their small, and not very capacious skulls. 



On examining the convolutions, situated behind the central 

 convolutions on the surface of the brain, and which form the 

 parietal lobe, it is seen that they proceed from the posterior 

 central convolutions. They have the appearance of notched 

 rolls, which may also be divided into three stories, the upper- 

 most {h ) forming, as it were, only a fold of the central convolu- 

 tion. On viewing the brain from the top, this upper story reaches 

 a small transverse fissure, the perpendicular posterior, or inner 

 cerebral fissure (V), which has only a small superficial extent 

 in man, but penetrates the more deeply into the interior. The 

 great importance of this fissure is shown partly by its early 

 appearance in the foetus, immediately after the appearance of 

 the Sylvian fissure and that of Rolando, when there is scarcely 

 any trace of the other furrows as anfractuosities of the frontal 

 lobe ; and further, by the fact that in the ape it can be dis- 

 tinctly traced far over the side, separating the occipital from 

 the parietal lobe, so that the first forms a characteristic flap 

 which, overlapping the posterior margin of the parietal lobe, 

 covers some convolutions which in man lie on the surface. 

 The second or middle convolution of the parietal lobe (6-), 



