Chap. XXL] 



OF THE HUMAN BRAIN. 



383 



" The external perpendicular fissures (fig. 135, P) can be 

 traced as easily as in the Hottentot Venus (fig. 134, T"), but 

 are soon interrupted by the external connecting convolu- 

 tions {a, /3). Towards the sides these fissures are cer- 

 tainly more easily followed than in the European — a cir- 



FiG. 138.— Vertex View of the Brain of a Scotchman. (After Turner.) 

 Fr, Frontal lobe ; Par, parietal lobe ; Oc, occipital lobe ; S F, supero-frontal, 

 IF, infer o-frontal fissure ; R, fissure of Rolando ; / P, intra-parietal, and P C, parieto- 

 occipital fissure ; S, horizontal, and S', ascending limb of the Sylvian fissure 

 A, supra-marginal lobule. 1, 1, Inferior, 2, i.', middle, and 3, 3, 3, superior frontal 

 convolutions ; 4, 4, ascending frontal, and 5, 5, pscending pai-ietal convolution ; 

 5', outer, and .5", inner jiart of postero-parietal lobule ; 6, 6, angular convolution ; 

 10, tuperior occipital convolution, a, a, first, and p, second anntctent convolution. 



cumstance which imparts a lower character to this part of 

 the Bosjes brain ; at the same time they are far more 

 interrupted than in the Chimpanzee or Orang-outan. 

 These short external perpendicular fissures join as usual 

 the summits of the internal perpendicular fissures, and, 



