CHAP. XXL] 



OF THE HUMAN BRAIN. 



385 



panzee 93. As in the European brain, however, this 

 fissure joins the fissure of the hippocampi below (fig. 139), 

 whilst in the Quadru- 

 mana it usually stops 

 short of that fissure." 

 We cannot follow 

 Prof. Marshall in his 

 interesting and de- 

 tailed examination of 

 the various convolu- 

 tions of the Bush- 

 woman's brain, includ- 

 ing his estimation of 

 the degree of their de- 

 velopment in relation 

 to those of the Hot- 

 tentot Venus and those 

 of the ordinary Euro- 

 pean brain ; we can 

 only reproduce some 

 of his most interesting 

 general conclusions. 



All the primary eonvo 

 lutions which should exist 

 in the human cerebrum 

 "are present in the Bush- 

 woman's brain ; but, as 

 compared with the same 

 parts in the ordinary 

 European brain, they are 



FIG. 140. View of the Orbital Lobule and of 

 the Island of Reil. (After Turner.) 



Most of the temporal lobe has been removed 

 for the purpose of displaying the Island. 0, Ol- 

 factory sulcus ; T R, triradiate sulcus ; I", pos- 

 terior, l'", internal, and I"", external convolu- 

 tions of the orbital lobule ; C, Island of Reil, with 

 its radiating convolutions ; 1, 1, under surface of 

 lower or third frontal convolution ; 4, under 

 surface of lower end of ascending frontal con- 

 volution ; 5, under surface of lower end of parie- 

 tal convolution ; 17, marginal convolution. 



smaller, and in all cases 

 so much less complicated as to be far more easily recognized and 

 distinguished amongst each other. This comparative simplicity 

 of the Bushwoman's brain is, of course, an indication of structural 

 inferiority, and indeed renders it a useful aid in the study of 

 the more complex European form. On contrasting the several 



C C 



