26 



Fig. 8. 



one and further back than the other (figs. 8 & 9). Their pos- 

 terior development is so marked that anthropotomists have 

 assigned to that part the character and name of a ' third lobe :' 

 it is peculiar and common to the genus Homo : equally pecu- 

 liar is the i posterior horn of the lateral ventricle ' and the 

 'hippocampus minor,' which characterize the hind lobe 

 of each hemisphere. 

 The superficial grey 

 matter of the cere- 

 brum, through the 

 number and depth 

 of the convolutions, 

 attains its maximum 

 of extent in Man. 



Peculiar mental 

 powers are associ- 

 ated with this high- 

 estform of brain, and 

 their consequences 

 wonderfully illus- 

 trate the value of the 

 cerebral character ; 

 according to my es- 

 timate of which, I 

 am led to regard the 

 genus Homo as not 

 merely a representa- 

 tive of a distinct or- 

 der, but of a distinct 

 subclass,oftheMam- 

 malia, for which I 

 propose the name 

 of ARCHENCEPHALA 

 (fig. 9) . Ib. Side view, one-third iiat. size. 



Brain of Negro, upper view. 



Fig. 9. 



to overrule ; 



, brain. 



