784 



MAN 



cent, in baboon 31 per cent and in Iciiuir 23 per cent. It is, therefore, in 

 the expansion of the frontal lobe, both in the area covered by it and the 

 great increase in the complexity of its convolutions, that xhv human brain 



FIG. 338A. B.\SE OF BRAIN, HOMO SAPIENS. 



Stands in striking contrast to the anthropoids. The c(>n\ olutional com- 

 plexity is likewise increased in the occipital region, and this is also true, 

 perhaps to a less extent, in the temporal and parietal areas. These regions. 



