GENESIS OF MAN, INTELLECTUALLY 



complexity of cerebrum. The cerebrum is the 

 organ especially set apart for the compounding 

 and recompounding of impressions that are not 

 immediately sensory. The business of coordi- 

 nating immediately presentative impressions is 

 performed by the medulla and other subordi- 

 nate centres. The cerebrum is especially the 

 organ of that portion of psychical life which is 

 entirely representative.^ Obviously, then, the 

 progress to higher and higher representativeness 

 ought to be accompanied by a well - marked 

 growth of the cerebrum relatively to the other 

 parts of the nervous system. Now, in the light 

 of the present argument, how significant is the 

 fact that the cranial capacity of the modern Eng- 

 lishman surpasses that of the aboriginal non- 

 Aryan Hindu by a difference of sixty -eight 

 cubic inches,^ while between this Hindu skull 

 and the skull of the gorilla the difference in 

 capacity is but eleven cubic inches ! That is to 

 say, the difference in volume of brain between 

 the highest and the lowest man is at least six 

 times as great as the difference between the low- 

 est man and the highest ape. And if we were 

 to take into the account the differences in struc- 

 tural complexity, as indicated by the creasing 

 and furrowing of the brain surface, we should 

 obtain a yet more astonishing contrast. Yet 



^ See above, vol. iii. pp. 201, 202. 

 2 Lyell, Antiquity of Man y p. 84. 



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