624 
Proceedings of the Royal Society of Edinburgh. [Sess. 
It would thus appear that the higher and more civilised races of Man- 
kind owe their more advanced evolutionary position to an increased develop- 
ment of the lobus parietalis rather than to the lobus frontalis ; that this 
parietal increase is partly actual as the result of the increased brain, and 
partly relative, being gained at the expense of the occipital lobe, and that 
these important facts are not altogether indicated by a study of the parietal 
and frontal arcs. In other words, the infinitely greater “ intellectuality ” of 
the higher races is gained by the growth of the educational portion of the 
neopallium at the expense of the visual area of the lower races. 
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