VASCULARITY OF THE CEREBRAL CORTEX 207 
areas, though the females surpass the males in three of the 
laminae of the insular cortex. In the subcortical regions the 
tendency was for the females to be richer than the males. It 
is perhaps hardly justifiable to base any conclusion upon the 
averages of so few individuals, especially when the difference is 
Vascularlily 
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Fig. 4 Graphs showing the relative vascularity of the cerebral cortex of the 
two sexes in each lamina of the five areas studied. Male @. Female +. 
~ not very great, being less than the amount of individual varia- 
tion, and when the poorer group includes the specimen (R. 56) 
for which the results are suspected of being rather low. Never- 
theless, it seems distinctly suggestive that the sexual difference 
should be so uniform and so much more definite in the cortex 
cerebri than in the lower centers studied. : 
