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Sir C. Bell, being thus convinced, maintains that many of our facial muscles are "purely instrumental in expression;" or are "a special provision" for this sole object. 12 But the simple fact that the anthropoid apes possess the same facial muscles as we do,13 renders it very improbable that these muscles in our case serve exclusively for expression; for no one, I presume, would be inclined to admit that monkeys have been endowed with special muscles solely for exhibiting their hideous grimaces.
It had the double cephalization ratio of brain size to body size of the anthropoid apes in general and half that of man . . .