16).
But the roofs of the orbits rise more obliquely into the cranial cavity,
thus diminishing the space for the lower part of the anterior lobes of
the brain, and the absolute capacity of the cranium is far less than
that of Man. So far as I am aware, no human cranium belonging to an
adult man has yet been observed with a less cubical capacity than 62
cubic inches, the smallest cranium observed in any race of men by
Morton, measuring 63 cubic inches; while, on the other hand, the most
capacious Gorilla skull yet measured has a content of not more than
34-1/2 cubic inches. Let us assume, for simplicity's sake, that the
lowest Man's skull has twice the capacity of that of the highest
Gorilla.*
[Footnote] *It has been affirmed that Hindoo crania
sometimes contain as little as 27 ounces of water, which
would give a capacity of about 46cubic inches. The minimum
capacity which I have assumed above, however, is based upon
the valuable tables published by Professor R. Wagner in
his "Vorstudien zu einer wissenschaftlichen Morphologie und
Physiologie des menschlichen Gehirns.
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