posture; in the Gorilla, it lies in the posterior third of that base.
In the Man, the surface of the skull is comparatively smooth, and the
supraciliary ridges or brow prominences usually project but
little--while, in the Gorilla, vast crests are developed upon the
skull, and the brow ridges overhang, the cavernous orbits, like great
penthouses.

Sections of the skulls, however, show that some of the apparent defects
of the Gorilla's cranium arise, in fact, not so much from deficiency of
brain case as from excessive development of the parts of the face. The
cranial cavity is not ill-shaped, and the forehead is not truly
flattened or very retreating, its really well-formed curve being simply
disguised by the mass of bone which is built up against it (Fig. 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