It was originally asserted
and re-asserted, with singular pertinacity, that the brain of all
the apes, even the highest, differs from that of man, in the
absence of such conspicuous structures as the posterior lobes of
the cerebral hemispheres, with the posterior cornu of the lateral
ventricle and the hippocampus minor, contained in those lobes,
which are so obvious in man.
But the truth that the three structures in question are as well
developed in apes' as in human brains, or even better; and that
it is characteristic of all the Primates (if we exclude the
Lemurs) to have these parts well developed, stands at present on
as secure a basis as any proposition in comparative anatomy.
Moreover, it is admitted by every one of the long series of
anatomists who, of late years, have paid special attention to the
arrangement of the complicated sulci and gyri which appear upon
the surface of the cerebral hemispheres in man and the higher
apes, that they are disposed after the very same pattern in him,
as in them. Every principal gyrus and sulcus of a chimpanzee's
brain is clearly represented in that of a man, so that the
terminology which applies to the one answers for the other. On
this point there is no difference of opinion. Some years since,
Professor Bischoff published a memoir (70. 'Die Grosshirn-
Windungen des Menschen;' 'Abhandlungen der K.
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