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. Bayerischen
Akademie,' B. x. 1868.) on the cerebral convolutions of man and
apes; and as the purpose of my learned colleague was certainly
not to diminish the value of the differences between apes and men
in this respect, I am glad to make a citation from him.

"That the apes, and especially the orang, chimpanzee and gorilla,
come very close to man in their organisation, much nearer than to
any other animal, is a well known fact, disputed by nobody.
Looking at the matter from the point of view of organisation
alone, no one probably would ever have disputed the view of
Linnaeus, that man should be placed, merely as a peculiar
species, at the head of the mammalia and of those apes. Both
shew, in all their organs, so close an affinity, that the most
exact anatomical investigation is needed in order to demonstrate
those differences which really exist. So it is with the brains.
The brains of man, the orang, the chimpanzee, the gorilla, in
spite of all the important differences which they present, come
very close to one another" (loc. cit. p. 101).