the anatomical differences between the Marmoset
and the Chimpanzee are much greater than those between the Chimpanzee
and Man.

But why do we thus introduce the study of Darwin's _Descent of Man_,
which is to occupy us here, by insisting on the fact that Huxley had
taken the field in defence of the descent of man in 1863, while
Darwin's book on the subject did not appear till 1871? It is in order
that we may clearly understand how it happened that from this time
onwards Darwin and Huxley followed the same great aim in the most
intimate association.

Huxley and Darwin working at the same _Problema maximum_! Huxley
fiery, impetuous, eager for battle, contemptuous of the resistance of
a dull world, or energetically triumphing over it. Darwin calm,
weighing every problem slowly, letting it mature thoroughly,--not a
fighter, yet having the greater and more lasting influence by virtue
of his immense mass of critically sifted proofs. Darwin's friend,
Huxley, was the first to do him justice, to understand his nature, and
to find in it the reason why the detailed and carefully considered
book on the descent of man made its appearance so late. Huxley, always
generous, never thought of claiming priority for himself. In
enthusiastic language he tells how Darwin's immortal work, _The Origin
of Species_, first shed light for him on the problem of the descent of
man; the recognition of a _vera causa_ in the transformation of
species illuminated his thoughts as with a flash. He was now content
to leave what perplexed him, what he could not yet solve, as he says
himself, "in the mighty hands of Darwin." Happy in the bustle of
strife against old and deep-rooted prejudices, against intolerance and
superstition, he wielded his sharp weapons on Darwin's behalf; wearing
Darwin's armour he joyously overthrew adversary after adversary.
Darwin spoke of Huxley as his "general agent."[75] Huxley says of
himself "I am Darwin's bulldog."[76]

Thus Huxley openly acknowledged that it was Darwin's _Origin of
Species_ that first set the problem of the descent of man in its true
light, that made the question of the origin of the human race a
pressing one. That this was the logical consequence of his book Darwin
himself had long felt. He had been reproached with intentionally
shirking the application of his theory to Man. Let us hear what he
says on this point in his autobiography: "As soon as I had become, in
the year 1837 or 1838, convinced that sp