th men in general the instinct exists.
Such is human nature. And the instinct, it will be admitted, is
innocent, and human nature is preserved by our following the lead of its
innocent instincts. Therefore, in seeking to gratify this instinct in
question, we are following the instinct of self-preservation in
humanity.

But, no doubt, some kinds of knowledge cannot be made to directly serve
the instinct in question, cannot be directly related to the sense for
beauty, to the sense for conduct. These are instrument-knowledges; they
lead on to other knowledges, which can. A man who passes his life in
instrument-knowledges is a specialist. They may be invaluable as
instruments to something beyond, for those who have the gift thus to
employ them; and they may be disciplines in themselves wherein it is
useful for every one to have some schooling. But it is inconceivable
that the generality of men should pass all their mental life with Greek
accents or with formal logic. My friend Professor Sylvester, who is one
of the first mathematicians in the world, holds transcendental doctrines
as to the virtue of mathematics, but those doctrines are not for common
men. In the very Senate House and heart of our English Cambridge I once
ventured, though not without an apology for my profaneness, to hazard
the opinion that for the majority of mankind a little of mathematics,
even, goes a long way. Of course this is quite consistent with their
being of immense importance as an instrument to something else; but it
is the few who have the aptitude for thus using them, not the bulk of
mankind.

The natural sciences do not, however, stand on the same footing with
these instrument-knowledges. Experience shows us that the generality of
men will find more interest in learning that, when a taper burns, the
wax is converted into carbonic acid and water, or in learning the
explanation of the phenomenon of dew, or in learning how the circulation
of the blood is carried on, than they find in learning that the genitive
plural of _pais_ and _pas_ does not take the circumflex on the
termination. And one piece of natural knowledge is added to another, and
others are added to that, and at last we come to propositions so
interesting as Mr. Darwin's famous proposition that "our ancestor was a
hairy quadruped furnished with a tail and pointed ears, probably
arboreal in his habits." Or we come to propositions of such reach and
magnitude as those which Professo