er hand, wherever the actual
reduction of the habits of animals to those of matter may have
stopped, we can never know that a further reduction is impossible.

The balance of reasonable presumption, however, is not even. The most
inclusive movements known to us in nature, the astronomical, are
calculable, and so are the most minute and pervasive processes, the
chemical. These are also, if evolution is to be accepted, the earliest
processes upon which all others have supervened and out of which, as
it were, they have grown. Apart from miraculous intervention,
therefore, the assumption seems to be inevitable that the intermediate
processes are calculable too, and compounded out of the others. The
appearance to the contrary presented in animal and social life is
easily explicable on psychological grounds. We read inevitably in
terms of our passions those things which affect them or are analogous
to what involves passion in ourselves; and when the mechanism of them
is hidden from us, as is that of our bodies, we suppose that these
passions which we find on the surface in ourselves, or read into other
creatures, are the substantial and only forces that carry on our part
of the world. Penetrating this illusion, dispassionate observers in
all ages have received the general impression that nature is one and
mechanical. This was, and still remains, a general impression only;
but I suspect no one who walks the earth with his eyes open would be
concerned to resist it, were it not for certain fond human conceits
which such a view would rebuke and, if accepted, would tend to
obliterate. The psychological illusion that our ideas and purposes are
original facts and forces (instead of expressions in consciousness of
facts and forces which are material) and the practical and optical
illusion that everything wheels about us in this world--these are the
primitive persuasions which the enemies of naturalism have always been
concerned to protect.

One might indeed be a vitalist in biology, out of pure caution and
conscientiousness, without sharing those prejudices; and many a
speculative philosopher has been free from them who has been a
vitalist in metaphysics. Schopenhauer, for instance, observed that the
cannon-ball which, if self-conscious, would think it moved freely,
would be quite right in thinking so. The "Will" was as evident to him
in mechanism as in animal life. M. Bergson, in the more hidden reaches
of his thought, seems to be