For the fuller
development of the foregoing, I must refer the reader to my work "Life
and Habit."
The purposiveness, which even Dr. Darwin (and Lamarck still less) seems
never to have quite recognised in spite of their having insisted so much
on what amounts to the same thing, now comes into full view. It is seen
that the organs external to the body, and those internal to it, are the
second as much as the first, things which we have made for our own
convenience, and with a prevision that we shall have need of them; the
main difference between the manufacture of these two classes of organs
being, that we have made the one kind so often that we can no longer
follow the processes whereby we make them, while the others are new
things which we must make introspectively or not at all, and which are
not yet so incorporate with our vitality as that we should think they
grow instead of being manufactured. The manufacture of the tool, and the
manufacture of the living organ prove therefore to be but two species of
the same genus, which, though widely differentiated, have descended as it
were from one common filament of desire and inventive faculty. The
greater or less complexity of the organs goes for very little. It is
only a question of the amount of intelligence and voluntary
self-adaptation which we must admit, and this must be settled rather by
an appeal to what we find in organism, and observe concerning it, than by
what we may have imagined _a priori_.
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