ted for its benefit. His words are (p. 199):--

"The foregoing remarks lead me to say a few words on the protest lately
made by some naturalists against the utilitarian doctrine that every
detail of structure has been produced for the good of its possessor.
They believe that very many structures have been created for beauty in
the eyes of man, or for mere variety. This doctrine, if true, would be
absolutely fatal to my theory--yet I fully admit that many structures
are of no direct use to their possessor."

And after sundry illustrations and qualifications, he concludes (p.
200):--

"Hence every detail of structure in every living creature (making some
little allowance for the direct action of physical conditions) may be
viewed either as having been of special use to some ancestral form,
or as being now of special use to the descendants of this form--either
directly, or indirectly, through the complex laws of growth."

But it is one thing to say, Darwinically, that every detail observed
in an animal's structure is of use to it, or has been of use to its
ancestors; and quite another to affirm, teleologically, that every
detail of an animal's structure has been created for its benefit. On the
former hypothesis, for example, the teeth of the foetal Balaena have
a meaning; on the latter, none. So far as we are aware, there is not
a phrase in the 'Origin of Species', inconsistent with Professor
Kolliker's position, that "varieties arise irrespectively of the notion
of purpose, or of utility, according to general laws of Nature, and may
be either useful, or hurtful, or indifferent."

On the contrary, Mr. Darwin writes (Summary of Chap. V.):--

"Our ignorance of the laws of variation is profound. Not in one case out
of a hundred can we pretend to assign any reason why this or that part
varies more or less from the same part in the parents.... The external
conditions of life, as climate and food, etc., seem to have induced some
slight modifications. Habit, in producing constitutional differences,
and use, in strengthening, and disuse, in weakening and diminishing
organs, seem to have been more potent in their effects."

And finally, as if to prevent all possible misconception, Mr. Darwin
concludes his Chapter on Variation with these pregnant words:--

"Whatever the cause may be of each slight difference in the offspring
from their parents--and a cause for each must exist--it is the steady
accumulation, through natural s