But leaving our own impressions of the “Origin of Species,” and turning to those passages specially cited by Professor Koelliker, we cannot admit that they bear the interpretation he puts upon them.  Darwin, if we read him rightly, does not affirm that every detail in the structure of an animal has been created 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 Koelliker’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, &c. 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:—­