The following extract from a letter to Mr. Murray (April 13, 1871) refers to a review in the Times[250]:—
"I have no idea who wrote the Times' review. He has no knowledge of science, and seems to me a wind-bag full of metaphysics and classics, so that I do not much regard his adverse judgment, though I suppose it will injure the sale."
A striking review appeared in the Saturday Review (March 4 and 11, 1871) in which the position of Evolution is well stated.
"He claims to have brought man himself, his origin and constitution, within that unity which he had previously sought to trace through all lower animal forms. The growth of opinion in the interval, due in chief measure to his own intermediate works, has placed the discussion of this problem in a position very much in advance of that held by it fifteen years ago. The problem of Evolution is hardly any longer to be treated as one of first principles: nor has Mr. Darwin to do battle for a first hearing of his central hypothesis, upborne as it is by a phalanx of names full of distinction and promise in either hemisphere."
We must now return to the history of the general principle of Evolution. At the beginning of 1869[251] he was at work on the fifth edition of the Origin. The most important alterations were suggested by a remarkable paper in the North British Review (June, 1867) written by the late Fleeming Jenkin.
It is not a little remarkable that the criticisms, which my father, as I believe, felt to be the most valuable ever made on his views should have come, not from a professed naturalist but from a Professor of Engineering.
The point on which Fleeming Jenkin convinced my father is the extreme difficulty of believing that single individuals which differ from their fellows in the possession of some useful character can be the starting point of a new variety. Thus the origin of a new variety is more likely to be found in a species which presents the incipient character in a large number of its individuals. This point of view was of course perfectly familiar to him, it was this that induced him to study "unconscious selection," where a breed is formed by the long-continued preservation by Man of all those individuals which are best adapted to his needs: not as in the art of the professed breeder, where a single individual is picked out to breed from.
It is impossible to give in a short compass an account of Fleeming Jenkin's argument. My father's copy of the paper (ripped out of the volume as usual, and tied with a bit of string) is annotated in pencil in many places. I quote a passage opposite which my father has written "good sneers"—but it should be remembered that he used the word "sneer" in rather a special sense, not as necessarily implying a feeling of bitterness in the critic, but rather in the sense of "banter." Speaking of the "true believer," Fleeming Jenkin says, p. 293:—
"He can invent trains of ancestors of whose existence there is no evidence; he can marshal hosts of equally imaginary foes; he can call up continents, floods, and peculiar atmospheres; he can dry up oceans, split islands, and parcel out eternity at will; surely with these advantages he must be a dull fellow if he cannot scheme some series of animals and circumstances explaining our assumed difficulty quite naturally. Feeling the difficulty of dealing with adversaries who command so huge a domain of fancy, we will abandon these arguments, and trust to those which at least cannot be assailed by mere efforts of imagination."
In the fifth edition of the Origin, my father altered a passage in the Historical Sketch (fourth edition, p. xviii.). He thus practically gave up the difficult task of understanding whether or not Sir R. Owen claims to have discovered the principle of Natural Selection. Adding, "As far as the more enunciation of the principle of Natural Selection is concerned, it is quite immaterial whether or not Professor Owen preceded me, for both of us ... were long ago preceded by Dr. Wells and Mr. Matthew."