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I am well aware that in describing the effect of Darwin's discovery on naturalists and on persons capable of serious reflection on the nature and attributes of God, I am leaving the vast mass of the British public out of account. I have pointed out elsewhere that the British nation does not consist of atheists and Plymouth Brothers; and I am not now going to pretend that it ever consisted of Darwinians and Lamarckians. The average citizen is irreligious and unscientific: you talk to him about cricket and golf, market prices and party politics, not about evolution and relativity, transubstantiation and predestination. Nothing will knock into his head the fateful distinction between Evolution as promulgated by Erasmus Darwin, and Circumstantial (so-called Natural) Selection as revealed by his grandson. Yet the doctrine of Charles reached him, though the doctrine of Erasmus had passed over his head. Why did not Erasmus Darwin popularize the word Evolution as effectively as Charles?

The reason was, I think, that Circumstantial Selection is easier to understand, more visible and concrete, than Lamarckian evolution. Evolution as a philosophy and physiology of the will is a mystical process, which can be apprehended only by a trained, apt, and comprehensive thinker. Though the phenomena of use and disuse, of wanting and trying, of the manufacture of weight lifters and wrestlers from men of ordinary strength, are familiar enough as facts, they are extremely puzzling as subjects of thought, and lead you into metaphysics the moment you try to account for them. But pigeon fanciers, dog fanciers, gardeners, stock breeders, or stud grooms, can understand Circumstantial Selection, because it is their business to produce transformation by imposing on flowers and animals a Selection From Without. All that Darwin had to say to them was that the mere chapter of accidents is always doing on a huge scale what they themselves are doing on a very small scale. There is hardly a laborer attached to an English country house who has not taken a litter of kittens or puppies to the bucket, and drowned all of them except the one he thinks the most promising. Such a man has nothing to learn about the survival of the fittest except that it acts in more ways than he has yet noticed; for he knows quite well, as you will find if you are not too proud to talk to him, that this sort of selection occurs naturally (in Darwin's sense) too: that, for instance, a hard winter will kill off a weakly child as the bucket kills off a weakly puppy. Then there is the farm laborer. Shakespear's Touchstone, a court-bred fool, was shocked to find in the shepherd a natural philosopher, and opined that he would be damned for the part he took in the sexual selection of sheep. As to the production of new species by the selection of variations, that is no news to your gardener. Now if you are familiar with these three processes: the survival of the fittest, sexual selection, and variation leading to new kinds, there is nothing to puzzle you in Darwinism.

That was the secret of Darwin's popularity. He never puzzled anybody. If very few of us have read The Origin of Species from end to end, it is not because it overtaxes our mind, but because we take in the whole case and are prepared to accept it long before we have come to the end of the innumerable instances and illustrations of which the book mainly consists. Darwin becomes tedious in the manner of a man who insists on continuing to prove his innocence after he has been acquitted. You assure him that there is not a stain on his character, and beg him to leave the court; but he will not be content with enough evidence: he will have you listen to all the evidence that exists in the world. Darwin's industry was enormous. His patience, his perseverance, his conscientiousness reached the human limit. But he never got deeper beneath or higher above his facts than an ordinary man could follow him. He was not conscious of having raised a stupendous issue, because, though it arose instantly, it was not his business. He was conscious of having discovered a process of transformation and modification which accounted for a great deal of natural history. But he did not put it forward as accounting for the whole of natural history. He included it under the heading of Evolution, though it was only pseudo-evolution at best; but he revealed it as a method of evolution, not as the method of evolution. He did not pretend that it excluded other methods, or that it was the chief method. Though he demonstrated that many transformations which had been taken as functional adaptations (the current phrase for Lamarckian evolution) either certainly were or conceivably might be due to Circumstantial Selection, he was careful not to claim that he had superseded Lamarck or disproved Functional Adaptation. In short, he was not a Darwinian, but an honest naturalist working away at his job with so little preoccupation with theological speculation that he never quarrelled with the theistic Unitarianism into which he was born, and remained to the end the engagingly simple and socially easy-going soul he had been in his boyhood, when his elders doubted whether he would ever be of much use in the world.