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