not perplex my
infant mind in the least: I knew perfectly well, without knowing that I
knew it, that the validity of a story is not the same as the occurrence
of a fact. But as I grew up I found that I had to choose between
Evolution and Genesis. If you believed that dogs and cats and snakes
and birds and beetles and oysters and whales and men and women were all
separately designed and made and named in Eden garden at the beginning
of things, and have since survived simply by reproducing their kind,
then you were not an Evolutionist. If you believed, on the contrary,
that all the different species are modifications, variations, and
elaborations of one primal stock, or even of a few primal stocks, then
you were an Evolutionist. But you were not necessarily a Darwinian; for
you might have been a modern Evolutionist twenty years before Charles
Darwin was born, and a whole lifetime before he published his Origin of
Species. For that matter, when Aristotle grouped animals with backbones
as blood relations, he began the sort of classification which, when
extended by Darwin to monkeys and men, so shocked my uncle.

Genesis had held the field until the time (1707-1778) of Linnaeus the
famous botanist. In the meantime the microscope had been invented. It
revealed a new world of hitherto invisible creatures called Infusorians,
as common water was found to be an infusion of them. In the eighteenth
century naturalists were very keen on the Infusorian Amoebas, and were
much struck by the way in which the members of this old family behaved
and developed. But it was still possible for Linnaeus to begin a
treatise by saying 'There are just so many species as there were forms
created in the beginning,' though there were hundreds of commonplace
Scotch gardeners, pigeon fanciers, and stock breeders then living who
knew better. Linnaeus himself knew better before he died. In the
last edition of his System of Nature, he began to wonder whether the
transmutation of species by variation might not be possible. Then came
the great poet who jumped over the facts to the conclusion. Goethe said
that all the shapes of creation were cousins; that there must be some
common stock from which all the species had sprung; that it was the
environment of air that had produced the eagle, of water the seal, and
of earth the mole. He could not say how this happened; but he divined
that it did happen. Erasmus Darwin, the grandfather of Charles, carried
the envi