other queer creatures walk about on four legs, and that the queerest creature of all walks about on two. These are things and not theories; and compared with them evolution and the atom and even the solar system are merely theories. The matter here is one of history and not of philosophy; so that it need only be noted that no philosopher denies that a mystery still attaches to the two great transitions: the origin of the universe itself and the origin of the principle of life itself. Most philosophers have the enlightenment to add that a third mystery attaches to the origin of man himself. In other words, a third bridge was built across a third abyss of the unthinkable when there came into the world what we call reason and what we call will. Man is not merely an evolution but rather a revolution. That he has a backbone or other parts upon a similar pattern to birds and fishes is an obvious fact, whatever be the meaning of the fact. But if we attempt to regard him, as it were, as a quadruped standing on his hind legs, we shall find what follows far more fantastic and subversive than if he were standing on his head.
I will take one example to serve for an introduction to the story of man. It illustrates what I mean by saying that a certain childish directness is needed to see the truth about the childhood of the world. It illustrates what I mean by saying that a mixture of popular science and journalistic jargon have confused the facts about the first things, so that we cannot see which of them really comes first. It illustrates, though only in one convenient illustration, all that I mean by the necessity of seeing the sharp differences that give its shape to history, instead of being submerged in all these generali-
