For wheels are the mark of a man quite as much as wings are the mark of an angel. Wheels are the things that are as old as mankind and yet are strictly peculiar to man, that are prehistoric but not pre-human.
A distinguished psychologist, who is well acquainted with physiology, has told me that parts of himself are certainly levers, while other parts are probably pulleys, but that after feeling himself carefully all over, he cannot find a wheel anywhere. The wheel, as a mode of movement, is a purely human thing. On the ancient escutcheon of Adam (which, like much of the rest of his costume, has not yet been discovered) the heraldic emblem was a wheel--passant. As a mode of progress, I say, it is unique. Many modern philosophers, like my friend before mentioned, are ready to find links between man and beast, and to show that man has been in all things the blind slave of his mother earth. Some, of a very different kind, are even eager to show it; especially if it can be twisted to the discredit of religion. But even the most eager scientists have often admitted in my hearing that they would be surprised if some kind of cow approached them moving solemnly on four wheels. Wings, fins, flappers, claws, hoofs, webs, trotters, with all these the fantastic families of the earth come against us and close around us, fluttering