Far ahead, over the tops of several waves of ground, another car was coming. A small black speck, it went down out of sight, and came up bigger; the next time it was bigger yet; the next time—it was on the slope above you, rushing at you, faster and faster, a mighty projectile hurled out of a six-foot cannon. Now came a moment to test the nerve of a motorist. The magic ribbon of concrete had no stretching powers. The ground at the sides had been prepared for emergencies, but you could not always be sure how well it had been prepared, and if you went off at fifty miles an hour you would get disagreeable waverings of the wheels; you might find the neatly trimmed concrete raised several inches above the earth at the side of it, forcing you to run along on the earth until you could find a place to swing in again; there might be soft sand, which would swerve you this way and that, or wet clay which would skid you, and put a sudden end to your journey. So the laws of good driving forbade you to go off the magic ribbon except in extreme emergencies. You were ethically entitled to several inches of margin at the right-hand edge; and the man approaching you was entitled to an equal number of inches; which left a remainder of inches between the two projectiles as they shot by. It sounds risky as one tells it, but the heavens are run on the basis of similar calculations, and while collisions do happen, they leave time enough in between for universes to be formed, and successful careers conducted by men of affairs. “Whoosh!” went the other projectile, hurtling past; a loud, swift “Whoosh!” with no tapering off at the end. You had a glimpse of another man with horn-rimmed spectacles like yourself, with a similar grip of two hands upon a steering-wheel, and a similar cataleptic fixation of the eyes. You never looked back; for at fifty miles an hour, your business is with the things that lie before you, and the past is past—or shall we say that the passed are passed? Presently would come another car, and again it would be necessary for you to leave the comfortable centre of the concrete ribbon, and content yourself with a precisely estimated one-half minus a certain number of inches. Each time, you were staking your life upon your ability to place your car upon the exact line—and upon the ability and willingness of the unknown other party to do the same. You watched his projectile in the instant of hurtling at you, and if you saw that he was not making the necessary concession, you knew that you were encountering that most dangerous of all two-legged mammalian creatures, the road-hog. Or maybe it was a drunken man, or just a woman—there was no time to find out; you had the thousandth part of a second in which to shift your steering-wheel the tenth part of an inch, and run your right wheels off onto the dirt.