"Well, I'll take _my_ chances with 'em. Better a fight, say I, with my own kind, than solitude like this--you and I all alone, girl, getting old some time and dying with never a hand-clasp save perhaps such as it may please fate to give us from whatever children are to be. But come, come, girl. No time for gloomy speculations of trouble. In you get now, and off we go--westward bound again." Only half an hour out of Detroit it was that they first became aware of some strange disturbance of the horizon, some inexplicable appearance such as neither of them had ever seen, a phenomenon so peculiar that, though both observed it at about the same time, neither Stern could believe his own senses nor Beatrice hers. For all at once it seemed to them the sky-line was drawing suddenly nearer; it seemed that the horizon was approaching at high speed. The dark, untrodden forest mass still stretched away, away, until it vanished against the dim blue of the sky; but now, instead of that meeting-line being forty miles off, it seemed no farther than twenty, and minute by minute it indubitably was rushing toward them with a speed equal to their own. Stern, puzzled and alarmed at this unusual sight, felt an impulse to slow, to swerve, to test the apparition in some way; but second thought convinced him it must be deception of some sort. "Some peculiar state of the atmosphere," thought he, "or perhaps we're approaching a high ridge, on the other side of which lie clouds that cut away the farther view. Or else--no, hang it! the world seems to end right there, with no clouds to veil it--nothing, only--what?" He saw the girl pointing in alarm. She, too, was clearly stirred by the appearance. What to do? Stern felt indecision for the first time since he had started on this long, adventurous journey. Shut off and descend? Impossible among those forests. Swing about and return? Not to be thought of. Keep on and meet perils perhaps undreamed of? Yes--at all hazards he would keep on. And with a tightening of the jaw he drove the Pauillac onward, ever onward--toward the empty space that yawned ahead. "End o' the world?" thought he. "All right, the old machine is good for it, and so are we. Here goes!" CHAPTER XX ON THE LIP OF THE CHASM Very near, now, was the strange apparition. On, on, swift as a falcon, the plane hurtled. Stern glanced at Beatrice. Never had he seen her more beautiful. About her face, rosy and full of life, the luxuriant loose hair was whipping. Her eyes sparkled with this new excitement, and on her full red lips a smile betrayed her keen enjoyment. No trace of fear was there--nothing but confidence and strength and joy in the adventure. The phenomenon of the world's end--for nothing else describes it adequately--now appeared distinctly as a jagged line, beyond which nothing showed. It differed from the horizon line, inasmuch as it was close at hand. Already the adventurers could peer down upon it at an acute angle.