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.
Plainly could they see the outlines of trees growing along the verge. But beyond them, nothing.
It differed essentially from a canyon, because there was no other side at all. Strain his eye as he might, Stern could detect no opposite wall. And now, realizing something of the possibilities of such a chasm, he swung the Pauillac southward. Flying parallel to the edge of this tremendous barrier, he sought to solve the mystery of its true nature.
"If I go higher, perhaps I may be able to get some notion of it," thought he, and swinging up-wind, he spiraled till the barometer showed he had gained another thousand feet.
But even this additional view profited him nothing. Half a mile to westward the ragged tree-line still showed as before, with vacancy behind it, and as far as Stern could see to north, to south, it stretched away till the dim blue of distance swallowed it. Yet, straight across the gulf, no land appeared. Only the sky itself was visible there, as calm and as unbroken as in the zenith, yet extending far below where the horizon-line should have been--down, in fact, to where the tree-line cut it off from Stern's vision.
The effect was precisely that of coming to the edge of a vast plain, beyond which nothing lay, save space, and peering over.
"The end of the world, indeed!" thought the engineer, despite himself. "But what can it mean? What can have happened to the sphere to have changed it like this? Good Heavens, what a marvel--what a catastrophe!"
Determined at all hazards to know more of this titanic break or "fault," or whatsoever it might be, he banked again, and now, on a descending slant, veered down toward the lip of the chasm.
"Going out over it?" cried Beatrice.
He nodded.
"It may be miles deep!"
"You can't get killed any deader falling a hundred miles than you can a hundred feet!" he shouted back, above the droning racket of the motor.