And now it had vanished. Suddenly, unaccountably it had taken on that terrific burst of speed which I have described. In ten minutes it had become a speck on the far horizon—in another instant it was gone. We were alone. Night was falling. If we turned back our gas might bring us to safety. If we went on—what?
I turned to my companions. Foulet still maintained his non-committal attitude, but Brice was deeply disappointed and worried. His ruddy English face was knotted in a scowl and his blue eyes were dark. Quickly he jerked his head back. We understood. Of course, turning back was the only thing to do; to go on was absurd. Our quarry had totally disappeared. But it was heart-breaking. Once again we had been fooled and outwitted. Our disappointment filled that tiny cockpit like a tangible mist. Brice threw over the stick with a gesture of disgust. In response our right wing lifted a bit, seemed to shake itself, then settled—and the plane continued on its course. Brice's eyes flickered with surprise. He shoved the stick back, threw it over again, but toward the opposite side. Obediently our left wing lifted as if to bank, a shudder passed through it, it dropped, the plane leveled, and went on.
Foulet leaned forward, his eyes were gleaming, his face flushed and eager. "Climb!" he yelled above the roar of the motors. "Up!" Brice nodded—but it was no use. That plane was like a live thing; nothing we could do would swerve it from its course. We stared at one another. Were we mad? Were we under a hypnotic spell? But our minds were clear, and the idea of hypnosis was absurd, for we had tried to turn back. It was the machine that refused to obey.
Again Foulet leaned forward. "Drop!" he shouted. Brice nodded, but the plane refused to respond. On and on, straight as a die, it sped.
"Try slowing the motor," I yelled into Brice's ear and both Foulet and I leaned forward to watch results.
The motors slowed. Gradually the roaring, pounding hum lessened, and our speed continued! The whine of the wind in the wires abated not one whit! The speedometer on our instrument board climbed!
Brice turned. His face, in the deepening dusk, was a blur of pasty white. His hands hung at his sides. The motors purred, pulsed, were silent. The plane, unaided, unguided, flew alone!
We sat hushed and unbelieving in that terrible, deathlike silence. Our ears, attuned all day to the deafening roar of the motors, felt as if they would burst in the sudden, agonizing stillness. There was not a sound save the whine of the wind in the wires as the plane sped on. Above us curved the illimitable arch of darkening sky. Below us lay the empty stretch of blank desert.