And so great hopes went with him, and the smallest check upon them could set his heart beating. Of these the most considerable came at the moment when he headed his machine for the twin-peaked Weisshorn. His brother and the abbé had warned him against the currents of the Valley of Zermatt; but so triumphant had been his progression to this time that he had forgotten the warnings or derided them. Now they returned as an echo to which he must listen. Suddenly, and without any warning at all, he felt himself sinking toward the valley. It was just as though the whole machine dropped rapidly, had lost stability, and would go hurtling down to the abyss as a bird that is shot. In vain he raised his elevating plane to its full capacity. The shell continued its headlong flight, its nose dipped downwards, its engine raced wildly. Then, as suddenly, he regained his balance, went a little way upon an even keel, and discovered that his engine had almost ceased to run. It ebbed away as a life that gasps for air—sobbed out a requiem. And that drove him almost mad with terror; for a spell his wit failed him altogether; he sat back in his chair and looked death in the face. But it was for an instant, no more. There is this in the instinct of a true mechanic, that whatever the emergency, his mind will grasp the meaning of it before the minds of others, and he will be the first to act. Even as death looked him in the face, Benny could say that the engine had ceased to run because the petrol supply had failed. Turning in his seat he lifted the needles valve, and then struck the side of his tank a fierce blow. As swiftly as the engine had failed, as swiftly it took up the drive again. He heard the hum of it; watched the great propeller racing, and then looked ahead of him to regain his course. There had been a margin of ten seconds perhaps between salvation and the ultimate calamity. He was as white as the snow beneath him when he understood the truth. A vast black precipice of rock loomed up the third of a mile away. Unable to see more than its jagged face, Benny swung his machine to port, then soared without a break until he had lost all sense of locality, and the air was so bitterly cold that his very breath turned to ice. Now a great white cloud enveloped him. He looked vainly to his compass for help, but the needle oscillated so violently that north and south had no meaning. Descending a little way, he discovered that he was circling about Monte Rosa, and that the plains of Italy called him once more. Then despair seized upon him—the despair of a man who wanders by night, lost to all sense of direction, and vainly seeking lights upon a strange horizon.