No sensation now was there of falling. All motion seemed to lie in the uprushing vapors, dense and warm and pale violet in hue. A vast and rhythmic spiraling had possessed the Pauillac. As you have seen a falling leaf turn in air, so the plane circled, boring with terrific speed down, down, down through the mists, down into the unknown! Nothing to be seen but vapors. No solid body, no land, no earth to mark their fall and gauge it. Yet slowly, steadily, darkness was shrouding them. And Stern, breathing with great difficulty even in the shelter of his arms, could now hardly more than see as a pale blur the white face of the girl beside him. The vast wings of the machine, swirling, swooping, plunging down, loomed hugely vague in the deepening shadows. Dizzy, sick with the monstrous caroming through space, deafened by the thunderous roaring of the up-draft, Stern was still able to retain enough of his scientific curiosity to peer upward. The sun! Could he still see it? Vanished utterly was now the glorious orb! There, seeming to circle round and round in drunken spirals, he beheld a weird, diffused, angry-looking blotch of light, tinted a hue different from any ever seen on earth by men. And involuntarily, at sight of this, he shuddered. Already with the prescience of death full upon him, with a numb despair clutching his soul, he shrank from that ghastly, hideous aspect of what he knew must be his last sight of the sun. Around the girl he drew his right arm; she felt his muscles tauten as he clasped her to him. Useless now, he knew, any further struggles with the aeroplane. Its speed, its plummetlike drop checked only by the huge sweep of its parachute wings, Stern knew now it must fall clear to the bottom of the abyss--if bottom there were. And if not--what then? Stern dared not think. All human concepts had been shattered by this stupendous catastrophe. The sickly and unnatural hue of the rushing vapors that tore and slatted the planes, confused his senses; and, added to this, a stifling, numbing gas seemed diffused through the inchoate void. He tried to speak, but could not. Against the girl's cheek he pressed his own. Hers was cold! In vain he struggled to cry out. Even had his parched tongue been able to voice a sound, the howling tempest they themselves were creating as they fell, would have whipped the shout away and drowned it in the gloom. In Stern's ears roared a droning as of a billion hornets. He felt a vast, tremendous lassitude. Inside his head it seemed as though a huge, merciless pressure were grinding at his very brain. His breath came only slowly and with great difficulty. "My God!" he panted. "Oh, for a little fuel! Oh, for a chance--a chance to fight--for life!"