Out of the south the biplane came winging back toward the camp, a black speck against the dazzling white of the vast ice-fields that extended unbroken to the horizon on every side. It came out of the south, and yet, a hundred miles further back along the course on which it flew, it could not have proceeded in any direction except northward. For a hundred miles south lay the south pole, the goal toward which the Travers Expeditions had been pressing for the better part of that year. Not that they could not have reached it sooner. As a matter of fact, the pole had been crossed and re-crossed, according to the estimate of Tommy Travers, aviator, and nephew of the old millionaire who stood fairy uncle to the expedition. But one of the things that was being sought was the exact site of the pole. Not within a couple of miles or so, but within the fraction of an inch. It had something to do with Einstein, and something to do with terrestrial magnetism, and the variations of the south magnetic pole, and the reason therefore, and something to do with parallaxes and the precession of the equinoxes and other things, this search for the pole's exact location. But all that was principally the affair of the astronomer of the party. Tommy Travers, who was now evidently on his way back, didn't give a whoop for Einstein, or any of the rest of the stuff. He had been enjoying himself after his fashion during a year of frostbites and hard rations, and he was beginning to anticipate the delights of the return to Broadway. Captain Storm, in charge of the expedition, together with the five others of the advance camp, watched the plane maneuver up to the tents. She came down neatly on the smooth snow, skidded on her runners like an expert skater, and came to a stop almost immediately in front of the marquee. Tommy Travers leaped out of the enclosed cockpit, which, shut off by glass from the cabin, was something like the front seat of a limousine. "Well, Captain, we followed that break for a hundred miles, and there's no ground cleft, as you expected," he said. "But Jim Dodd and I picked up something, and Jim seems to have gone crazy." * * * * * Through the windows of the cabin, Jim Dodd, the young archaeologist of the party, could be seen apparently wrestling with something that looked like a suit of armor. By the time Captain Storm, Jimmy, and the other members of the party had reached the cabin door, Dodd had got it open and flung himself out backward, still hugging what he had found, and maneuvering so that he managed to fall on his back and sustain its weight. "Say, what the--what--what's that?" gasped Storm.