Big Bill lumbered swiftly forward across the frozen ground, and behind him came the rest of the work gang—a score of bent and mighty manlike shapes, draped like Big Bill from head to foot in long white hair. They moved in a straggling group, but the rhythmic side sway of the great bodies was more uniform than the tread of marching men. Their red eyes peered ahead through the noonday twilight toward the landing strip two hundred yards away, slashed clean and straight across the ragged low-gravity