Closer now appeared the bottom of the crater, whose floor seemed to be covered with something that looked like blue sand, or rock. From this bluish substance the glow which bathed the two Earthlings seemed to emanate. The funnel of the crater had now given away to the immensities of space, in all directions, and the cold of outside was being replaced by a warmth which promised soon to be even uncomfortable. Then, without a jar, the two landed at the bottom of the crater, side by side, close enough almost to that great cone to touch it. Out of the cone came that bluish column, to shoot up through the funnel down which the two had lightly dropped ... and the motion of the--whatever it was--was accompanied by a muted moaning sound, like that of a distant waterfall. They paused there, in amazement, taking stock of their surroundings. Huge tunnels, whose roofs were lost to invisibility in the bluish haze, whose extremities could only be guessed at, reached off in all directions. As far as the two could tell they were the only living souls within the crater, though both knew better. Sarka had the feeling, and he knew Jaska shared it with him, that innumerable eyes were studying them, innumerable intellects were cataloguing them. And somehow he sensed the presence, somewhere near, of the traitor Dalis! * * * * * Then that discordant sound again, breaking so swiftly that it fell upon the eardrums of Sarka and Jaska like the crack of doom. Out of the many tunnels, from all directions, came hordes of beings which would have made the nightmares of Paracelsus--first of the scientists of Earth--pale to insignificance. Paracelsus had written and illustrated his nightmares. Had hinted of strange acts of flesh-grafting--as the grafting of legs on the head of man. He had spoken, and written about, ghastly operations, from which men came forth as part men, part spiders; part men, part scorpions, dogs, cats, crocodiles.... Sarka thought, as his mind went back to those ancient books of his people in which still remained vestiges of the theories of Paracelsus, that somehow, in his dreams, Paracelsus must have visited the craters of the Moon. These people ... if they could be called people.... They had heads like the heads of Earthlings, broad-domed of brow, lacking eyelashes or lids, so that their eyes were perpetually staring. They possessed no bodies at all, and their legs, thin and attenuated to the size of the wrists of average men, seemed to support the massive heads with difficulty! From all directions they came, looking like spiders such as Sarka the First had described to Sarka, when Sarka had been a mere boy. They came on the floor, out of the tunnels; they dropped from the walls of the tunnels, and down from the invisible roofs, landing on the floor as lightly as feathers--and all converged on Jaska and Sarka. They seemed to have no fear at all, but only a vast curiosity. Closer and closer they came.