He had but a vague fleeting impression of a huge knotty form, bent and grotesque. Its arms were so long that its big hands almost dragged on the floor. Its head was very large and bulbous. The pair had seemed to carry something heavy between them, but Austin had not seen what it was. In a moment the Martian had opened a door in the side of the passage and the two had vanished into it. When Austin had returned to his stateroom, he was not quite sure he had really seen the monstrous horror. Surely nothing like it was known to exist within the orbit of Jupiter! Shelby had thought of reporting the incident to the commander of the vessel, but he had dismissed the idea as too pointless. Now, however, the memory of that vague black form was haunting him. He knew that it was the key, in part at least, to his feeling toward Hekalu Selba. The Martian had cast his magazine aside. He was patting the soft cushions of the divan on which he was lounging. "Sit here, my friends," he said in his smooth, precise English. "We shall talk, and then perhaps we shall have a little refreshment." The two complied. "It will be only for a moment," said the girl. "The ship lands in an hour, and I haven't gathered my things together yet." Shelby was intensely interested in this queer individual, about whose personality there lingered a strangely indefinable web of mystery--of evil, almost. "So you too have a passion for mechanics," he said. "Somewhere I am sure I have heard of you before. Kelang Aggar, an instructor of mine at Taboor, spoke occasionally of a young Martian student--" "Kelang Aggar is my friend," Hekki broke in. "He assisted me with several experiments. But they were nothing--a new alloy, very hard, and having a high point of fusion. The heads of the Space Ship Construction Company said it was ideal for rocket nozzles, but they paid me a mere pittance for the invention. This, and a few even lesser ones are my sole accomplishments in the line of mechanics." Hekalu Selba laughed lightly. "Let us talk of other things, my friends," he continued. "Let us allow our minds to ramble. See those two beautiful potted palms over there--children of the deserts of Earth, and beside them the slender graceful stem of the purple Kelan, dug from the marshes along the Selgur waterway of my own planet. I have seen them both in their native habitat, waving their fronds as though in cadence with some great silent symphony of the universe. See that tapestry over yonder, with the beast woven into it?" * * * * * Here Janice Darell pointed up toward the flattened glass dome that roofed the room. "There is old Mother Earth looking down at us, and the sun is peeping around her rim," she said. "See how the light of Sol sifts through the terrestrial atmosphere. There is a streak of red, of gold, of opal, and beyond are the stars and the blackness of space." "The contrast of the forces of darkness with those of light," Shelby put in softly.