Over the huge compartment-city our four cylinders flashed, then slowed and halted, as up from another point in it rose four more cylinders, the four that we had seen land in a different part of it, and whose occupants had discovered and captured us. Then all of the eight great cylinders, our own in the lead, were rising sharply upward, up toward the opening in the vast roof above, through which we had seen them come. As they shot up toward it, Marlin and I, glancing down and backward, could see, even as we had seen from our space-flier, the vast extent of the dead and deserted compartment-city, with its mechanisms and huge globes and high black intersecting walls lying now in such dusty silence and death. Yet it was only for a moment that we glanced back toward it, for now our eight cylinders were flashing up through the round opening in the huge roof, and out over that vast roof, seeming solid metal from above, that covered all of mighty Neptune. And as we flashed over it, now, I found for the first time opportunity to whisper to Marlin, beside me.

"They're leaving Neptune!" I whispered. "Where can they be going, Marlin? And what has happened to Whitely and Randall?"

He shook his head, answered in the same low tones. "Whitely and Randall have escaped, I hope. They had a small start on their pursuers—they may have eluded them here above Neptune——"

We were abruptly silent as the guards glanced suspiciously toward us with their bulging multiple eyes. And as the great cylinder and those behind shot on, the huge metal roof of Neptune below and the vast vapor-masses of its dense atmosphere stretched above us, I wondered if ever men had found themselves in the position that now was ours. Captured by monstrous disk-bodied beings of horror unutterable, flashing with them above the vast roof that sheathed Neptune and its dead, deserted and colossal compartment-city, to a destination of which we could not dream! And as that thought passed, another came, and I remembered the great mission that had brought us out here to the terrors of mighty Neptune, our great flight outward to find and put an end to the huge force-ray that was stabbing across the solar system and turning the sun ever faster, with every day bringing it nearer to the division that meant doom for almost all its universe. What chance was ours to accomplish that mission now, separated and captured as we were, not knowing even from what source the great ray was issuing, from what strange place these disk-bodied beings had come and to which they were now returning?

I was aroused from my silent despair, though, by a low exclamation from Marlin, and looked up to see that the cylinders of which our own was foremost had now halted, hanging midway between metal roof beneath and great vapor-masses above. Then down from above I saw, dropping quickly toward us, three other cylinders similar to the eight, three cylinders at sight of which my heart beat suddenly faster. For it had been three cylinders that had pursued Whitely and Randall in the space-flier! Tensely I watched as the three drove down among our eight, and then one of them had shot suddenly close to the cylinder in which we were, hanging beside it so that its low door-opening was directly touching the door-opening of our own. There was a clang of metal beneath as the doors of both cylinders slid aside. They fitted so closely against each other that no colder air from without could enter into the warmed interior of the two cylinders. Then from the other were coming into our own cylinder three Neptunians who climbed swiftly up into the top-section in which we were, while Marlin and I watched them in indescribable suspense.

As they came up into the uppermost section they spoke in their sharp, staccato talk to the Neptunian leader of the crimson-circle insignia, making report to him, it was apparent. But it was not to their snapping speech that Marlin and I gave our attention, but to the things they carried in their grip, and which they were showing to the leader. Those things, I saw with a start of horror, were some shattered and crumpled plates of metal, great flat metal plates that I recognized immediately as being of our space-flier's faceted sides! And they also held a broken, twisted metal thing that I recognized instantly as one of the space-flier's smaller liquid-oxygen tanks! I needed not to understand the strange speech of the Neptunians in that moment to understand what the three were reporting. For those shattered fragments of the space-flier told the tale with terrible clearness.

"Whitely and Randall!" It was Marlin's whisper of horror beside me. "They were caught by those pursuing cylinders—were annihilated by their rays——!"

"Whitely and Randall——" I felt my voice choke then, as I gazed at those last fragments of the space-flier's wreckage, mutely testifying to the end which our friends had met with beneath the shattering rays in their space-flier somewhere in the cold, vast vapor-masses above us.

Whitely—cool and detached and steady, stirred to passion by nothing save some unprecedented physical phenomenon, considering with curious, impersonal eyes each new peril that had confronted us; and Randall—with his sunny hair and eager young courage and unfailing sense of fun; it was as though they had risen before me in that moment, when we saw at last what death had overtaken them and our space-flier there in the chill clouds of mighty Neptune. I felt Marlin's steadying hand on my shoulder and knew that he was sounding similar depths of despair. For with Whitely and Randall gone, with our space-flier and with ourselves captured and held by these monstrous disk-bodied Neptunians who yet seemed not of Neptune, our chance to halt the great doom-ray that was radiating toward the sun, our chance even to return to Earth with word of the position and nature of that ray's source, was gone also!

Through the despair that had sunken upon me I was aware, in a moment, that the throbbing of the cylinder's great generators had waxed again in intensity. Already the three Neptunians, who had reported the destruction of the space-flier, had returned to their own cylinder, which had separated from ours, and now the whole eleven cylinders, our own in the lead, were racing forward once more, were shooting forward between the great vapor-masses above and the vast metal roof below. At immense and mounting speed they shot forward, a dull roar of whistling air coming to us from without, and in a moment the pale, dim light about us had begun to change to dusk, to darkness, as we shot on. For the eleven cylinders were racing around the surface of Neptune toward the side of it away from the sun at the moment, and as they entered the shade of that side they were plunging through the eternal night. But as the cylinders shot on they seemed to need no light or star to guide them through the deep darkness, though all that was visible was an occasional glinting of the great metal roof below.