Never could there have been flight more nightmare-like than that of Marlin and myself through the dark compartments of Triton's dark side, in blind search for the cylinders which alone held out to us any chance of escape. Through the sleep-compartments, with their masses of open-eyed and sleeping disk-bodied Neptunians, through the compartments where reared the great glowing globes whose radiated heat alone held back the cold doom that so long had threatened these strange beings, through compartment after compartment in a flight made more grotesque and unreal to us by the strange method of our progress; by the strange, great, smooth leaps that we made instead of steps, great floating leaps of a score of feet in which we rushed through the dark sleeping compartments, reckless now of the few Neptunians who might be waking and moving upon the dark side. Then suddenly as we leaped toward the door of still another sleep-compartment, poised an instant to leap through that low door, we halted, gazed with abruptly-flaring hope ahead. For the next compartment, we saw, was a rectangular one and greater in size than any we had passed through as yet, and in it there stood the great gleaming shapes of a score or more of the cylinder-fliers that we sought! With hearts pounding Marlin and I crouched in the low door, gazing through the darkness toward those great cylinders, that gleamed a little in the feeble light that came down upon Triton's dark side from the stars through the great roof overhead. We saw that the low doors in the sides of those cylinders, near the bases, were open, and from them there came to us the throbbing of their mechanisms, inside! It was evident that these were part of the countless cylinders used to help in transporting the Neptunian hordes from dark side to sunward side of Triton, and _vice versa_, and it was equally evident from those throbbing mechanisms' operation, that the hour of awakening for those hordes was at hand and that these were waiting for that awakening. For there stood also, between us and the nearest of the cylinders, three tube-armed Neptunians who were conversing in brief, snapping speech as they waited! * * * * *