"Mason, that device was no booster. It was a time machine, so devised as to catapult the ship not into outer space, but into the space-time continuum. It was a mechanism designed to throw the Marie Galante forward into the future."

A cloud of fear began to well over me. "What do you mean?" I said again.

Navigator Norris paced around his desk. "I mean that the Marie Galante has not once left Earth, has not in fact left the spot of its moorings but has merely gone forward in time. I mean that the nine 'landings' we made were not stops on some other planets but halting stages of a journey into the future."

Had a bombshell burst over my head the effect could have been no greater. Cold perspiration began to ooze out on my forehead. In a flash I saw the significance of the entire situation. That was why Norris had been so insistent that we always return to the ship before dark. He didn't want us to see the night sky and the constellations there for fear we would guess the truth. That was why he had never permitted any of us in the bridge cuddy and why he had kept all ports and observation shields closed.

"But the names of the planets ... Coulora, Stragella, and the others and their positions on the chart...?" I objected.

Norris smiled grimly. "All words created out of my imagination. Like the rest of you, I knew nothing of the true action of the booster. It was only gradually that truth dawned on me. But by the time we had made our first 'landing' I had guessed. That was why I demanded we always take organic surveyor readings. I knew we had traveled far into future time, far beyond the life period of man on Earth. But I wasn't sure how far we had gone, and I lived with the hope that Klae's booster might reverse itself and start carrying us backwards down the centuries."

For a long time I stood there in silence, a thousand mad speculations racing through my mind.

"How about that piece of Indurate?" I said at length. "It was chipped off an image in the ruins of a great building a mile or so from here."

"An image?" repeated Norris. A faint glow of interest slowly rose in his eyes. Then it died. "I don't know," he said. "It would seem to presuppose that the formula, both parts of it, was known by Klae and that he left it for posterity to discover."

All this time Mason had been standing there, eyes smouldering, lips an ugly line. Now abruptly he took a step forward.