"Halloo! The gas is poisonous! Leap through, save yourselves! Climb out, or it will kill you!" "Bear up!" I heard the doctor's voice begin, "one minute more and we----" Then there was a violent coughing, a door slammed, and the voice was barely heard--afar off--as through a wall. Had they escaped, then, to another room? I had no further time to puzzle what it meant, for another slab of my floor rose, wavered and fell over with a crash, and up through the purplish gas I could see a great round black thing rising, stretching high up into the room until its top almost touched the roof. My God! _It was the projectile!_ When the breach in the floor was cleared, all the gas rushed down into the lower chamber. The projectile eased over on its side, and out of the rear port-hole came Hotep with a revolver and a sword. He soon had me cut loose, and then he told me how it all had happened. He had been chamberlain but a single day when he discovered the existence of a secret subterranean chamber under the ante-room of the banquet hall. His curiosity led him to explore this, and in its darkest recess, unseen at first entrance, he found our projectile. It had been there ever since the day of its disappearance. During our interview before Zaphnath and the wise men, they had learned from us that others could not come from Earth without the projectile, and that we had left no third person in charge of it. It must have been with an order to make away with the projectile, and to secrete it in this chamber, that the third messenger had been dispatched that day. Also on my first evening in this very ante-room, I had heard Two-spot barking in the chamber below, and the servant, on hearing him too, had him hastily released, lest he should betray the hiding-place. As soon as Hotep had found the projectile, he had sent for us, but it was the doctor alone who joined him. They two had been busy all that day and night repairing the projectile and storing it anew. In this manner the doctor had escaped the soldiers who came at daybreak to capture us both. Beyond the projectile, Hotep had discovered a secret passage leading outside the palace walls, which they could use on their errands of repairs without being observed.