As the two men conversed I had recalled that part of the story that Nur An had told me in the pits of Tjanath which related to Phor Tak and his invention of the rifle that projected the disintegrating rays which had proved so deadly against the patrol boat above Helium the night of Sanoma Tora's abduction. Strange, indeed, was fate that it should have brought me into the palace of the man who held the secret that might mean so much to Helium and to all Barsoom. Strange, too, and devious had been the path along which fate had led me, yet I knew that my ancestors were guiding me and that all must have been arranged to some good end. When Phor Tak had heard only a portion of our story he insisted that we must be both fatigued and hungry and, like the good host that he proved to be, he conducted us down to the interior of his palace and, summoning slaves, ordered that we be bathed and fed and then permitted to retire until we were rested. We thanked him for his kindness and consideration, of which we were glad to avail ourselves. The days that followed were both interesting and profitable. Phor Tak, surrounded only by a few faithful slaves who had followed him into his exile, was delighted with our company and with the assistance which we could give him in his experiment, which, once assured of our loyalty, he explained to us in detail. He told us the story of his wanderings after he had left Jahar and of how he had stumbled upon this long deserted castle, whose builder and occupants had left no record other than their bones. He told us that when he discovered it skeletons had strewn the courtyard and in the main entrance were piled the bones of a score of warriors, attesting the fierce defense that the occupants had waged against some unknown enemy, while in many of the upper rooms he had found other skeletons--the skeletons of women and children. "I believe," he said, "that the place was beset by members of some savage horde of green warriors that left not a single survivor. The courts and gardens were overgrown with weeds and the interior of the building was filled with dust, but otherwise little damage had been done. I call it Jhama, and here I am carrying on my life's work." "And that?" I asked. "Revenge upon Tul Axtar," said the old man. "I gave him the disintegrating ray; I gave him the insulating paint that protects his own ships and weapons from it, and now some day I shall give him something else--something that will be as revolutionary in the art of war as the disintegrating ray itself; something that will cast the fleet of Jahar broken wrecks upon the ground; something that will search out the palace of Tul Axtar and bury the tyrant beneath its ruins."