Yet within a few minutes of his incarceration Tarzan had commenced to undertake his escape. The old knife in his pouch was brought into requisition and slowly the ape-man began to scrape and chip away the stone from about the bars of one of the windows. It was slow work but Tarzan had the patience of absolute health.

Each day food and water were brought him and slipped quickly beneath the smaller door which was raised just sufficiently to allow the stone receptacles to pass in. The prisoner began to believe that he was being preserved for something beside lions. However that was immaterial. If they would but hold off for a few more days they might select what fate they would—he would not be there when they arrived to announce it.

And then one day came Pan-sat, Lu-don's chief tool, to the city of Tu-lur. He came ostensibly with a fair message for Mo-sar from the high priest at A-lur. Lu-don had decided that Mo-sar should be king and he invited Mo-sar to come at once to A-lur and then Pan-sat, having delivered the message, asked that he might go to the temple of Tu-lur and pray, and there he sought the high priest of Tu-lur to whom was the true message that Lu-don had sent. The two were closeted alone in a little chamber and Pan-sat whispered into the ear of the high priest.

"Mo-sar wishes to be king," he said, "and Lu-don wishes to be king. Mo-sar wishes to retain the stranger who claims to be the Dor-ul-Otho and Lu-don wishes to kill him, and now," he leaned even closer to the ear of the high priest of Tu-lur, "if you would be high priest at A-lur it is within your power."

Pan-sat ceased speaking and waited for the other's reply. The high priest was visibly affected. To be high priest at A-lur! That was almost as good as being king of all Pal-ul-don, for great were the powers of him who conducted the sacrifices upon the altars of A-lur.

"How?" whispered the high priest. "How may I become high priest at A-lur?"

Again Pan-sat leaned close: "By killing the one and bringing the other to A-lur," replied he. Then he rose and departed knowing chat the other had swallowed the bait and could be depended upon to do whatever was required to win him the great prize.

Nor was Pan-sat mistaken other than in one trivial consideration. This high priest would indeed commit murder and treason to attain the high office at A-lur; but he had misunderstood which of his victims was to be killed and which to be delivered to Lu-don. Pan-sat, knowing himself all the details of the plannings of Lu-don, had made the quite natural error of assuming that the ocher was perfectly aware that only by publicly sacrificing the false Dor-ul-Otho could the high priest at A-lur bolster his waning power and that the assassination of Mo-sar, the pretender, would remove from Lu-don's camp the only obstacle to his combining the offices of high priest and king. The high priest at Tu-lur thought that he had been commissioned to kill Tarzan and bring Mo-sar to A-lur. He also thought that when he had done these things he would be made high priest at A-lur; but he did not know that already the priest had been selected who was to murder him within the hour that he arrived at A-lur, nor did he know that a secret grave had been prepared for him in the floor of a subterranean chamber in the very temple he dreamed of controlling.

And so when he should have been arranging the assassination of his chief he was leading a dozen heavily bribed warriors through the dark corridors beneath the temple to slay Tarzan in the lion pit. Night had fallen. A single torch guided the footsteps of the murderers as they crept stealthily upon their evil way, for they knew that they were doing the thing that their chief did not want done and their guilty consciences warned them to stealth.

In the dark of his cell the ape-man worked at his seemingly endless chipping and scraping. His keen ears detected the coming of footsteps along the corridor without—footsteps that approached the larger door. Always before had they come to the smaller door—the footsteps of a single slave who brought his food. This time there were many more than one and their coming at this time of night carried a sinister suggestion. Tarzan continued to work at his scraping and chipping. He heard them stop beyond the door. All was silence broken only by the scrape, scrape, scrape of the ape-man's tireless blade.

Those without heard it and listening sought to explain it. They whispered in low tones making their plans. Two would raise the door quickly and the others would rush in and hurl their clubs at the prisoner. They would take no chances, for the stories that had circulated in A-lur had been brought to Tu-lur—stories of the great strength and wonderful prowess of Tarzan-jad-guru that caused the sweat to stand upon the brows of the warriors, though it was cool in the damp corridor and they were twelve to one.

And then the high priest gave the signal—the door shot upward and ten warriors leaped into the chamber with poised clubs. Three of the heavy weapons flew across the room toward a darker shadow that lay in the shadow of the opposite wall, then the flare of the torch in the priest's hand lighted the interior and they saw that the thing at which they had flung their clubs was a pile of skins torn from the windows and that except for themselves the chamber was vacant.

One of them hastened to a window.