“I can stand it no longer,” cried La. “I am suffocating and I am half-blinded.” “Very well,” said the old man; “I doubt if they can see us now. It is pretty thick. Come, follow me;” and he led the way up the steps of the dais and through an aperture behind the thrones—a small opening hidden by hangings. The old man went first, and then La, followed by Tarzan and Jad-bal-ja, who had about reached the limit of his endurance and patience, so that it had been with difficulty that Tarzan had restrained him, and who now was voicing his anger in deep growls which might have apprised the Bolgani of their avenue of escape. Behind Tarzan and the lion crowded the coughing Gomangani; but because Jad-bal-ja was just in front of them they did not crowd as closely upon the party ahead of them as they probably would have done otherwise. The aperture opened into a dark corridor which led down a flight of rough steps to a lower level, and then straight through utter darkness for the rather considerable distance which separated the Tower of Diamonds from the Tower of the Emperors. So great was their relief at escaping the dense smoke of the throne room that none of the party minded the darkness of the corridor, but followed patiently the lead of the old man who had explained that the first stairs down which they had passed were the only obstacles to be encountered in the tunnel. At the corridor’s end the old man halted before a heavy door, which after considerable difficulty he managed to open. “Wait a moment,” he said, “until I find a cresset and make a light.” They heard him moving about beyond the doorway for a moment and then a dim light flared, and presently the wick in a cresset flickered. In the dim rays Tarzan saw before them a large rectangular chamber, the great size of which was only partially suggested in the wavering light of the cresset. “Get them all in,” said the old man, “and close the door;” and when that had been done he called to Tarzan. “Come!” he said. “Before we leave this chamber I want to show you such a sight as no other human eyes have ever rested upon.” He led him to the far side of the chamber where, in the light of the cresset, Tarzan saw tier after tier of shelves, upon which were stacked small sacks made of skins. The old man set the cresset upon one of the shelves and taking a sack opened it and spilled a portion of the contents into the palm of his hand. “Diamonds,” he said. “Each of these packages weighs five pounds and each contains diamonds. They have been accumulating them for countless ages, for they mine far more than they can use themselves. In their legends is the belief that some day the Atlantians will return and they can sell the diamonds to them. And so they continue to mine them and store them as though there was a constant and ready market for them. Here, take one of the bags with you,” he said. He handed one to Tarzan and another to La.