"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.
"I do not believe that we shall ever leave the valley alive, but we might;" and he took a third bag for himself.
From the diamond vault the old man led them up a primitive ladder to the floor above, and quickly to the main entrance of the Tower. Only two heavy doors, bolted upon the inside, now lay between them and the terrace, a short distance be-
