"Bertie, Dias, come up at once, I have an idea!"

They ran to the ladder and climbed up. The excitement with which he spoke showed that the idea was an important one. "Now, Dias," he broke out as they joined him, "we know, don't we, that a part of the Incas' treasure was sent off by boat, and the belief of the Indians was that it was never heard of again."

"That is so, seņor. There was certainly a storm the day after it started, and, as I have told you, it was never heard of again. Had it been, a report of it would surely have come down."

"I believe, Dias, that the boat was dashed to pieces against that line of rocks outside the entrance to the passage. We have reason to believe that the people here were expecting the treasure to arrive, and had the entrance to the cave in readiness to receive it. Certainly no better place could have been chosen for concealment. The boat may have been coming here when the storm broke and drove them towards the shore. They probably attempted to gain the mouth of the cove, but missed it, and were dashed to pieces against the rocks. The Indians on guard here no doubt saw it, and would be sure that the heavy sacks or boxes containing the gold would sink to the bottom. They would lie perfectly secure there, even more secure than if they had been removed and placed in the cave, and could always be recovered when the Spaniards left, so they were content to leave them there. Still, they obeyed the orders they had received to keep watch for ever over the treasure, and to do so knocked that strange hole through the wall and always kept two men on guard there.