“I have never heard of any body of water as large as this in Central South America,” he said.

“Well, I can’t help that,” said the captain logically; “here it is.”

“You say this is the Transient Lake?”

“I do.”

With redoubled interest the aerial voyagers now gazed upon the great body of water below.

None were disposed to dispute the old captain, and Frank, scanning the horizon more intently, saw the faint haze of the shore.

“By Jove!” he exclaimed, “it is a big body of fresh water. However, here we are. Now to recover the treasure. What course shall we pursue, Captain Nicodemus?”

The old captain was much excited.

He walked up and down the deck, rubbing his hands and studying the horizon.

At length he said: