“No,” was the rejoinder. “It just flashed up for an instant,—like a mirror in the sunlight,—and then vanished.”
“Keep a sharp lookout for its reappearance,” said the professor, with a hint of suppressed excitement in his voice.
“Shall I steer in the direction in which I last saw it?” asked the navigator of the Discoverer.
“Yes. If the old documents are correct we are so near to the location of the lost city now that any clue is worth following.”
“Then you think that the glitter may have come from the city?” asked Nat.
“I cannot say,” rejoined the professor. “It may have been that, or it may have been the sunlight flashing, for an instant, on a hidden lake.”
“But wouldn’t a lake up here come pretty near to proving the existence of the city we are in search of?” asked Nat.
“How do you draw such a conclusion?” inquired the professor, with scientific exactitude.
“I thought you said the old documents said that the lost city was on an island in a lake.”
“Ah, yes; but there may be many lakes of the kind described in these regions,” was the reply. “Any more unusual signs yet, Mr. Tubbs?” he asked presently.