And, nevertheless, no land was signaled, though one of the blacks kept watch constantly in the crossbars. Dick Sand often ascended there himself. There, with a telescope to his eyes, he sought to discover some appearance of mountains. The Andes chain is very high. It was there in the zone of the clouds that he must seek some peak, emerging from the vapors of the horizon. Several times Tom and his companions were deceived by false indications of land. They were only vapors of an odd form, which rose in the background. It happened sometimes that these honest men were obstinate in their belief; but, after a certain time, they were forced to acknowledge that they had been dupes of an optical illusion. The pretended land, moved away, changed form and finished by disappearing completely. On t