Before long the moon came out in full splendor, flooding the vast expanse with enchanting light and creating a scene beautiful beyond description. The sand looked white all about, broken only by an occasional ripple caused by the wind. The brilliant moon was surrounded by a large white circle, which seemed to throw silver darts on the dunes. In the distance were groups of luminous clouds, whose ragged edges were transparent. It was a wonderful sight, and the explorers sat for some time as though transfixed. "Never saw anything like it in my life!" exclaimed Mr. Holton, his breath almost taken away by the magnificent spectacle. "Wonder if we're dreaming?" mused Joe, also fascinated. Fekmah and Tishmak had been out to witness such a spectacle before, but seemed to think no less of it. "I guess here's a case where familiarity doesn't breed contempt," laughed Mr. Lewis, his eyes on the Arabs. Bob got out the movie camera, intent upon taking several scenes that would be "really different." "Moonlight always makes a good impression on a motion-picture audience," remarked Joe. "And away out here on the Sahara--well, it'll seem wonderful!" Tishmak made signs that they move on, and the others were glad to do so. Since there was so much light, it would be easy to find their way. They were now in a region of high sand hills, with still no rocks other than the small bright-colored pebbles that were scattered about. Vegetation began to be more numerous in the form of _had_, _drinn_, and other plants, which were occasionally eaten by the dromedaries. "I wonder if Fekmah is sure he's headed right?" said Bob, as he and his friend again took their places at the end of the caravan. "He doesn't seem to be having any trouble yet," was the reply. "You remember he made another map from memory after the first one was stolen. Chances are he knows where he's going." "If he doesn't, we probably won't find the hidden riches," was Bob's return. They trudged on, up and down the sand hills, until about ten o'clock. Then Tishmak called a halt. "We camp here for night," announced Fekmah, after a short conference with the guide. "It not wise to go any farther tonight. We get a sleep; then start on in morning." "I was just thinking it's about time," laughed Dr. Kirshner. Tishmak had purposely picked out a deep gulch between the mounds as the stopping place. This would be a fair precaution against the nomad bandits who were reputed to be in this region. "Takes a guide to know what's best," remarked Bob, observing the high walls of sand all about them. "The country in this vicinity is so rough that a caravan wouldn't come anywhere near it, especially later on, when it will be pitch dark." The explorers dismounted and got out the tent. The poles were put up, and in a short time everything was in readiness for the night's sleep.