_24th._--Emjessen. Arrived at these wells about 10 A.M. Earlier we had passed a place where they were trying to get water. Emjessen is a vast salt plain, which is covered over in different parts with a coating of salt, hard enough and thick enough to furnish materials for building. And here they were building a _burge_, "tower," or _kasbah_, "castle," or _fonduk_, "caravanserai," (all which names people called it,) with a large wall round the principal wells, the materials of which were red earth and lumps of salt, some of which appeared as hard as the soft Malta stone. The water is, of course, brackish, but nevertheless the camels drank it with eagerness. I was staring at the eagerness with which the camels were drinking, when the Commandant said, "_Enhār săkoun, Yâkob_," (a hot day, James,) "do the camels in your country drink water in that way?" Hereat a merchant interposed, and instructed the Rais that the English had no camels, but lived on boats in the water. This is a very commonly spread opinion respecting the English in The Desert. But Caillié says of the Foulahs near Kankan, and other tribes: "The prevailing idea of the people in the interior of Soudan is, that we inhabit little islands in the middle of the ocean, and that the Europeans wish to get possession of their country, which is the most beautiful in the world." Mohammed would not allow his camels to drink here, and said the water was bad. Emjessen is situate about ten hours from Ghadames, say, a short day's journey. The Sahara all around now showed still more marked features of sterility, of unconquerable barrenness. Here too, for the first time, I saw boundless ridges and groups of sand stretching far away to the south-west, but they were low squatting heaps. Some sand-hills we had crossed for an hour or two. Mohammed called them _wâr_, and asked me to descend to save his camel's legs, I thought my legs less practised in The Desert than the camel's, and kept my place. Here were spread about, between the sand-hills and low black stony ridges, plains of salt and chalk. My first impression was, that the sea had once covered these regions. Our route was still south-west, and south, and the prevailing wind _ghiblee_, or from about the same quarter.