Here and there in the desert are oases containing towns of greater or less importance, at which the caravans halt. Kishi is one of the most frequented of these places, and there the money for the right of crossing the desert is paid. The Sultan of Kishi, the ruler of a good many of these petty principalities, and who takes the title of Commander of the Faithful, was remarkable for a complete disregard of cleanliness, a peculiarity in which, according to Denham, his court fully equalled him. This sultan paid Boo-Khaloum a visit in his tent, accompanied by half a dozen Tibboos, some of whom were positively hideous. Their teeth were of a dark yellow colour, the result of chewing tobacco, of which they are so fond that they use it as snuff as well as to chew. Their noses looked like little round bits of flesh stuck on to their faces with nostrils so wide that they could push their fingers right up them. Denham's watch, compass, and musical snuffbox astonished them not a little. He defines these people as brutes with human faces. A little further on the travellers reached the town of Kirby, situated in a wady near a low range of hills of which the highest are not more than 400 feet above the sea level, and between two salt lakes, produced by the excavations made for building. From the centre of these lakes rise islets consisting of masses of muriate and carbonate of soda. The salt produced by these wadys, or depressions of the soil, form an important article of commerce with Bornou and the whole of the Soudan. It would be impossible to imagine a more wretched place than Kirby. Its houses are empty, containing not so much as a mat. How could it be otherwise with a place liable to incessant raids from the Tuaricks? The caravan now crossed the Tibboo country, inhabited by a peaceful, hospitable people to whom, as keepers of the wells and reservoirs of the desert, the leaders of caravans pay passage-money. The Tibboos are a strong, active race, and when mounted on their nimble steeds they display marvellous skill in throwing the lance, which the most vigorous of their warriors can hurl to a distance of 145 yards. Bilma is their chief city, and the residence of their sultan.