As the caravan travelled toward the east, the ground rose by degrees. If I am not mistaken, we passed five oases before we came into the country of Tibboo, a mountainous region between Bornoo and Fezzan, the inhabitants of which suffer considerably from the Kindils, though they are also robbers themselves. The capital of Tibboo is Boolma, built on a high mountain. I was disappointed when I saw the city, for I had heard that it was quite a large place. Laree, the smallest town in Bornoo, is a place of more importance. The people of Tibboo are of dark-brown complexion, and are noted in Soodan for their shrewdness. The day that the caravan happened to be at Boolma, two parties were in a warlike attitude about a fair maid whom each wished their chief to have for a wife. We did not stay long enough to see the issue of the fight, and two days' journey took us out of the kingdom of Tibboo. As soon as the oasis of Tibboo was left, the country became very rocky,--the rock being a kind of black granite; and the Arabs had to make shoes for both their camels and slaves, for the rocks were very sharp, and if this precaution had not been taken, in a few hours their feet would have been so cut that they could not have proceeded farther. Some Arabs would rather lose four or five slaves than a single camel. They rode very seldom. In a journey of ten or twelve weeks I saw Abd-el-Kader ride but once, and the majority never rode at all. In these rocky regions of the desert a great amount of salt is found also,--what is called in our language Kalboo, and I believe, in English, carbonate of soda. Soodan is supplied by the Moors and Kindils with salt from the desert. Sea-shells are also occasionally found in this region. After we left Tibboo fire was never allowed, even in the oases, but I do not know for what reason. The mountainous regions of the desert passed, we came to a more level country, but it was not long before we saw other mountains ahead. As we passed over the last of them, we found them very dangerous from their steepness, and a few camels were lost by falling into the ravines. After passing this dangerous place, a sign of vegetation was seen, oases were more frequent, and at last forests of date-palm, the fruit of which forms the principal food of both the inhabitants of Fezzan and their camels, became abundant. El Kaheni is the first town or human habitation seen after leaving Tibboo. It is a small walled town, like all other places in Fezzan. Here I first saw the curious way in which the Fezzaneers cultivate their land by irrigation. Each farm has a large well, wide at the top and sloping toward the bottom, out of which water is drawn by donkeys, and poured into a trough, from which it runs into small ditches. This process is renewed every few days until the crop no longer needs watering.