Before them now lay a series of sand-hills, intermingled with small clusters of palm-trees. Sometimes the ascent of the sand-hills was most trying for the camels. They extend for five days' march or more, but are nothing in comparison with those in the direction of the Natron Lakes: so one of their guides told them. Often, while crossing this sandy waste, thirsty travellers are deceived by the effects of the curious mirage, when lakes glittering in the sun, with towers, domes, and minarets reflected on their surface, appear before their eyes, to vanish suddenly as they approach. Their camel-drivers had led them them to the left, in order to visit their own village of Ugrefe. It consisted of about thirty light and low dwellings made of clay and palm branches. In an open space near it they encamped beneath two splendid ethel-trees, or tamarisks. At length, on the 6th of May, they reached the plantations surrounding Mourzouk, the capital of Fezzan. The walls are built of a sort of clay glittering with saline incrustations. Going round the whole of the western and northern sides, which have no gateway wide enough for a caravan, they halted on the eastern side of the town, not far from the camp of the pilgrims who were returning from Egypt to Morocco. They were here welcomed by Mr Gagliuffi, a Greek merchant, who received them into his house. The buildings are mostly of one story, with flat roofs and parapets, with interior courts, and broad porticoes supported by pillars in front. The town contains a bazaar and barracks for two thousand Turkish troops. It is a thoroughfare rather than the seat of a commerce. They were here joined by a man of influence named Mahomet Boro, an elderly, respectable-looking personage, wearing a green bournous over white under-clothes. He was to act as mediator between them and the inhabitants of the countries they were to visit. He was now on his homeward journey from a pilgrimage to Mecca. On the 13th of June they left Mourzouk by the eastern gate. Some chiefs from Ghat had arrived, to whose charge Mr Gagliuffi had committed the travellers. At this Mahomet Boro became very indignant, and threatened that he would take care that they should be attacked on the road by his countrymen, nor were these empty threats. It is remarkable that while the Mahommedan religion in general is sinking to corruption along the coast, there are ascetic sects rising up in the interior which unite its last zealous followers by a religious bond. From some of these sects travellers receive much ill-treatment and annoyance. On the 15th of July the doctor determined to visit a remarkable mountain which appeared in the distance. Being unable to obtain any guide, he set off, taking with him as provisions only dried biscuits and dates--the worst possible food in the desert when water is scarce. Making his way over the pebbly ground, he saw a pair of beautiful antelopes, which stopped, gazing at him and wagging their tails.