_8th March._ The mountain of Om Hereyzel is of a dark gray granite. We passed it, and then crossed a deep sandy plain entirely barren, direction S. 1° ½ E. The road was strewn with carcases and bones of camels. Few caravans perform the journey without loosing some of their beasts, and this happens more frequently in rocky districts, of difficult passage, or in the neighbourhood of wells, where the already weakened camels surfeit themselves with water, which has the effect of rendering them incapable of resisting fatigue, and the weight of their loads. We passed many low insulated granite hillocks, and granite blocks in the midst of the sands. We halted about mid-day at the entrance of a chain of mountains, running S. E. and N. W., called Djebel Heyzorba (جبل هِزُربه). It is a custom with caravans always to rest during the mid-day hours, when they dine, and sleep afterwards for a couple of hours. At the return from the black countries, when camels are always plentiful, and every body is mounted, the caravan travels in forced marches; but two-thirds of our people were at present on foot. Towards two o’clock we usually set out again, and alighted just before sunset. In the afternoon of this day we passed Heyzorba, and continuing in the same direction as before, halted near some rocks called Beiban (بيبان); a day’s march of about nine hours. I had seen neither trees nor verdure during the whole day. The rocks where we rested, were of granite mixed with large masses of feldspath. _9th March._ Being in want of water, we set out soon after midnight, and reached, after five hours march, the Wady Nakeyb (نقيب), with wells of the same name. The Wady is full of Sant trees, and has near its extremity two deep wells of tolerable water.