I then passed several detached cones, the steep precipitous sides of which, formed by the breaking away of the strata, looked like so many castles, and traversing Wady Marsíd, reached the camels. They marched to-day at a very good rate, the quickest we had as yet observed in ordinary travelling—namely, half a mile in twelve minutes, making a little less than two and a half miles an hour; but we afterwards found that this had now become our usual rate, whereas before reaching Mizda we had scarcely ever exceeded two miles an hour. The load of the camels, of course, had been heavier in the beginning; but this can hardly be the only reason of the difference. The greater dreariness of the country, and the impulse of our camel-drivers and their beasts to get to their homes, must be taken into account. I must here observe that Overweg and I measured our rate repeatedly, with a chain provided by Government, although it was a very fatiguing labour, and injurious to our dignity in the eyes of our people. Gradually the day grew very uncomfortable, a hot west wind driving the sand into our faces, and totally obscuring the sky. Keeping along the Wady Téroth, sometimes more than a mile wide, we had on our left a broad mount, rising first with a gradual ascent, but in its upper part forming a steep and lofty wall called el Khaddamíyeh. Here, too, according to the information of my faithful Arab, there is said to be a Roman sepulchre. Having passed a small defile, and crossed another valley, we had other Roman ruins on our right, a castle as it seemed, and near it something like a sepulchre; but the sand-storm hardly allowed us to look, still less to go in that direction. At three o’clock in the afternoon we turned off to the west into Wady Tagíje, and encamped near the bed of a torrent eight feet deep, which amply testifies that, at times, a considerable stream is formed here, a fact confirmed by the fresh and luxuriant herbage springing up in many parts of the valley among thick bushes and brushwood. Nor was it quite desolate even now; for the flocks of the Welád Bu-Séf were seen, and their tents were said to be not far off. The upper part of the valley is called el Khúrub. This hot day proved a _dies ater_ to my Arab, who had gone to visit his family. Having brought his old father with him, together with a goat, as a present, and a skin of milk, he unluckily arrived too late in the morning at our last night’s encampment. He then sent his father back with the goat, and began to follow us in the hope of soon overtaking the caravan; but he was obliged to march the whole intensely hot day without water, and he could not drink the milk in the skin, which became quite hot, so that he suffered greatly, and arrived in a very exhausted state.