This, then, was Asïu, a place important for the caravan trade at all times, on account of the routes from Ghadámes and from Tawát joining here, and which did so even as far back as the time when the famous traveller Ebn Batúta returned from his enterprising journey to Sudán homewards by way of Tawát (in the year 1353-4). Desolate and melancholy as it appeared, it was also an important station to us, as we thought that we had now left the most difficult part of the journey behind us. For though I myself had some forebodings of a danger threatening us, we had no idea that the difficulties which we should have to encounter were incomparably greater than those which we had passed through. Mr. Richardson supposed that because we had reached the imaginary frontier of the territories of the Azkár and Kél-owí, we were beyond the reach of any attack from the north. With the utmost obstinacy he reprobated as absurd any supposition that such a frontier might be easily crossed by nomadic roving tribes, asserting that these frontiers in the desert were respected much more scrupulously than any frontier of Austria, notwithstanding the innumerable host of its land-waiters. But he was soon to be undeceived on all the points of his desert diplomacy, at his own expense and that of us all. There was very little attraction for roving about in this broad gravelly plain. Now and then a group of granite blocks interrupted the monotonous level, bordered on the north by a gradually ascending rocky ground, while the southern border rose to a somewhat higher elevation. Desolate as the spot was, and gloomy as were our prospects, the arrival of the Tinýlkum in the course of the afternoon afforded a very cheerful sight, and inspired some confidence, as we felt that our little party had once more resumed its strength. All the people, however, displayed an outward show of tranquillity and security, with the exception of Serki-n-turáwa, who was bustling about in a state of the utmost excitement. Watering the camels and filling the water-skins employed the whole day. _Sunday, August 18._—After a two hours’ march we began to ascend, first gradually, then more steeply, all the rocks hereabouts, consisting of slate, greatly split and rent, and covered with sand. In twenty-five minutes we reached the higher level, which consisted of pebbly ground, with a ridge running, at the distance of about four miles, to the west.