Near Wud, or Wolled Hüsseïn, four hours’ east of Halfaia, a natural canal is seen in the rocks, with a steep fall, which even now is active as a Gohr, and might have made an outlet once for the lake on this side. The immediate cause, however, why the blue stream, by Khartùm, presses against its left shore, and flows almost under the houses of Khartùm, lies in the fact, that it has thrown up so much sand within these few years, against its east shore from Hubba to the island of Tuti, that the inhabitants of that great village are forced, when the water has somewhat subsided, to go far over the sand of the heightened bed of the river to the water, and that the inhabitants of the island there wade through the Nile to the right shore, on a sandbank ominously forming itself. If this last current of the blue river shall eventually be dammed up, its mass of water will rush with the strength of a powerful mountain torrent against the mouth of the white stream, and raise it, because its last strength is already expended, even at a moderate height of water, by the projecting rocks and the islands impeding its mouth. Then Khartùm will be lost, and the water will not only regain its former territory below Djami, but the blue stream will also break through above the whole city, as I sufficiently convinced myself a short time ago, at high water, when the city, notwithstanding the miserable Turkish precautions, was saved as if by a miracle, and the blue stream looked into my window, over the narrow dam of earth, which is about three or four feet high. On this occasion, I saw five gazelles at the south-west end of the city, near the hospital, gazing with wonder on the mirror of the water of the wide white stream passing over into its old lake basin, which was driving them towards the city. A stupid Topshi (cannoneer), who was at too great a distance, without further ceremony scared them away immediately by a heavy shot from the powder magazine, whilst I, with my servant, had made a long circuit through the water, in vain. On such an inevitable swelling of the river, which must lead to the destruction of Khartùm, the old double lake that has ebbed away, will come to life for some time, and not only wash away the island of Tuti even to its rocky base, but also the whole margin of the left shore of the united stream up to Kàrreri, which, however, possesses in its rocky mountain, about three hours’ distant from Khartùm, a breakwater reaching from the desert of Baguda.