I have only to answer to this, that Khartùm already lies considerably lower than our present course; that further up the country, on the left shore, considerable mountains rise towards the W.—for example—those of Kordofàn, which, now at least, do not allow the river to discharge itself from hence into the Libyan deserts. Indeed, many contests and physical revolutions must have occurred before the White Stream crept into its present channel, where it is nearly stagnant, and which seems scarcely natural in so long a tract. _Nov. 30th._—Towards morning we set out with a tolerably good N.E. wind, and soon after sun-rise made four miles[5] an hour; at six o’clock it was 18, and at noon 28 degrees Reaumur. We sailed till eight o’clock, S.W., and passed by a small wooded island, the grassy foreground of which was picturesquely garnished with trees. The prospect on the stream was shut out from us by four islands, through which we passed towards the south, and left them right and left at our side. Among the trees standing in the water were large, white aquatic flowers, visible even at a distance, which glistened forth magnificently from a floating world of flowers, in the moist splendour of the morning. It was the double white Lotus. The sunt-trees stand in full bloom, and appear, in comparison with the others, to have been of later growth, as they stand here still deep in the water. We approached near the largest of the before-named islands, which is an hour long, and I remarked that it is elevated towards the interior, in the form of a shield; this is not the case with the others. They are long and flat islands, pieces separated from the shore, existing only as long as the wood on their level backs which restrains the pressure of the waves. They are a proof of a yet uncultivated course of the stream, in a deserted freshwater basin. The water still struggles here against the aspiring vegetation. The trees are of slender growth, but of young and fresh appearance; the moist element promotes a rich, exuberant growth, and just as speedy a death, with the usual tropical power of regeneration. In the interior, however, much stronger trees are found. When we sail towards the south, we leave this island on the left, and turn again south-west, where the head (Ras) of a long island ends, and other islands, to the number of seven, shutting out the back-ground from our view, spread here in such a manner, that the stream appears like a regular Island-sound, which can be better seen than described.