_Nov. 28th_—The sun has risen an hour since.—At last the drum was beaten to shew that our Jason, Suliman Kashef, was awake and permitted Selim Capitan to set sail. We had left the two tree-islands, Genna and Sial, on the right, and turned to the left shore. I now found confirmed what I had already remarked—namely, that throughout the left shore, there are not any heights or downs, as on the right. Therefore the stream exercises a far greater dominion over the former, as is plainly seen by the extensive wooded country being inundated. The wide brink of the shore appears principally to lie on the right side of the river, and generally above the level of the left side, which circumstance, perhaps, might be accounted for from the cutting down of the Ethiopian Highlands. We also remarked, from the edge of the right shore being torn away, that a more fertile soil has covered the lower earth, and that the stratum of land is only upon the surface, whereon the downs lay. We found yesterday, near the Island of Tauowàt, a shining black, sandy earth, which Mr. Arnaud called mud: the naturalist, Thibaut, on the contrary, declared it was ferruginous earth; it was, however, nothing else than black volcanic sand. It was mixed with clay, and looked like the laminæ of sifted iron dross; small black crystals formed nearly a third of the component parts, (pyroxene and horne blende, according to appearance). It seemed to have been brought here from the eastern side by a gohr now filled up with mud, or by an old channel of the river, and formed on the shore a layer of about a foot high, above which again was the usual earth strongly alloyed with sand. I had already seen on the right shore volcanic productions. It would therefore be interesting to follow these traces with the gohr into the interior, in order to explain these phenomena in Central Africa.