On the other hand, Lieut. Cameron, whose admirable work has, so to speak, re-constructed the Tanganyika Lake, discovered, on the 3rd of May, 18-74, the Lukuga River, which he supposes to form the outlet. It lies 25 direct miles to the south of the Kasenge Archipelago, numbering seventeen isles, visited by Captain Speke in March, 1857. Dr. Livingstone touched here on July 13, 1869, and heard nothing of the outlet; he describes a current sweeping round Kasenge to south-east or southwards according to the wind, and carrying trees at the rate of a knot an hour. But Mr. Stanley (pp. 400 et passim) agrees with Dr. Krapf, who made a large river issue from "the lake" westwards, and who proposed, by following its course, to reach the Atlantic. The "discoverer of Livingstone" evidently inclines to believe that the Tanganyika drains through the caverns of Kabogo near Uguhha, and he records the information of native travellers that "Kabogo is a great mountain on the other side of the Tanganyika, full of deep holes, into which the water rolls; "moreover, that at the distance of over a hundred miles he himself heard the" sound of the thundering surf which is said to roll into the caves of Kabogo."In his map he ‘cutely avoids inserting anything beyond "Kabogo Mountains, 6,000 to 7,000 feet high." The gallant young naval lieutenant's exploration of the Lukuga has not yet reached us in a satisfactory form. He found the current sluggishly flowing at the rate of 1.2 knots per hour; he followed it for four or five miles, and he was stopped by floating grass and enormous rushes (papyri?). A friendly chief told him that the Lukuga feeds the Lualaba which, beyond Nyangwe (Livingstone's furthest point, in about south latitude 4°) takes the name of Ugarowwa. An Arab had descended this stream fifty- five marches, and reached a place where there were ships and white merchants who traded largely in palm-oil and ivory, both rare on the Congo River. And, unfortunately, "the name (River) Congo was also mentioned," a term utterly unknown except to the few Portuguese-speaking natives. At present, therefore, we must reserve judgment, and the only conclusion to which the unprofessional reader would come is that the weight of authority is in favour of a double issue for the Tanganyika, north and west.