The reader must be warned that, however versed in books of African travel he may be, the very novelty of his situation amongst these pages will render him liable perhaps to a danger which a timely word may avert. Truly it may be said he has an _embarras de richesses!_ To follow an explorer who by his individual exertions has filled up a great space in the map of Africa, who has not only been the first to set foot on the shores of vast inland seas, but who, with the simple appliances of his bodily stature for a sounding pole and his stalwart stride for a measuring tape, lays down new rivers by the hundreds, is a task calculated to stagger him. It may be provoking to find Livingstone busily engaged in bargaining for a canoe upon the shores of Bangweolo, much as he would have secured a boat on his own native Clyde; but it was not in his nature to be subject to those paroxysms in which travellers too often indite their discoveries and descriptions. At the same time these journals will be found to contain innumerable notes on the habits of animals, birds, and fishes, many of them probably new species, and on phenomena in every direction which the keen eye searched out as the great traveller moved amongst some of the grandest scenes of this beautiful world: it may be doubted if ever eye so keen was backed by so much perseverance to shield it from a mere superficial habit of noticing. Let his adventures speak for themselves. Amongst the greatest facts recorded here the Geographer will perceive that the Doctor has placed it beyond doubt that Lake Nyassa belongs to a totally distinct system of waters to that which holds Lake Tanganyika, and the rivers running north and west. He was too sagacious to venture the surmise that Tanganyika has a subterranean outlet without having duly weighed the probabilities in the scale with his elaborate observations: the idea gathers force when we remember that in the case of limestone cliffs, water so often succeeds in breaking bounds by boring through the solid rock. No more interesting problem is left to solve, and we shall yet learn whether, through the caverns of Western Kabogo, this Lake adds its waters to the vast northerly flow of rivers we now read of for the first time, and which are undoubtedly amongst the largest in the world.