He had not sufficiently allowed for an old wound which his constitution received whilst battling with dysentery and fever, on his celebrated journey across Africa, and this finally sapped his vital powers, and, through the irritation of exhaustion, insidiously clouded much of his happiness.
Many of his old friends were filled with anxiety when they found that he intended to continue the investigation of the Nile sources, for the letters sent home by Mr. Stanley raised the liveliest apprehensions, which, alas! soon proved themselves well grounded.
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.
I cannot close these remarks without stating how much obliged I am to Mr. James Young, F.R.S., of Kelly, for having ensured the presence of the Doctor's men, Chuma and Susi. Ever ready to serve his old friend Livingstone, he took care that they should be at my elbow so long as I required them to help me amidst the pile of MSS. and maps. Their knowledge of the countries they travelled in is most remarkable, and from constantly aiding their master by putting questions to the natives respecting the course of rivers, &c., I found them actual geographers of no mean attainments. In one instance, when in doubt concerning a particular watershed, to my surprise Susi returned a few hours afterwards with a plan of the whole system of rivers in the region under examination, and I found his sketch tally well with the Doctor's map. Known to me previously for years on the Zambesi and Shiré it was a pleasure to have them with me for four months. Amongst other good services they have aided the artist by reproducing the exact facsimile of the hut in which Dr. Livingstone expired, besides making models of the "kitanda" on which he was carried, and of the village in which his body lay for fourteen days.
I need not add what ready and valuable assistance I have derived from the Doctor's old companion Dr. Kirk wherever I have found it necessary to apply to him; some of the illustrations are more particularly owing to his kindness.
It only remains to say that it has been thought advisable to retain all the strictly scientific matter found in Dr. Livingstone's journals for future publication. When one sees that a register of the daily rainfall was kept throughout, that the temperature was continually recorded, and that barometrical and hypsometrical observations were made with unflagging thoroughness of purpose year in and year out, it is obvious that an accumulated mass of information remains for the meteorologist to deal with separately, which alone must engross many months of labour.
A constant sense of great responsibility has been mine throughout this task, for one cannot doubt that much of the future welfare of distant tribes and races depends upon Livingstone obtaining through these records a distinct hearing for their woes, their misery, and above all for their willingness to welcome men drawn towards them by motives like his.
At the same time memory and affection have not failed to bring back vividly the man, the traveller, and the friend. May that which he has said in his journals suffer neither loss of interest nor depth of meaning at the compiler's hands.