The Last Journals of David Livingstone, in Central Africa.

In the midst of the universal sorrow caused by the intelligence that Dr. Livingstone had lost his life at the furthest point to which he had penetrated in his search for the true sources of the Nile a faint hope was indulged that some of his journals might survive the disaster: this hope I rejoice to say has been realized beyond the most sanguine expectations. (Excerpt from Introduction)