David Livingstone 1813-1873 Scottish missionary and explorer, discovered Victoria Fails and the source of the Nile, rescued by Henry M. Stanley at Ujiji. A.L.S. 3pp. 8vo.,., London, Apr. 15, 1857, in part: "...I beg to introduce to you the Rev. W. Milne, a missionary from China who wishes to consult some good maps of that country... I have no hesitation in recommending him to apply to you as the fountain of the information He is in search of... ". Light soiling, docketed at top, mounting traces on blank last page. Quite scarce and desirable.