African explorer and sworn enemy of the slave trade, forever immortalized as the recipient of Henry Stanley’s query, “Dr. Livingstone, I presume?” ALS, four pages on two adjoining sheets, 4.5 x 7.25, Royal Geographic Society letterhead, February 3, 1858. Letter to a gentleman. In part, “Upon consulting my memoranda I am sorry to find that I had engaged to meet my old friends Colonel and Mrs. Everest…Truly excuse my forgetting this at the moment in which you gave me the kind invitation for that evening.” Expected mailing folds, light show through from text on reverse and some light soiling and toning, most obvious on the first page, otherwise fine condition. COA John Reznikoff/PSA/DNA and R&R COA.