French-American traveler and anthropologist (1835–1903) best known as the first modern outsider to confirm the existence of gorillas and the Pygmy people of central Africa. ALS signed “P. B. Du Chaillu,” one page, 7 x 9.5, November 25, 1870. Letter to a gentleman. In part: “I can assure you that I have had a most delightful visit…and shall not forget soon the kindness of your family.” In fine condition. RR Auction COA.