A lengthy Autograph Letter Signed, to monsieur Boutigny [Pierre Hippolyte Boutigny, professor of chemistry], discussing his travels and researches. In French. 3 pp. 10 x 8 inches, one line stained, address panel holed, in clean legible condition, tipped on to an old album leaf. Rouen, 4 May 1823. Auguste Le Prévost (1787-1859), geologist, archaeologist, philologist and historian, specialist in Norman history and architecture.