Autograph letter signed (‘Charles Theo. Gaudin’) to an unknown Italian correspondent, in French, saying he has just arrived in Milan on his journey to Switzerland with Madame de Rumine and her son Gabriel and mentioning a conversation they had in Florence. In French. 2 pp. 8 x 5 inches, fine. Milan, undated. Charles-Théophile Gaudin (1822-1866), Swiss palaeontologist known for his research in the field of palaeobotany. He studied theology in Lausanne, afterwards spending several years in England as tutor to the family of Lord Ashley. He then returned to Switzerland, where he concentrated on palaeontological studies. In 1854 he began work as a tutor to Gabriel de Rumine, the son of Catherine de Rumine, with whom he founded the Musée industriel de Lausanne in 1862.