Autograph Letter Signed [to Pierre Hippolyte Boutigny, professor of chemistry], about the validity of Boutigny’s experiments and the correct procedure for proceeding to publication with official approval. In French. 2 pp. 8 x 5 inches, in fine condition. Paris, 10 January 1861. Hervé Auguste Étienne Albans Faye (1814 – 1902), French astronomer, studied comets, and discovered the periodic comet 4P/Faye on 22 November 1843. His discovery of “Faye’s Comet” attracted worldwide attention, and won him the 1844 Lalande Prize and a membership in the French Academy of Sciences. His work covered the entire field of astronomical investigation. It comprised the determination of comet periods, the measurement of parallaxes, and the study of stellar and planetary movements. He also studied the physics of the sun.