[OPTICS]. POINCARÉ, Henri. Électricité et optique. Paris, 1890. 2 volumes, 8o. Contemporary morocco-backed boards. -- FARRAR, John. An Experimental Treatise on Optics. Cambridge, 1826. 8o. 19th-century half calf. FIRST EDITION. -- FRESNEL, Augustin. "Mémoire sur la réflexion de la lumière." From: Memoires de l'Académie Royale des Sciences (?). [Paris, 1820]. 4o. Modern thick paper wrappers. -- CONNICK, Charles J. Adventures in Light and Color. New York, 1937. 4o. Original cloth. PRESENTATION COPY, inscribed by Connick to Frances Davis with an autograph letter from Connick to Ms. Davis laid-in. -- HILER, Hilaire. Color Harmony and Pigments. Chicago and New York, 1942. 2o. Original cloth. -- KUNZEK, August. Die Lehre vom Lichte nach dem neuesten Zustande der Wissenschaft. Lemberg, 1836. 8o. 19th-century calf-backed boards. -- MACH, Ernst. Die Prinzipien der physikalischen Optik. Leipzig, 1921. 8o. Original cloth. -- HELMHOLTZ, Hermann von. Vorlesungen uer die elektromagnetische Theorie des Lichts. Hamburg and Leipzig, 1897. 4o. Later cloth. Together 9 volumes, condition varies. (9)