LA CAILLE, Nicolas Louis de. Lecons Elementaires d'Optique. Paris: H,L, Guerin & L.F. Delatour, 1764. -- FARRAR, John. An Experimental Treatise on Optics… The Third Part. Cambridge, N.E.: Hilliard and Metcalf, 1826.  FIRST EDITION. -- SCHELLEN, H., Dr. Spectrum Analysis in its Application to Terrestrial Substances. London: Longmans, Green & Co., 1872.  -- BREWSTER, David. Sir. A Treatise on Optics. Philadelphia: Lea and Blanchard, 1839.  FIRST EDITION. -- LANGLEY, S.P. First Memoir. Energy and Vision. N.p.: National Academy of Science, N.d.  Vol. V only.  -- Together, 5 works in 5 volumes, various 4to and 8vo sizes, most in original or contemporary bindings, condition generally good. Complete list available upon request.