MARTIN (BENJAMIN): New Elements of Optics, London, for the Author, 1759, 8°, FIRST EDITION, title printed in red and black, 9 folding engraved plates (browning), modern brown morocco, ex library -- LACAILLE (NICHOLAS-LOUIS DE): Leçons Élémentatres d'Optique, H. L. Guerin & L. F. Delatour, Paris, 1764, 8°, 12 folding engraved plates, modern brown morocco, gilt, ex library; and 18 others on optics. (20)