Isaac Barrow's oPTICAL lectures 1667: Translated by H. C. Fay. Edited by A. G. Bennett and D. F. Edgar. Pp. xxxv + 243. The Worshipful Company of Spectacle Makers, London. 1987. £25.00 (incl. postage & packing by surface mail). Obtainable from publishers, Apothecaries' Hall, Black Friars Lane, London EC4V 6EL