Gregory, David; Browne, W. DR. GREGORY'S ELEMENTS OF CATOPTRICS AND DIOPTRICS. London: for E. Curll, 1715. 8vo. [4], 111, [1], xv, [1], 72, 65-93, [1] pp., + 3 folding plates (complete, this copy with the xv p. introduction bound before the second part.) 19th c. red morocco with title in blind to spine, extremities rubbed, some light scuffs, front board detached. Large stain to title and initial gatherings (dissipating thereafter), some foxing and toning throughout, occasional minor soiling, folding plates linen-backed. ************************* FIRST EDITION IN ENGLISH of Gregory's work which contains the earliest suggestion of the achromatic telescope. Rarely seen at auction. This collection of lectures was first published in Latin in 1695. [ESTC T18625]