Dr. Gregory's Elements of Catoptrics and Dioptrics. Translated Front the Latin Original, with a Large Supplement, by William Browne, M.D. The Second Edition. To which is Added, an Appendix, by J.T. Desaguliers [...] Containing, an Account of the Reflecting Telescopes; and of the Inventors, Improvers, and Imitators of Them, Till They Were Brought to Perfection by John Hadley [...] With Original Letters which Passed Between Sit Isaac Newton and Dr. James Gregory, Relating Thereunto. Now First Published