Observations on the duties and offices of a physician; and on the method of prosecuting enquiries in philosophy.

"The first philosophical, secular medical ethics in the English language" (Lawrence, Paul. "(John Gregory." Oxford Dictionary of National Biography.). "Gregory divided the practice of medicine into four parts, or branches: 'the art of preserving health, of prolonging life, of curing diseases, and making death easy' " (Vanderpool, Palliative care [2015] 19). Digital facsimile from Google Books at this link.