Fr. Roger Bacon: Opus Tertium, Opus Minus, Compendium Philosophiae (1859) is a book written by John Sherren Brewer that features the works of Roger Bacon, a 13th-century English philosopher and Franciscan friar. The book includes three of Bacon's major works: Opus Tertium, Opus Minus, and Compendium Philosophiae. Opus Tertium is Bacon's most famous work, which he wrote in 1267. It is a comprehensive treatise on natural philosophy, covering topics...