Dublin: J. Potts and D. Chamberlain, 1779. In four volumes. 12mo. Translated by William Kenrick. With an engraved frontispiece in each volume, including a portrait of Rousseau in the first volume. Contemporary full tan calf, gilt-ruled spines, red morocco labels, edges stained green. Covers variously worn, slightly blistered, joints rubbed and starting to crack; early 19th century engraved bookplate of Jonathan Mason, Jr. on front paste-downs, his signature in ink at head of title-pages, text clean and bright.