[DELISLE DE SALES]. De la philosophie de la nature, ou traité de morale pour l'espèce humaine. London, 1777.third edition ("the only one conforming to the original manuscript"), 6 volumes in-8; engraved title pages, portrait of the author by Borel engraved by Duflos, frontispiece and 12 off-text engravings. Bound in contemporary ribboned calf, smooth spine decorated, edges gilt; spine and spinebands slightly cracked in places, rubbed, nevertheless a good copy, very fresh internally.