ROUSSEAU (Jean-Jacques). Discours sur l'origine et les fondemens de l'inégalité parmi les hommes. Amsterdam: Marc Michel Rey, 1755. - In-8, 189 x 117: frontispiece, LXX pp, (1 f.), 262 pp, (1 f.). Marbled calf, cold fillets framing the boards, ornate smooth spine, red edges (period binding). Tchémerzine, V, p. 532 - Dufour, I, n° 55. First edition, dedicated to the Republic of Geneva, of this famous philosophical essay by Jean-Jacques Rousseau. It is illustrated with a frontispiece engraved by Dominique Sornique after Charles Eisen, a title vignette engraved by Simon Fokke and the arms of the city of Geneva engraved by Fokke after Soubeyran at the head of the epistle. A first-edition copy, including the errata leaf, the author's first name spelled "Jaques" at the end of the epistle, Marc Michel Rey's handwritten correction adding an acute accent to the last letter of the word "conforme" in the antepenultimate line of page 11, and the boxes on pages lxvii-lxviii, 111-112 and 139-140. A fine copy in contemporary binding, very well preserved. Some minor worm damage, notably to one spine and the second cover. Corners slightly dulled.