ROUSSEAU, Jean Jacques (1712-1778). Discours sur l'origine et les fondemens de l'inegalité parmi les hommes. Amsterdam: chez Marc Michel Rey, 1755. Engraved frontispiece by D. Sornique after Eisen, engraved title-vignette after S. Fokke, engraved vignette (arms of Geneva) by Fokke on *2r, with the three cancelled leaves and the acute accent added by Rey, title printed in red and black, with the final errata leaf. [Bound with:] Lettre de M.D.B.*** a Madame *** au sujet du Discours sur l'origine...de l'inégalité parmi les hommes, par Jean Jacques Rousseau. Ibidem, 1755. 2 works in one volume, 8° (197 x 119mm.) Contemporary mottled calf, gilt spine (rather worn). FIRST EDITION of Rousseau's Origin of Inequality, written during his rise to fame. 'Finally, for this was an important year with him, the Dijon academy, which had founded his fame, announced the subject of "The Origin of Inequality", on which he wrote a discourse which was unsuccessful, but at least equal to the former in merit', (Encyclopaedia Britannica). Dufour 55 (first work).