GONCOURT (Edmond and Jules). La Révolution dans les mœurs. Paris: E. Dentu, 1854. - In-12, Bradel-style marbled paper boards, smooth spine, untrimmed, cover preserved (later binding). Rare first edition of this almost confidential booklet, in which the two brothers analyze the consequences of the Revolution. A copy by critic and publisher Roger Marx (1859-1913), enriched by a signed autograph letter from Edmond de Goncourt on the title: "to Roger Marx // Edmond de Goncourt." A good copy.