Author's note. I first intended to place the brilliant critique of civilization, scattered through the works of Fourier, by the side of Morgan's and of my own. Unluckily I cannot spare the time. I only wish to remark that Fourier already considers monogamy and private property in land the main characteristics of civilization, and that he calls them a war of the rich against the poor. We also find with him the deep perception that the individual families (les families incoherentes) are the economic units of all faulty societies divided by opposing interests.