Pour tudier les lois de l' volution d'une soci t donn e, nous ne pouvons souhaiter de meilleurs mat riaux que les r cits qui sont parvenus jusqu' nous et qui nous d crivent l' tat de cette soci t diff rentes poques. Mais en fait, il sera tr s difficile d'arriver par cette route tablir solidement des lois, c'est- -dire des r gles g n rales de l' volution sociale.

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