It would not be possible, in the course of a short introduction, to deal both with the positive content of Rousseau’s thought and with the actual influence he has had on practical affairs. The statesmen of the French Revolution, from Robespierre downwards, were throughout profoundly affected by the study of his works. Though they seem often to have misunderstood him, they had on the whole studied him with the attention he demands. In the nineteenth century, men continued to appeal to Rousseau, without, as a rule, knowing him well or penetrating deeply into his meaning. “The Social Contract ,” says M. Dreyfus-Brisac, “is the book of all books that is most talked of and least read.” But with the great revival of interest in political philosophy there has come a desire for the better understanding of Rousseau’s work. He is again being studied more as a thinker and less as an ally or an opponent; there is more eagerness to sift the true from the false, and to seek in the Social Contract