an hitherto oppressed class, in other words, a political revolution, is accordingly the essential characteristic of social revolution in this narrow sense, in contrast with social reform. Those who repudiate political revolution as the principal means of social transformation or wish to confine this to such measures as have been granted by the ruling class are social reformers, no matter how much their social ideas may antagonize existing social forms. On the contrary, any one is a revolutionist who seeks to conquer the political power for an hitherto oppressed class, and he does not lose this character if he prepares and hastens this conquest by social reforms wrested from the ruling classes. It is not the striving after social reforms but the explicit confining of one's self to them which distinguishes the social reformer from the social revolutionist. On the other hand, a political revolution can only become a social revolution when it proceeds from an hitherto socially oppressed class. Such a class is compelled to complete its political emancipation by its social emancipation because its previous social position is in irreconcilable antagonism to its political domination. A split in the ranks of the ruling classes, no matter even if it should take on the violent form of civil war, is not a social revolution. In the following pages we shall only discuss social revolution in the sense here defined.