The socialist idea of revolution is quite a different one. Insurrection plays no necessary part in it, and no one sees more clearly than the socialist that nothing could prove more disastrous to the democratic cause than to have the present class conflict break into a civil war. If such a war becomes necessary, it will be in spite of the organized socialists, who, in every country of the world, not only seek to avoid, but actually condemn, riotous, tempestuous, and violent measures. Such measures do not fit into their philosophy, which sees, as the cause of our present intolerable social wrongs, not the malevolence of individuals or of classes, but the workings of certain economic laws. One can cut off the head of an individual, but it is not possible to cut off the head of an economic law. From the beginning of the modern socialist movement, this has been perfectly clear to the socialist, whose philosophy has taught him that appeals to violence tend, as Engels has pointed out, to obscure the understanding of the real development of things. The dissensions over the use of force, that have been so continuous and passionate in the labor movement, arise from two diametrically opposed points of view. One is at bottom anarchistic, and looks upon all social evils as the result of individual wrong-doing. The other is at bottom socialistic, and looks upon all social evils as in the main the result of economic and social laws. To those who believe there are good trusts and bad trusts, good capitalists and bad capitalists, and that this is an adequate analysis of our economic ills, there is, of course, after all, nothing left but hatred of individuals and, in the extreme case, the desire to remove those individuals. To those, on the other hand, who see in certain underlying economic forces the source of nearly all of our distressing social evils, individual hatred and malice can make in reality no appeal. This volume, on its historical side, as well as in its survey of the psychology of the various elements in the labor movement, is a contribution to the study of the reactions that affect various minds and temperaments in the face of modern social wrongs. If one's point of view is that of the anarchist, he is led inevitably to make his war upon individuals. The more sensitive and sincere he is, the more bitter and implacable becomes that war. If one's point of view is based on what is now called the economic interpretation of history, one is emancipated, in so far as that is possible for emotional beings, from all hatred of individuals, and one sees before him only the necessity of readjusting the economic basis of our common life in order to achieve a more nearly perfect social order.