the French Revolution that socialism presents a certain unity of process, which appears more evident since 1830 with the definite political supremacy of the capitalist class in France and England and which finally becomes obvious, we might say even palpable, since the rise of the International. Upon this road the Manifesto stands like a colossal guide post bearing a double inscription: on one side the first sketch of the new doctrine which has now made the circle of the world; on the other, the definition of its relations to the forms which it excludes, without giving, however, any historic account of them. The vital part, the essence, the distinctive character of this work are all contained in the new conception of history which permeates it and which in it is partially explained and developed. By the aid of this conception communism, ceasing to be a hope, an aspiration, a remembrance, a conjecture, an expedient, found for the first time its adequate expression in the realization of its very necessity, that is to say, in the realization that it is the outcome and the solution of the struggles of existing classes. These struggles have varied according to times and places and out of them history has developed; but, they are all reduced in our days to the single struggle between the capitalist bourgeoisie and the workingmen inevitably forced into the ranks of the proletariat. The Manifesto gives the genesis of this struggle; it details its evolutionary rhythm, and predicts its final result. In that conception of history is embodied the whole doctrine of scientific communism. From that moment the theoretical adversaries of socialism have no longer had to discuss the abstract possibility of the democratic socialization of the means of production;[2] as if it were possible in this question to rest their judgment upon inductions based upon the general and common aptitudes of what they characterize as human nature. Thenceforth, the question was to recognize, or not to recognize, in the course of human events the necessity which stands over and above our sympathy and our subjective assent. Is or is not society in the countries most advanced in civilization organized in such a way that it will pass into communism by the laws inherent in its own future, once conceding its present economic structure and the friction which it necessarily produces within itself, and which will end by breaking and dissolving it? That is the subject of all discussion since the appearance of this theory and thence follows also the rule of conduct which imposes itself upon the action of the socialist parties whether they be composed of proletarians alone or whether they have in their ranks men who have come out from the other classes and who join as volunteers the army of the proletariat.