Marx was a highly-gifted theorist, a master in the realm of thought, but he was quite unpractical in the affairs of everyday life. Had he enjoyed a regular income throughout life, he would probably have attained his end even without the help of Engels. On the other hand, Engels was an exceedingly able, energetic, and highly-cultured man, eminently practical and successful in everything he undertook, but not endowed with that speculative temperament which surmounts intellectual crises and opens out new horizons. But for his intellectual association with Marx he would, in all probability, have remained little more than a Moses Hess. Marx was never a Utopian; the complete saturation of his mind with Hegelian dialectics made him immune to all eternal truths and final social forms. On the contrary, up to 1844 Engels was a Utopian--until Marx explained to him the meaning of political and social conflicts, the basis and the motive force, the statics and dynamics of the history of civilised mankind. Engels' "Criticism of Political Economy" is a very noteworthy performance for a youth of twenty-three engaged in commerce, but it does not rise above the level of the writings of Owen, Fourier, and Proudhon. Engels' contributions to Owen's "New Moral World" (1843-44) are indeed more philosophical than the other articles by Owenites, but as far as matter goes, there is no perceptible difference between them. "The System of Economic Contradictions," on which Proudhon was working when Engels published his "Outlines," is couched, as far as the critical side is concerned, in the same strain of thought as we find in Engels. Both sought to expose the contradictions of the middle-class economic system, not in order to discover in them the source of the progress of society, but to condemn them in the name of justice. Whereas the Owenites considered their system as perfect, Proudhon and Engels had, independently of one another, striven to free themselves from the Socialist Utopias. Proudhon became a peaceful Anarchist and found salvation in the scheme of autonomous economic groups, which should carry on an exchange of labour equivalents with one another. Engels, on the other hand, found a solution of his difficulties in Marx, whom he rewarded with a lifelong friendship and devotion, which proved to be Marx's salvation. Without Engels' literary and financial help, Marx, with his unpractical, helpless, and, at the same time, proud and uncompromising disposition, would most probably have perished in exile. III. CONTROVERSIES WITH BAUER AND RUGE.