The mechanic industry of these societies combine in the same producer, manual labor and intellectual labor; it was for example the same cabinetmaker who designed and executed the piece of furniture, who bought its first material and who even undertook its sale. Capitalist production has divorced two functions which once were indissolubly united; on the one side it puts the manual workers, who become more and more servants of the machine, and on the other the intellectual workers, engineers, chemists, managers, etc. But these two categories of workers, however different and contrary they may be in their education and habits, are welded together, to the point that a capitalist industry can not be carried on without manual laborers any more than without intellectual wage-workers. United in production, united under the yoke of capitalist exploitation, united they should be also in revolt against the common enemy. The intellectuals, if they understood their own real interests would come in crowds to socialism, not through philanthropy, not through pity for the miseries of the workers, not through affectation and snobbery, but to save themselves, to assure the future welfare of their wives and children, to fulfill their duty to their class. They ought to be ashamed of being left behind in the social battle by their comrades in the manual category. They have many things to teach them, but they have still much to learn from them; the workingmen have a practical sense superior to theirs, and have given proof of an instinctive intuition of the communist tendencies of modern capitalism which is lacking to the intellectuals, who have only been able by a conscious mental effort to arrive at this conception. If only they had understood their own interests, they would long since have turned against the capitalist class the education which it has generously distributed in order better to exploit them; they would have utilized their intellectual capacities, which are enriching their masters, as so many improved weapons to fight capitalism and to conquer the freedom of their class, the wage-working class.