The essential condition for the existence, and for the sway of the bourgeois class, is the formation and augmentation of capital; the condition for capital is wage-labor. Wage-labor rests exclusively on competition between the laborers. The advance of industry, whose involuntary promoter is the bourgeoisie, replaces the isolation of the laborers, due to competition, by their revolutionary combination, due to association. The development of modern industry, therefore, cuts from under its feet the very foundation on which the bourgeoisie produces and appropriates products. What the bourgeoisie therefore produces, above all, are its own grave diggers. Its fall and the victory of the proletariat are equally inevitable. (a) By bourgeoisie is meant the class of modern Capitalists, owners of the means of social production and employers of wage-labor. By proletariat, the class of modern wage-laborers who, having no means of production of their own, are reduced to selling their labor-power in order to live. (b) That is, all written history. In 1847, the pre-history of society, the social organization existing previous to recorded history, was all but unknown. Since then, Haxthausen discovered common ownership of land in Russia, Maurer proved it to be the social foundation from which all Teutonic races started in history, and by and by village communities were found to be, or to have been the primitive form of society everywhere from India to Ireland. The inner organization of this primitive Communistic society was laid bare, in its typical form, by Morgan's crowning discovery of the true nature of the Gens and its relation to the Tribe. With the dissolution of these primaeval communities society begins to be differentiated into separate and finally antagonistic classes. I have attempted to retrace this process of dissolution in: "Der Ursprung der Familie, des Privateigenthums und des Staats," 2nd edit., Stuttgart, 1886. (c) Guildmaster, that is a full member of a guild, a master within, not a head of a guild. (d) "Commune" was the name taken, in France, by the nascent towns even before they had conquered from their feudal lords and masters, local self-government and political rights as the "Third Estate." Generally speaking, for the economical development of the bourgeoisie, England is here taken as the typical country; for its political development, France. II. PROLETARIANS AND COMMUNISTS. In what relation do the Communists stand to the proletarians as a whole? The Communists do not form a separate party opposed to other working class parties. They have no interests separate and apart from those of the proletariat as a whole. They do not set up any sectarian principles of their own by which to shape and mould the proletarian movement.