mentary form of a commodity, exchange value assumes the elementary form of money and in all phases of the process of production wealth reassumes for a moment the universal elementary commodity form. Even at the most advanced stage of bourgeois economy, the specific functions of gold and silver to serve as money, in contradistinction to their function of mediums of circulation—a function which distinguishes them from all other commodities—is not done away with, but only limited, hence the monetary and mercantile system retains its right of citizenship. The Catholic fact that gold and silver are contrasted with other profane commodities as the direct incarnation of social labor, that is as the expression of abstract wealth, naturally offends the Protestant point d'honneur of bourgeois economy, and out of fear of the prejudices of the monetary system it had lost for a long time its grasp of the phenomena of money circulation, as will be shown presently.
It was quite natural that, contrary to the monetary and mercantile system which knew money only in its form of a crystallized product of circulation, classical political economy should have conceived money first of all in its fluent form of exchange value arising and disappearing within the process of the metamorphosis of commodities. And since the circulation of commodities is regarded exclusively in the form of C—M—C and the latter in its turn, exclusively in its aspect of a dynamic unity of sale and purchase, money comes to be regarded in its capacity of a medium of circulation as opposed to its capacity of money. And when that medium of circulation is isolated in its function of coin, it turns, as
