times of the year for different portions of money. To do away with this difficulty he assumes that it does not exist. Moreover, this entire idea of direct contact of commodities and money and direct exchange is a mere abstraction from the movement of simple purchase and sale or the function of money as a means of purchase. Already in the movement of money as a means of payment, commodity and money cease to appear simultaneously.
The commercial crises of the nineteenth century, namely, the great crises of 1825 and 1836, did not result in any new developments in the Ricardian theory of money, but they did furnish new applications for it. They were no longer isolated economic phenomena, such as the depreciation of the precious metals in the sixteenth and seventeenth centuries which interested Hume, or the depreciation of paper money in the eighteenth and early nineteenth centuries which confronted Ricardo; they were the great storms of the world market in which the conflict of all the elements of the capitalist process of production discharge themselves, and whose origin and remedy were sought in the most superficial and abstract