change of matter is but one-sided, and purchase and sale do not coincide. The frontier trade at Kiachta e. g. is both actually and according to treaty, one of barter, in which silver plays only the part of a measure of value. The war of 1857–58 compelled the Chinese to sell without buying. Silver suddenly appeared now as a means of purchase. Out of regard to the letter of the treaty, the Russians made up the French five frank coins into crude silver commodities, which were made to serve as a means of exchange. Silver has always served as a means of purchase between Europe and America on one side and Asia on the other, where it settles down in the form of hoards. Furthermore, the precious metals serve as international means of purchase whenever the ordinary balance of exchange of matter between two nations is suddenly upset, as e. g. when a failure of crops forces one of them to buy on an extraordinary scale. Finally, the precious metals are international means of purchase in the hands of gold and silver producing countries, in which case they directly constitute a product and commodity and not merely a converted form of a commodity. The more the exchange of commodities between different national spheres of circulation is developed, the more important becomes the function of world money to serve as a means of payment for the settlement of international balances.
Like home circulation, international circulation requires a constantly changing quantity of gold and silver. A part of the accumulated hoards serves therefore, in each country as a reserve fund of world money, which now declines, now rises, according to the fluctuations of
