The silver and copper tokens which represent gold coin in certain spheres of circulation in the interior of the country, contain a definite quantity of silver and copper prescribed by law, but after they get into circulation, they wear off like gold coins and become even more rapidly mere phantoms, according to the rapidity and steadiness of their circulation. To draw again a line of demonetization beyond which silver and copper tokens would lose their character of coins, they would have to be replaced in turn within certain spheres of their own circulation by some other symbolic money, say iron and lead, and such representation of one kind of symbolic money by another kind would form an endless process. In all countries with a well developed circulation the very requirements of money circulation make it necessary that the character of silver and copper tokens as money be made independent of any loss of weight in those coins. Thus, as it was in the nature of things, it appears that they serve as symbols of gold coin not because they are symbols made of silver or copper, not because they have certain value, but only in so far as they have no value. Relatively worthless things, such as _paper_, can consequently perform the function of symbols of gold money. That subsidiary currency consists of metal tokens, such as silver, copper, etc., is mainly due to the fact that in most countries the less valuable metals such as silver in England, copper in ancient Rome, Sweden, Scotland, etc., had circulated as money before they were degraded by the process of circulation to the rank of small change and replaced by a more precious metal. Besides, it is natural that the money symbol which grows directly out of metallic circulation, should itself be a metal. Just as that portion of gold which would always have to circulate as small change, is replaced by metal tokens; so can the other portion of gold which is constantly absorbed as coin by circulation in the interior of the country and, therefore, must continually circulate, be replaced with worthless tokens. The level below which the mass of circulating coin never sinks is determined in each country by experience. Thus, the originally imperceptible difference between the nominal weight and the metallic weight of a metal coin can grow apace until it reaches the point of absolute separation. The mint name of money parts company with its substance and exists outside of it in worthless slips of paper. Just as the exchange value of commodities is crystallized by their process of exchange into gold money, so is gold money sublimated in its currency into its own symbol first in the form of worn coin, then in the form of subsidiary metal currency, and finally in the form of a worthless token, paper, mere _sign of value_.