and therefore both legal tender, so that every one has the option of paying in either metal, the metal that rises in value is at a premium, and, like every other commodity, measures its price in the over-estimated metal which alone serves in reality as the standard of value. The result of all experience and history with regard to this question is simply that, where two commodities perform by law the functions of a measure of value, in practice one alone maintains that
B. THEORIES OF THE UNIT OF MEASURE OF MONEY.
The circumstance that commodities are converted into gold only in ideas as prices and that gold is therefore turned into money only in idea, gave rise to the theory of the ideal unit of measure of money. Since, in the determination of prices, gold and silver serve only ideally as money of account, it was asserted that the names pound, shilling, pence, thaler, franc, etc., instead of denoting certain weights of gold and silver or labor incorporated in some way, stood rather for ideal atoms of value. Thus, if, e. g., the value of an ounce of silver should rise it would contain more such atoms and would therefore have to be estimated and coined in a greater number of shillings. This doctrine, revived again during the last commercial crisis in England and even voiced in Parliament in two separate reports attached to the report of the select Committee on the Bank Acts sitting in July, 1858, dates from the end of the seventeenth century.
At the time of the accession of William III., the English mint-price of an ounce of silver was 5s. 2d., or 1-62 of an ounce of silver was equal to a penny; 12 of these pence were called a shilling. According to that standard, a piece of silver weighing, say, 6 ounces, would be coined into thirty-one coins, each called a shilling. But the market price of an ounce of silver rose above its mint price, from 5s. 2d. to 6s. 3d., or, in order to buy an ounce of silver bullion 6s. 3d. had to be paid. How could the market