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 position.[48] 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 price of an ounce of silver rise above its mint price, when the mint price is merely a reckoning name for aliquot parts of an ounce of silver? The riddle was easily solved. Out of £5,600,000 of silver money which was in circulation at that time, four millions were worn out, clipped and debased. A trial disclosed that £57,000 of silver which were supposed to weigh 220,000 ounces, weighed only 141,000 ounces. The mint went on coining according to the same standard, but light-weighted shillings in actual circulation represented smaller parts of an ounce than their name implied. Hence, a greater quantity of these light-weighted shillings had to be paid in the market for an ounce of silver bullion. When a general recoinage was decided upon in consequence of the derangement that had been produced, LOWNDES, the Secretary of the Treasury, declared that the value of an ounce of silver had risen and therefore it must henceforth be coined into 6s. 3d. instead of into 5s. 2d. as heretofore. His argument practically amounted to the assertion that the rise in the