At the peace, many causes converged to make specie rise; the exports of bullion to the East nearly doubled; America grew vigorously, and mining was interrupted by the revolt of the Spanish colonies. Yet favourable as the position of the creditor class might be, it could be improved by legislation, and probably no financial policy has ever been so ably conceived, or so adroitly executed, as that masterpiece of state-craft which gave Lombard Street control of the currency of Great Britain. Under the reign of the producers, values had generally been equalized by cheapening the currency when prices fell. In the fourteenth, fifteenth, and sixteenth centuries, the penny had been systematically degraded, to keep pace with the growing dearth of silver. When the flood of the Peruvian bullion had reached its height in 1561, the currency regained its fineness; but in 1601 the penny lost another half-grain of weight, and, though not again adulterated at the mint, the whole coinage suffered so severely from hard usage that, under the Stuarts, it fell to about two-thirds of its nominal value. A re-coinage took place under William, but then paper came in to give relief, and the money in circulation continued to degenerate, as there was no provision for the withdrawal of light pieces. By 1774, the loss upon even the guinea had become so great that Parliament intervened, and Lord North recommended “that all the deficient gold coin should be called in, and re-coined” and also that the “currency of the gold coin should, in future, be regulated by weight as well as by tale ... and that the several pieces should not be legal tender, if they were diminished, by wearing or otherwise, below a certain weight, to be determined by proclamation.”[347] By such means as this, the integrity of the metallic money was at length secured; but the emission of paper remained unlimited, and in 1797 even the Bank of England suspended cash payments. Then prices advanced as they had never advanced before, and, during the first ten years of the nineteenth century, the commercial adventurers reached their meridian. From 1810 they declined in power; but for several preceding generations they had formed a true aristocracy, shaping the laws and customs of their country. They needed an abundant currency, and they obtained it through the Bank. On their side the directors recognized this duty to be their chief function, and laid it down as a principle that all legitimate commercial paper should always be discounted. If interest rose, the rise proved a dearth of money, and they relieved that dearth with notes.