New dangers to the banks are also daily disclosed from the extension of that system of extravagant credit of which they are the pillars. Formerly our foreign commerce was principally founded on an exchange of commodities, including the precious metals, and leaving in its transactions but little foreign debt. Such is not now the case. Aided by the facilities afforded by the banks, mere credit has become too commonly the basis of trade. Many of the banks themselves, not content with largely stimulating this system among others, have usurped the business, while they impair the stability, of the mercantile community; they have become borrowers instead of lenders; they establish their agencies abroad; they deal largely in stocks and merchandise; they encourage the issue of State securities until the foreign market is glutted with them; and, unsatisfied with the legitimate use of their own capital and the exercise of their lawful privileges, they raise by large loans additional means for every variety of speculation. The disasters attendant on this deviation from the former course of business in this country are now shared alike by banks and individuals to an extent of which there is perhaps no previous example in the annals of our country. So long as a willingness of the foreign lender and a sufficient export of our productions to meet any necessary partial payments leave the flow of credit undisturbed all appears to be prosperous, but as soon as it is checked by any hesitation abroad or by an inability to make payment there in our productions the evils of the system are disclosed. The paper currency, which might serve for domestic purposes, is useless to pay the debt due in Europe. Gold and silver are therefore drawn in exchange for their notes from the banks. To keep up their supply of coin these institutions are obliged to call upon their own debtors, who pay them principally in their own notes, which are as unavailable to them as they are to the merchants to meet the foreign demand. The calls of the banks, therefore, in such emergencies of necessity exceed that demand, and produce a corresponding curtailment of their accommodations and of the currency at the very moment when the state of trade renders it most inconvenient to be borne. The intensity of this pressure on the community is in proportion to the previous liberality of credit and consequent expansion of the currency. Forced sales of property are made at the time when the means of purchasing are most reduced, and the worst calamities to individuals are only at last arrested by an open violation of their obligations by the banks--a refusal to pay specie for their notes and an imposition upon the community of a fluctuating and depreciated currency.