of the precious metals necessary for repairing the wear and tear, and other waste, of a metallic currency.
The substitution, therefore, of paper for the precious metals, should always be carried as far as is consistent with safety; no greater amount of metallic currency being retained than is necessary to maintain, both in fact and in public belief, the convertibility of the paper. A country with the extensive commercial relations of England is liable to be suddenly called upon for large foreign payments, sometimes in loans, or other investments of capital abroad, sometimes as the price of some unusual importation of goods, the most frequent case being that of large importations of food consequent on a bad harvest. To meet such demands it is necessary that there should be, either in circulation or in the coffers of the banks, coin or bullion to a very considerable amount, and that this, when drawn out by any emergency, should be allowed to return after the emergency is past. But since gold wanted for exportation is almost invariably drawn from the reserves of the banks, and is never likely to be taken directly from the circulation while the banks remain solvent, the only advantage which can be obtained from retaining partially a metallic currency for daily purposes is, that the banks may occasionally replenish their reserves from it.
§ 3.When metallic money had been entirely superseded and expelled from circulation, by the substitution of an equal amount of bank notes, any attempt to keep a still further quantity of paper in circulation must, if the notes are convertible, be a complete failure. The new issue would again set in motion the same train of consequences by which the gold coin had already been expelled. The metals would, as before, be required for exportation, and would be for that purpose demanded from the banks, to the full extent of the superfluous notes; which thus could not possibly be retained in circulation. If, indeed, the notes were inconvertible, there
