must be a principal source; that at this moment it is an essential one. But we may form very mistaken ideas on this subject, if we do not call to mind in our calculations, that the extent of revenue drawn from foreign commerce must vary with the variations, both in the extent and the kind of imports; and that these variations do not correspond with the progress of population, which must be the general measure of the public wants. As long as agriculture continues the sole field of labor, the importation of manufactures must increase as the consumers multiply. As soon as domestic manufactures are begun by the hands not called for by agriculture, the imported manufactures will decrease as the numbers of people increase. In a more remote stage, the imports may consist in a considerable part of raw materials, which will be wrought into articles for exportation, and will, therefore, require rather the encouragement of bounties, than to be loaded with discouraging duties. A system of government, meant for duration, ought to contemplate these revolutions, and be able to accommodate itself to them.
Some, who have not denied the necessity of the power of taxation, have