By the same statute a great number of foreign drugs for dyers' use are exempted from all duties upon importation. Each of them, however, is afterward subjected to a certain duty, not, indeed, a very heavy one, upon exportation. Our dyers, it seems, while they thought it for their interest to encourage the importation of those drugs, by an exemption from all duties, thought it likewise for their own interest to throw some small discouragement upon their exportation. The avidity, however, which suggested this notable piece of mercantile ingenuity, most probably disappointed itself of its object. It necessarily taught the importers to be more careful than they might otherwise have been, that their importation should not exceed what was necessary for the supply of the home market. The home market was at all times likely to be more scantily supplied; the commodities were at all times likely to be somewhat dearer there than they would have been, had the exportation been rendered as free as the importation.
By the above-mentioned statute, gum-senega or gum-arabic, being among the enumerated dyeing drugs, might be imported duty free. They were subjected, indeed, to a small poundage duty, amounting only to threepence in the hundredweight upon their re-exportation. France enjoyed, at that time, an exclusive trade to the country most productive of those drugs, that which lies in the neighborhood of the Senegal; and the British market could not be easily supplied by the immediate importation of them from the place of growth. By the 25th of George II., therefore, gum-senega was allowed to be imported (contrary to the general dispositions of the act of navigation), from any part of Europe. As the law, however, did not mean to encourage this species of trade, so contrary to the general
