The abstract principles on which the doctrines of free trade are founded, are these; and we put it to the warmest advocates of those principles, whether they are not fairly stated. All nations were not intended by nature, nor are they fitted by their physical circumstances, to excel in the same branches of industry; and it is the variety in the production which they severally can bring to maturity, which at once imposes the necessity for, and occasions the profit of, commercial intercourse. Nothing, therefore, can be so unwise as to attempt, either by arbitrary regulations, to create a branch of industry in a country for which it is not intended by nature, or to retain it in that branch where it is created by forced prohibitions. Banish all restrictions, therefore, from commerce; let every nation apply itself to that particular branch of industry for which it is adapted by nature, and receive in exchange the produce of other countries, raised, in like manner, in conformity with their natural capabilities. Then will the industry of each people be turned into the channel most advantageous and lucrative to itself; each will enjoy the immense advantage of purchasing the commodities it requires at the cheapest possible rate; hopeless or absurd hot-bed attempts to force extraneous industry will cease; and, in the mutual interchange of the surplus produce of each, the foundation will be laid of an advantageous and durable commercial intercourse. England, on this principle, should not attempt to raise wine, nor France iron or cotton goods; but the calicoes and hardware of Great Britain should be exchanged for the wines and fruits of France: both nations will thus be enriched, and a vast commercial traffic grow up, which, being founded on mutual interest and attended with mutual advantage, may be expected to be durable, and to extinguish, in the end, the rivalry of their respective people, or the jealousy of their several governments. Such is the theory of free trade; and it may be admitted it wears at first sight a seducing and agreeable aspect. Let us now enquire how far experience, the great test of truth, has verified its doctrines, or demonstrated its practicability. To illustrate this matter, we shall have recourse to no mean or doubtful authority; we shall have recourse to the statement of an enlightened but candid contemporary, whose advocating of a moderate system of free trade has excited no small anxiety in the British empire; and which report, from the information and ability it displays, has assigned to the present accomplished head of the Board of Trade. The efforts made in Great Britain to introduce a general system of free trade, especially within the last three years, are thus enumerated in the _Foreign and Colonial Review_. "England, without gaining or asking a single boon from any foreign country, has-- "1. Reduced by about one-half the duties upon foreign corn. "2. By nearly the same amount, the duties on foreign timber.