The Wealth of Nations by Part 5 Chapter 2 Page 261

secondly, the provinces subject to the tariff of 1667, which are called the provinces reckoned foreign, and under which are comprehended the greater part of the frontier provinces; and, thirdly, those provinces which are said to be treated as foreign, or which, because they are allowed a free commerce with foreign countries, are in their commerce with other provinces of France subjected to the same duties as other foreign countries.

These are Alsace, the three bishoprics of Metz, Toul, and Verdun, and the three cities of Dunkirk, Bayonne, and Marseilles. Both in the provinces of the five great farms (called so on account of an ancient division of the duties of customs into five great branches, each of which was originally the subject of a particular farm, though they are now all united into one), and in those