Now suppose Tin might be made in _Cornwall_ for four pence the pound, and that the same would yield twelve pence at the nearest part in _France_, I say, that this extraordinary profit ought to be esteemed as a Mine Royal, or _Tresor Trové_, and the Sovereign ought to have his share in it: Which he will have, by imposing so great a duty upon Tin Exported, as on one side may leave a subsistence to the Workmen, (and no more) with a competent profit to the owners of the ground; and on the other side, may leave the price abroad less then that for which Tin may be had from any other place. 5. The same Imposition might also be made on the Tin spent at home, unless it be as impossible so to do, as for the King of _France_ to impose the Gabel upon Salt in the very places where it is made. 6. But it is observed, that such high duties make men endeavour not to enter any such Goods at all, or pay for them, provided the charge of smuckling and bribing, with the hazzard of being seized do not _communibus vicibus_ exceed the Duty. 7. Wherefore the Measures of this Nature are, that it be more easie, safe, and profitable for men to keep the Law, then to break it, unless it be in such cases, where the Magistrate can with certainty execute the Law. As for example, it would be hard to save the Duties upon Horses shipped at a small Port, without adjacent Creeks, and that but some certain two hours every Tide, forasmuch as Horses cannot be disguised, put up in bags or cask, nor shipped without noise and the help of many hands. 8. The Measures of Customs upon imported Commodities are; 1. That all things ready and ripe for Consumption may be made somewhat dearer then the same things grown or made at home; if the same be feasible _cæteris paribus_. 2. That all Superfluities tending to Luxury and sin, might be loaded with so much Impost, as to serve instead of a sumptuary Law to restrain the use of them. But here also care is to be had that it be not better to smuckle then to pay. 9. On the contrary, all things not fully wrought and Manufactured, as raw Hides, Wool, Beaver, Raw-silk, Cotton; as also all Tools and Materials for Manufacture, as also Dying-stuff, &c. ought to be gently dealt with. 10. If to leavy the payment of these Duties could be most exactly performed, Princes might strangely practice one upon another; wherefore since they cannot, the people pay no more then they cannot with greater safety upon the whole matter save, nor observe any more of these Laws, then they cannot elude. 11. The Inconveniences of the way of Customs, are, _viz._ 1. That Duties are laid upon things not yet ripe for use, upon Commodities in _fieri_, and but in the way of their full improvements, which seems the same ill-husbandry, as to make fuel of young Saplings, instead of Dotards and Pollards.