The Wealth of Nations by Part 5 Chapter 2 Page 207

been supposed by many people, might very easily be brought about.

The importer of commodities liable to any duties of customs, it has been said, might as his option be allowed either to carry them to his own private warehouse, or to lodge them in a warehouse provided either at his own expense or at that of the public, but under the key of the custom-house officer, and never to be opened but in his presence.

If the merchant carried them to his own private warehouse, the duties to be immediately paid, and never afterwards to be drawn back, and that warehouse to be at all times subject to the visit and examination of the custom-house officer, in order to ascertain how far the quantity contained in it corresponded with that for which the duty had been paid. If he carried them to the public