If they were extended to almost all sorts of goods, as at present, public warehouses of sufficient extent could not easily be provided, and goods of a very delicate nature, or of which the preservation required much care and attention, could not safely be trusted by the merchant in any warehouse but his own.

If by such a system of administration smuggling, to any considerable extent, could be prevented even under pretty high duties, and if every duty was occasionally either heightened or lowered according as it was most likely, either the one way or the other, to afford the greatest revenue to the state, taxation being always employed as an instrument of revenue and never of monopoly, it seems not improbable that a revenue at least equal to the present net revenue of the customs might be drawn from duties upon the