revenue of the proprietor, in the other that of the sovereign.

In circumstances, therefore, somewhat different from those which have actually taken place, this constancy of valuation might have been a very great inconveniency, either to the contributors, or to the commonwealth. In the course of ages such circumstances, however, must, at some time or other, happen. But though empires, like all the other works of men, have all hitherto proved mortal, yet every empire aims at immortality. Every constitution, therefore, which it is meant should be as permanent as the empire itself, ought to be convenient, not in certain circumstances only, but in all circumstances; or ought to be suited, not to those circumstances which are transitory, occasional, or accidental, but to those which are necessary and therefore always the same.