produce of the land, according to the improvement or neglect of cultivation. The produce of a tax levied in the latter way will vary, not only according to the variations in the produce of the land, but according to both those in the value of the precious metals and those in the quantity of those metals which is at different times contained in coin of the same denomination.

The produce of the former will always bear the same proportion to the value of the real produce of the land. The produce of the latter may, at different times, bear very different proportions to that value.

When, instead either of a certain portion of the produce of land, or of the price of a certain portion, a certain sum of money is to be paid in full compensation for all tax or tithe, the tax becomes, in this case,