Take two tracts of equal extent, one of which brings in five and the other ten. If the inhabitants of the first consume four and those of the second nine, the surplus of the first product will be a fifth and that of the second a tenth. The ratio of these two surpluses will then be inverse to that of the products, and the tract which produces only five will give a surplus double that of the tract which produces ten.

But there is no question of a double product, and I think no one would put the fertility of cold countries, as a general rule, on an equality with that of hot ones. Let us, however, suppose this equality to exist: let us, if you will, regard England as on the same level as Sicily, and Poland as Egypt⁠—further south, we shall have Africa and the Indies; further north, nothing at all. To get this equality of product, what a difference there must be in tillage: in Sicily, there is only need to scratch the ground; in England, how men must toil! But, where more hands are needed to get the same product, the superfluity must necessarily be less.