Every plan proposed for this purpose, which does not proceed upon an exact recapitulation of the inhabitants of a country, parish by parish, will prove nothing more than an expedient for walking in the dark. Among such recapitulations or lists I would recommend, as an improvement upon those I have seen in the Marechal de Vauban’s excellent performance above cited, and in the states of his Prussian Majesty, or elsewhere, to have one made out, classing all the inhabitants, not only by the trades they exercise, but by those of their fathers, with a view to distinguish those classes which multiply, from those which only procreate. I should be glad also to see bills of mortality made out for every class, principally to compare the births and deaths of the children in them. Let me take an example. Suppose then, that I have before me a general recapitulation of all the inhabitants of a country, parish by parish, where they may appear distributed under the respective denominations of their fathers’ employment. I shall immediately find a considerable number produced from the higher classes, from those who live upon an income already provided, and upon branches of industry which produce an easy and ample subsistence. These have no occasion for the assistance of the state in bringing up their children, and you may encourage marriage, or permit celibacy in such classes, in proportion to the use you find for their offspring when they are brought up. When I come to the lower classes, I examine, for example, that of shoemakers, where I find a certain number produced. This number I first compare with the number of shoemakers actually existing, and then with the number of marriages subsisting among them, (for I suppose recapitulations of every kind) from which I discover the fertility of marriage, and the success of multiplication in that part. When the state of the question is examined, class by class, I can decide where marriage succeeds, and where it does not. I have said, that I imagine it an advantage that every class should support at least its own numbers; and when it does more, I should wish (were it possible) that the higher classes might be recruited from the lower, rather than the lower from the higher; the one seems a mark of prosperity, the other of decay: but I must confess that the first is by far the most difficult to be obtained.