It was suggested to me same years since by persons for whose judgment I have a high respect, that it might be advisable, in a new edition, to throw out the matter relative to systems of equality, to Wallace, Condorcet and Godwin, as having in a considerable degree lost its interest, and as not being strictly connected with the main subject of the Essay, which is an explanation and illustration of the theory of population. But independently of its being natural for me to have some little partiality for that part of the work which led to those inquiries on which the main subject rests; I really think that there should be somewhere on record an answer to systems of equality founded on the principle of population; and perhaps such an answer is as appropriately placed, and is likely to have as much effect, among the illustrations and applications of the principle of population, as in any other situation to which it could be assigned.