other is in an arithmetical ratio; but, that in a particular and very important view of the subject, the extent of population is only limited by the extent of the earth, and that the increase of the means of subsistence will be in proportion to the greater extent of surface occupied, which may be enlarged as fast as there are numbers to occupy it. I have been thus particular, because mathematical terms carry with them an imposing air of accuracy and profundity, and ought, therefore, to be applied strictly, and with the greatest caution, or not at all. I should say, then, that looking at the subject in a general and philosophical point of view, I do not think that the expression of an arithmetical and geometrical series applies: for, with respect to the extent of ground occupied, which is one thing on which population depends, and in the first instance always, this might evidently be increased in any ratio whatever, that the increase of population would admit, until the earth was entirely occupied; and after that there would be no room either for a geometrical or arithmetical progression; it would be at an absolute stand. The distinction is therefore confined to the degree of art and diligence used in the cultivation of those parts which have been already occupied. This has no doubt gone on at a very slow kind of snail’s pace from the very first, and will I dare say continue to do so. Or to adopt Wallace’s distinction, the increase of population is either not restricted at all by the ‘limited nature of the earth,’ or it is limited absolutely by it: it is only kept back indefinitely by the ‘limited fertility’ of the earth; and it cannot be said to be kept back necessarily by this, while there are vast tracts of habitable land left untouched. Till there is no more room, and no more food to be procured without extreme exertion and contrivance, the arithmetical and geometrical ratios do not naturally begin to operate; and the gradual increase that might take place after that period, is not in my opinion (who am no great speculator) of sufficient importance to deserve a pompous appellation. I would, therefore, rather stop there, because it will simplify the question. Till the world is full, or at least till every country is full, that is, maintains as many inhabitants as the soil will admit, namely, till it can be proved satisfactorily that it might not by taking proper methods be made to maintain double the number that it does, the increase of mankind is not necessarily checked by the ‘limited extent of the earth,’ nor by its ‘limited fertility,’ but by other causes. Till then population must be said to be kept down, not by the original constitution of nature, but by the will of man. Till then, Mr. Malthus has no right to set up his arithmetical and geometrical ratios upon the face of the earth, and say they are the work of nature. You, Sir, will not be at a loss to perceive the fallacy which lurks under the gloss which Mr. Malthus has here added to