natural agents than those which are liable to be deficient either in quantity or in productive power. These may be all represented by the term land. Land, in the narrowest acceptation, as the source of agricultural produce, is the chief of them; and if we extend the term to mines and fisheries— to what is found in the earth itself, or in the waters which partly cover it, as well as to what is grown or fed on its surface, it embraces everything with which we need at present concern ourselves.
We may say, then, without a greater stretch of language than under the necessary explanation is permissible, that the requisites of production are Labour, Capital, and Land. The increase of production, therefore, depends on the properties of these elements. It is a result of the increase either of the elements themselves, or of their productiveness. The law of the increase of production must be a consequence of the laws of these elements; the limits to the increase of production must be the limits, whatever they are, set by those laws. We proceed to consider the three elements successively, with reference to this effect; or in other words, the law of the increase of production, viewed in respect of its dependence, first on Labour, secondly on Capital, and lastly on Land.
§ 2. The increase of labour is the increase of mankind; of population. On this subject the discussions excited by the Essay of Mr. Malthus have made the truth, though by no means universally admitted, yet so fully known, that a briefer examination of the question than would otherwise have been necessary will probably on the present occasion suffice.
The power of multiplication inherent in all organic life may be regarded as infinite. There is no one species of vegetable or animal, which, if the earth were entirely abandoned to it, and to the things on which it feeds, would not in a small number of years overspread every region of the globe, of which the climate was compatible with its existence. The
