seems much confusion of ideas. The part which nature has in any work of man, is indefinite and incommensurable. It is impossible to decide that in any one thing nature does more than in any other. One cannot even say that labour does less. Less labour may be required; but if that which is required is absolutely indispensable, the result is just as much the product of labour, as of nature. When two conditions are equally necessary for producing the effect at all, it is unmeaning to say that so much of it is produced by one and so much by the other; it is like attempting to decide which half of a pair of scissors has most to do in the act of cutting; or which of the factors, five and six, contributes most to the production of thirty. The form which this conceit usually assumes, is that of supposing that nature lends more assistance to human endeavours in agriculture, than in manufactures. This notion, held by the French Economistes, and from which Adam Smith was not free, arose from a misconception of the nature of rent. The rent of land being a price paid for a natural agency, and no such price being paid in manufactures, these writers imagined that since a price was paid, it was because there was a greater amount of service to be paid for: whereas a better consideration of the subject would have shown that the reason why the use of land bears a price is simply the limitation of its quantity, and that if air, heat, electricity, chemical agencies, and the other powers of nature employed by manufacturers, were sparingly supplied, and could, like land, be engrossed and appropriated, a rent could be exacted for them also.
§ 4.This leads to a distinction which we shall find to be of primary importance. Of natural powers, some are unlimited, others limited in quantity. By an unlimited quantity is of course not meant literally, but practically unlimited: a quantity beyond the use which can in any, or at least in present circumstances, be made of it. Land is, in some newly settled countries, practically unlimited in quantity:
