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to the foregoing very moderate statements. I little knew how much stronger my language might have been without exceeding the truth, and how much the actual progress of French agriculture surpassed anything which I had at that time sufficient grounds to affirm. The investigations of that eminent authority on agricultural statistics, M. Leonce de Lavergne, undertaken by desire of the Academy of Moral and Political Sciences of the Institute of France, have led to the conclusion that since the Revolution of 1789, the total produce of French agriculture has doubled; profits and wages having both increased in about the same, and rent in a still greater ratio. M. de Lavergne, whose impartiality is one of his greatest merits, is, moreover, so far in this instance from the suspicion of having a case to make out, that he is labouring to show, not how much French agriculture has accomplished, but how much still remains for it to do. "We have required" (he says) "no less than seventy years to bring into cultivation two million hectares" (five million English acres) "of waste land, to suppress half our fallows, double our agricultural products, increase our population by 30 per cent, our wages by 100 per cent, our rent by 150 per cent. At this rate we shall require three quarters of a century more to arrive at the point which England has already attained." *
After this evidence, we have surely now heard the last of the incompatibility of small properties and small farms with agricultural improvement. The only question which remains open is one of degree; the comparative rapidity of agricultural improvement under the two systems; and it is the general opinion of those who are equally well acquainted with both, that improvement is greatest under a due admixture between them.
In the present chapter, I do not enter on the question between great and small cultivation in any other respect than as a question of production, and of the efficiency of labour. We shall return to it hereafter as affecting the distribution of the produce, and the physical and social well-being of the cultivators themselves; in which aspects it deserves, and requires, a still more particular examination.1
* Economic Bur ale de la France depuis 1789. Par M. Leonce de Lavergne, Membre de 1'Institut et de la Societe Centrale d'Agriculture de France. 2me ed. p. 59.
1 [See Appendix H. Large and Small Farming.]
OF THE LAW OF THE INCREASE OF LABOUR
§ 1. We have now successively considered each of the agents or conditions of production, and of the means by which the efficacy of these various agents is promoted. In order to come to an end of the questions which relate exclusively to production, one more, of primary importance, remains.
Production is not a fixed, but an increasing thing. When not kept back by bad institutions, or a low state of the arts of life, the produce of industry has usually tended to increase; stimulated not only by the desire of the producers to augment their means of consumption, but by the increasing number of the consumers. Nothing in political economy can be of more importance than to ascertain the law of this increase of production; the conditions to which it is subject: whether it has practically any limits, and what these are. There is also no subject in political economy which is popularly less understood, or on which the errors committed are of a character to produce, and do produce, greater mischief.
We have seen that the essential requisites of production are three—labour, capital, and natural agents; the term capital including all external and physical requisites which are products of labour, the term natural agents all those which are not. But among natural agents we need not take into account those which, existing in unlimited quantity, being incapable of appropriation, and never altering in their qualities, are always ready to lend an equal degree of assistance to production, whatever may be its extent; as air, and the light of the sun. Being now about to consider the impediments to production, not the facilities for it, we need advert to no other 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 degree of possible rapidity is different in different orders of beings; but in all it is sufficient, for the earth to be very speedily filled up. There are many species of vegetables of which a single plant will produce in one year the germs of a thousand; if only two come to maturity, in fourteen years the two will have multiplied to sixteen thousand and more. It is but a moderate case of fecundity in animals to be capable of quadrupling their numbers in a single year; if they only do as much in half a century, ten thousand will have swelled within two centuries to upwards of two millions and a half. The capacity of increase is necessarily in a geometrical progression: the numerical ratio alone is different.
To this property of organized beings, the human species forms no exception. Its power of increase is indefinite, and the actual multiplication would be extraordinarily rapid, if the power were exercised to the utmost. It never is exercised to the utmost, and yet, in the most favourable circumstances known to exist, which are those of a fertile region colonized from an industrious and civilized community, population has continued, for several generations, independently of fresh immigration, to double itself in not much more than twenty years.* That the capacity of multiplication in the human species exceeds even this, is evident if we consider how great is the ordinary number of children to a family, where the climate is good and early marriages usual; and how small a proportion of them die before the age of maturity, in the present state of hygienic knowledge, where the locality is healthy, and the family adequately provided with the means of living. It is a very low estimate of the capacity of increase, if we only assume, that in a good sanitary condition of the people, each generation may be double the number of the generation which preceded it.
Twenty or thirty years ago, these propositions might still have required considerable enforcement and illustration; but the evidence of them is so ample and incontestable, that they have made their way against all kinds of opposition, and may now be regarded as axiomatic: though the extreme reluctance felt to admitting them every now and then gives birth to some ephemeral theory, speedily forgotten, of a different law of increase in different circumstances, through a providential adaptation of the fecundity of the human species to the exigencies of society.f The obstacle to a just under
*  This has been disputed; but the highest estimate I have seen of the term which population requires for doubling itself in the United States, independently of immigrants and of their progeny—that of Mr. Carey—does not exceed thirty years.
f  One of these theories, that of Mr. Doubleday, may be thought to require a passing notice, because it has of late obtained some followers, and because it derives a semblance of support from the general analogies of organic life. This theory maintains that the fecundity of the human animal, and of all other living beings, is in inverse proportion to the quantity of nutriment: that an underfed population multiplies rapidly, but that all classes in comfortable circumstances are, by a physiological law, so unprolific, as seldom to keep up their numbers without being recruited from a poorer class. There is no doubt that a positive excess of nutriment, in animals as well as in fruit trees, is unfavourable to reproduction; and it is quite possible, though by no means proved, that the physiological conditions of fecundity may exist in the greatest degree when the supply of food is somewhat stinted. But any one who might be inclined to draw from this, even if admitted, conclusions at variance with the principles of Mr. Malthus, needs only be invited to look through a volume of the Peerage, and observe the enormous families, almost universal in that standing of the subject does not arise from these theories, but from too confused a notion of the causes which, at most times and places, keep the actual increase of mankind so far behind the capacity.
§ 3. Those causes, nevertheless, are in no way mysterious. What prevents the population of hares and rabbits from overstocking the earth? Not want of fecundity, but causes very different: many enemies, and insufficient subsistence; not enough to eat, and liability to be eaten. In the human race, which is not generally subject to the latter inconvenience, the equivalents for it are war and disease. If the multiplication of mankind proceeded only like that of the other animals, from a blind instinct, it would be limited in the same manner with theirs; the births would be as numerous as the physical constitution of the species admitted of, and the population would be kept down by deaths.* But the conduct of human creatures is more or less influenced by foresight of consequences, and by impulses superior to mere animal instincts: and they do not, therefore, propagate like swine, but
class; or call to mind the large families of the English clergy, and generally of the middle classes of England.
 It is, besides, well remarked by Mr. Carey, that, to be consistent with Mr. Doubleday's theory, the increase of the population of the United States, apart from immigration, ought to be one of the slowest on record.
 Mr. Carey has a theory of his own, also grounded on a physiological truth, that the total sum of nutriment received by an organized body directs itself in largest proportion to the parts of the system which are most used; from which he anticipates a diminution in the fecundity of human beings, not through more abundant feeding, but through the greater use of their brains incident to an advanced civilization. There is considerable plausibility in this speculation, and experience may hereafter confirm it. But the change in the human constitution which it supposes, if ever realized, will conduce to the expected effect rather by rendering physical self-restraint easier, than by dispensing with its necessity; since the most rapid known rate of multiplication is quite compatible with a very sparing employment of the multiplying power.
*  Mr. Carey expatiates on the absurdity of supposing that matter tends to assume the highest form of organization, the human, at a more rapid rate than it assumes the lower forms, which compose human food; that human beings multiply faster than turnips and cabbages. But the limit to the increase of mankind, according to the doctrine of Mr. Malthus, does not depend on the power of increase of turnips and cabbages, but on the limited quantity of the land on which they can be grown. So long as the quantity of land is practically unlimited, which it is in the United States, and food, consequently, can be increased at the highest rate which is natural to it, mankind also may, without augmented difficulty in obtaining subsistence, increase at their highest rate. When Mr. Carey can show, not that turnips and cabbages, but that the soil itself, or the nutritive elements contained in it, tend naturally to multiply, and that too at a rate exceeding the most rapid possible increase of mankind, he will have said something to the purpose. Till then, this part at least of his .argument may be considered as non-existent.