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.[1] 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 are capable, though in very unequal degrees, of being withheld by prudence, or by the social affections, from giving existence to beings born only to misery
- ↑ 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.
