Other circumstances being the same, it may be affirmed that countries are populous according to the quantity of human food which they produce, and happy according to the liberality with which that food is divided, or the quantity which a day's labour will purchase. Corn countries are more populous than pasture countries, and rice countries more populous than corn countries.
The lands in England are not suited to rice, but they would all bear potatoes; and Dr Adam Smith observes that if potatoes were to become the favourite vegetable food of the common people, and if the same quantity of land was employed in their culture as is now employed in the culture of corn, the country would be able to support a much greater population, and would consequently in a very short time have it.
The happiness of a country does not depend, absolutely, upon its poverty or its riches, upon its youth or its age, upon its being thinly or fully inhabited, but upon the rapidity with which it is increasing, upon the degree in which the yearly increase of food approaches to the yearly increase of an unrestricted population. This approximation is always the nearest in new colonies, where the knowledge and industry of an old state operate on the fertile unappropriated land of a new one. In other cases, the youth or the age of a state is not in this respect of very great importance. It is probable that the food of Great Britain is divided in as great plenty to the inhabitants, at the present period, as it was two thousand, three thousand, or four thousand years ago. And there is reason to believe that the poor and thinly inhabited tracts of the Scotch Highlands are as much distressed by an overcharged population as the rich and populous province of Flanders.
Were a country never to be overrun by a people more advanced in arts, but left to its own natural progress in civilization;from the time that its produce might be considered as an unit, to the time that it might be considered as a million, during the lapse of many hundred years, there would not be a single period when the mass of the people could be said to be free from distress, either directly or indirectly, for want of food. In every state in Europe, since we have first had accounts of it, millions and millions of human existences have been repressed from this simple cause; though perhaps in some of these states an absolute famine has never been known.
Famine seems to be the last, the most dreadful resource of nature. The power of population is so superior to the power in the earth to produce subsistence for man, that premature death must in some shape or other visit the human race. The vices of mankind are active and able ministers of depopulation. They are the precursors in the great army of destruction; and often finish the dreadful work themselves. But should they fail in this war of extermination, sickly seasons, epidemics, pestilence, and plague, advance in terrific array, and sweep off their thousands and ten thousands. Should success be still incomplete, gigantic inevitable famine stalks in the rear, and with one mighty blow levels the population with the food of the world.
Must it not then be acknowledged by an attentive examiner of the histories of mankind, that in every age and in every state in which man has existed, or does now exist.
That the increase of population is necessarily limited by the means of subsistence.
That population does invariably increase when the means of subsistence increase. And that the superior power of population.it repressed, and the actual population kept equal to the means of subsistence, by misery and vice?
