Mr King, in 1693, stated the proportion of the births to the burials throughout the Kingdom, exclusive of London, as 115 to 100. Dr Short makes it, in the middle of the present century, 111to 100, including London. The proportion in France for five years, ending in 1774, was 117 to 100. If these statements are near the truth; and if there are no very great variations at particular periods in the proportions, it would appear that the population of France and England has accommodated itself very nearly to the average produce of each country. The discouragements to marriage, the consequent vicious habits, war, luxury, the silent though certain depopulation of large towns, and the close habitations, and insufficient food of many of the poor, prevent population from increasing beyond the means of subsistence; and, if I may use an expression which certainly at first appears strange, supercede the necessity of great and ravaging epidemics to repress what is redundant. Were a wasting plague to sweep off two millions in England, and six millions in France, there can be no doubt whatever that, after the inhabitants had recovered from the dreadful shock, the proportion of births to burials would be much above what it is in either country at present.
In New Jersey, the proportion of births to deaths on an average of seven years, ending in 1743, was as 300 to 100. In France and England, taking the highest proportion, it is as 117to 100. Great and astonishing as this difference is, we ought not to be so wonder-struck at it as to attribute it to the miraculous interposition of heaven. The causes of it are not remote, latent and mysterious; but near us, round about us, and open to the investigation of every inquiring mind. It accords with the most liberal spirit of philosophy to suppose that not a stone can fall, or a plant rise, without the immediate agency of divine power. But we know from experience that these operations of what we call nature have been conducted almost invariably according to fixed laws. And since the world began, the causes of population and depopulation have probably been as constant as any of the laws of nature with which we are acquainted.
The passion between the sexes has appeared in every age to be so nearly the same that it may always be considered, in algebraic language, as a given quantity. The great law of necessity which prevents population from increasing in any country beyond the food which it can either produce or acquire, is a law so open to our view, so obvious and evident to our understandings, and so completely confirmed by the experience of every age, that we cannot for a moment doubt it. The different modes which nature takes to prevent or repress a redundant population do not appear, indeed, to us so certain and regular, but though we cannot always predict the mode we may with certainty predict the fact. If the proportion of births to deaths for a few years indicate an increase of numbers much beyond the proportional increased or acquired produce of the country, we may be perfectly certain that unless an emigration takes place, the deaths will shortly exceed the births; and that the increase that had taken place for a few years cannot be the real average increase of the population of the country. Were there no other depopulating causes, every country would, without doubt, be subject to periodical pestilences or famine.
The only true criterion of a real and permanent increase in the population of any country is the increase of the means of subsistence. But even, this criterion is subject to some slight variations which are, however, completely open to our view and observations. In some countries population appears to have been forced, that is, the people have been habituated by degrees to live almost upon the smallest possible quantity of food. There must have been periods in such counties when population increased permanently, without an increase in the means of subsistence.
China seems to answer to this description. If the accounts we have of it are to be trusted, the lower classes of people are in the habit of living almost upon the smallest possible quantity of food and are glad to get any putrid offals that European labourers would rather starve than eat. The law in China which permits parents to expose their children has tended principally thus to force the population. A nation in this state must necessarily be subject to famines. Where a country is so populous in proportion to the means of subsistence that the average produce of it is but barely sufficient to support the lives of the inhabitants, any deficiency from the badness of seasons must be fatal. It is probable that the very frugal manner in which the Gentoos are in the habit of living contributes in some degree to the famines of indostan.
In America, where the reward of labour is at present so liberal, the lower classes might retrench very considerably in a year of scarcity without materially distressing themselves. Afamine therefore seems to be almost impossible. It may be expected that in the progress of the population of America, the labourers will in time be much less liberally rewarded. The numbers will in this case permanently increase without a proportional increase in the means of subsistence.
