At no era, and in no country, have we ever observed the numbers of the human race increase with this frightful rapidity. According to the book of Genesis, the Hebrews who entered Egypt amounted to seventy couples;[87] and we find from the book of Numbers that when Moses numbered the people, two centuries afterwards, they amounted to six hundred thousand men above twenty-one years of age,[88] which supposes a population of two millions at least. From this we may infer that the period of doubling was fourteen years. Statistical tables can scarcely be admitted to control biblical facts. Shall we say that six hundred thousand men “able to go to war” supposes a population larger than two millions, and infer from that a period of doubling less than Euler has calculated? In that case, we should cast doubt either on the census of Moses or on the calculations of Euler. All that we contend for is, that it should not be pretended that the Hebrews multiplied with greater rapidity than it is possible to multiply.
After this example, which is probably that in which actual fecundity approximates most nearly to virtual fecundity, we have [p408] the case of the United States of America, where we know that the population doubles in less than twenty-five years.
It is unnecessary to pursue such researches further. It is sufficient to know that in our species, as in all, the organic power of multiplication is superior to the actual multiplication. Moreover, it would involve a contradiction to assert that the actual surpasses the virtual.
Alongside of this absolute power, which it is unnecessary to determine more exactly, and which we may safely regard as uniform, there exists, as we have said, another force, which limits, compresses, suspends, to a certain extent, the action of the first, and opposes to it obstacles of different kinds, varying with times and places, with the occupations, the manners, the laws, or the religion of different nations.
I denominate this second force the law of limitation; and it is evident that the progress of population in each country, and in each class, is the result of the combined action of these two laws.
But in what does this law of limitation consist? We may say in a very general way that the propagation of life is restrained or prevented by the difficulty of sustaining life. This idea, which we have already expressed in the terms of the formula of Malthus, it is of importance to develop farther, for it is the essential part of our subject.[89]
Organized existences, which are indued with life, but without feeling, are entirely passive in this struggle between the two principles. As regards vegetables, it is strictly true that the number of each species is limited by the means of subsistence. The profusion of germs is infinite, but the resources of space and territorial fertility are not so. These germs injure or destroy one another; they fail to grow, or they take root and come to maturity only to the extent that the soil allows of. Animals are endued with feeling, but they would seem in general to be destitute of foresight. They breed, increase, and multiply without regard to the fate of their offspring. Death, premature death, alone limits their multiplication, and maintains the equilibrium between their numbers and their means of subsistence.
M. de Lamennais, in his inimitable language, thus addresses the people:—
“There is room enough in the world for all, and God has made it fertile enough to supply the wants of all.” And, further on, he says,—“The Author of the universe has not assigned a worse [p409] condition to man than to the inferior animals. Are not all invited to the rich banquet of nature? Is one alone excluded?” And, again, he adds,—“Plants extend their roots from one field to another, in a soil which nourishes them all, and all grow there in peace; none of them absorbs the sap of another.”
In all this we see only fallacious declamation, which serves as the basis of dangerous conclusions; and we cannot help regretting that an eloquence so admirable should be devoted to giving popular currency to the most fatal of errors.