ransacked the earth, concluded by repeopling it with a race not less barbarous than themselves? These æras, these great events, though so strongly marked in the History of Mankind, are yet only slight vicissitudes in the ordinary course of animated nature, which is in general always uniform and the same; its movements are regulated by two unchangeable wheels; the one, unbounded fecundity of every species; the other, the innumerable causes of destruction which are perpetually reducing the produce of that fecundity to a determinate measure, so as to preserve nearly the same number of individuals in each species. And as these multitudinous animals, which appear suddenly, disappear in the same manner, without augmenting their race, so does the human species always remain the same; the variations only are more slow, because the life of man being longer than that of small animals, the alternate changes of increase and diminution must necessarily require a greater portion of time. But time itself is only an instant in the succession of ages, and only strikes us the more forcibly, from having been accompanied with horror and destruction; for, taking all the inhabitants of the globe together, the number of the human race, like that of other animals, will, at all times, appear to be nearly the same; as this depends entirely upon an equilibrium of physical causes, an equilibrium to which every thing has long been reduced, and which neither the efforts of man, nor any moral circumstances whatever, can dissolve; those circumstances themselves being dependant on physical causes. Whatever care man may bestow on his own species, he will never be able to render it more numerous in one place without destroying or diminishing it in another[J]. As soon as any one country is overstocked with inhabitants they diffuse themselves over other countries, or destroy each other, and not unfrequently establish laws and customs calculated to prevent an excess of multiplication. In climates of exuberant fertility, as China, Egypt, and Guinea, they banish, mutilate, drown, or sell their infants; in Catholic countries they condemn them to perpetual celibacy. Those who actually exist find no difficulty in arrogating to themselves the disposal of the rights of those who have no existence. Considering themselves as necessary, they annihilate contingent beings, and scruple not to suppress future generations for their own ease and convenience. Mankind, without perceiving it, treat their own species exactly in the same manner as they do other animals; they cherish and multiply, or neglect and destroy them, according as it suits their purpose; and as all moral effects depend upon physical causes, which ever since the earth assumed its form, are fixed and permanent, it follows that in the human, as well as in the other animal species, the number must likewise be uniform and unalterable. It is to be observed that this fixed state, this permanent number, are not to be considered in an