exterminate, the last man among them would be a typical negro, or, at all events, approximating nearest to the typical standard. But it is in the female hybrid that this tendency to decay, or this vice of constitutional formation, is most apparent. Many of them are incapable of nourishing or taking care of their offspring, and, together with miscarriages and the numerous forms of disease connected with maternity, they are often found to have had a large number of children, not one of whom reached maturity. In taking into view, therefore, the sterility of mulattoism, we must have regard to its vices of formation as well as its limited virility, and that nature completes her processes, whether of growth or decay, through many different forms; and while mulattoism is as absolutely confined to four generations as mules are to a single generation, the former result is worked out through constitutional fragility and limited longevity as much, perhaps, as by an imperfect reproductive capacity. It is seen, therefore, that Prichard and the European ethnologists made a radical mistake in this matter, and the very proofs which they relied on to establish their single-race theory, or that whites and negroes were of the same species, actually prove the precisely opposite fact, that they are of different species. Not only is the phenomenon of hybridity different in human beings, from that peculiar to animals, but it differs in the different races of the former. The author’s inquiries on this subject have been limited to the white and negro races or species, but the evidence presented to his observation, during the war with Mexico, was sufficiently authentic to warrant the conclusion that hybrids have greater tenacity of life, when the offspring of whites and aborigines, than in the case of whites and negroes. The former approximate closer to our own race, and it is only reasonable to suppose that, in precise proportion to this fact, or to this starting-point, is the hybrid offspring endowed with vitality; and the same rule may be applied with equal certainty to all the other species of men. The sexual instinct, or the instinct of reproduction, is universal in animal existence. It is that which multiplies its kind, that peoples the earth and fills the world with innumerable tribes of beings and endless processions of generations, each after its kind exhibiting the same qualities and subject to the same laws as the original types, without the slightest atom of change, though countless generations intervene between them. In respect to human beings endowed with reason and moral feeling, it is evidently designed by the Almighty Creator of all that the instinct of reproduction should be held in subjection to those higher qualities. Nevertheless, instinct in respect to the sexual functions is strikingly manifest in the lower races of mankind.