This is, perhaps, no reason for accepting without reserve the opinions of Dr. Nott. Before giving a definite judgment, we must wait for further numerous, authentic, and scientific observations. Nevertheless, it must be remarked, that the indefinite fecundity of Mulattoes had been admitted as an axiom, which it was thought there was no necessity of disproving. It was sufficient to say there are many Mulattoes, without investigating whether they maintain themselves, or by continuous intermixture with the parent stocks. The first who wished to inquire more closely has, by his observations, been led to results opposed to general opinion. To these observations, presenting apparently the guarantee of authenticity, positive observation should be opposed; and it is requisite that the latter should be specially collected in countries where the _Germanic_ race has intermarried with the Negro race of Western Africa. The investigations which might be made in the French, Spanish, or Portuguese colonies would have no direct application. The authors, moreover, we have cited, are far from being the only ones who have denied the fecundity of the Mulattoes in the West Indies. Van Amringe and Hamilton Smith assert, that without a reunion with the parent stocks the Mulattoes would soon become extinct. Day says that Mulattoes are rarely prolific between themselves; and Waitz, somewhat shaken by these testimonies, adds in a note, “The sterility of Mulattoes, when it is complete, may be compared with that fact recognised by Wirgman in plants, that the hybrids of intermediate types between the two parent stocks are sterile, whilst those resembling one or the other species are prolific.”[32] From these facts and testimonies there seems to result--1. That the Mulattoes of the Germanic and Ethiopian races possess little prolificacy: 2. That they are inferior in this respect to the Mulattoes born by the intercourse of Negro women and men belonging to the more or less dark complexioned Caucasian races.