When two proximate species of mankind, two races bearing a general resemblance to each other in type, are bred together—e.g.. Teutons, Celts, Pelasgians, Iberians, or Jews—they produce offspring perfectly prolific: although, even here, their, peculiarities cannot become so entirely fused into a homogeneous mass as to obliterate the original types of either. One or the other of these types will “crop-out,” from time to time, more or less apparently in their progeny. When, on the other hand, species the most widely separated, such as the Anglo-Saxon with the Negro, are crossed, a different result has course. Their mulatto offspring, if still prolific, are but partially so; and acquire an inherent tendency to run out, and become eventually extinct when kept apart from the parent stocks. This opinion is now becoming general among observers in our slave States; and it is very strongly insisted upon by M. Jacquinot. This skillful naturalist (unread in cis-Atlantic literature) claims the discovery as original with himself; although erroneously, because it had long previously been advocated by Estwick and Long, the historians of Jamaica; by Dr. Caldwell; by Professors Dickson and Holbrook, of Charleston, S. C.; and by numerous other leading medical men of our Southern States. There are some 4,000,000 of Negroes in the United States; about whom circumstances, personal and professional, have afforded me ample opportunities for observation. I have found it impossible, nevertheless, to collect such statistics as would be satisfactory to others on this point; and the difficulty arises solely from the want of chastity among mulatto women, which is so notorious as to be proverbial. Although often married to hybrid males of their own color, their children are begotten as frequently by white or other men, as by their husbands. For many years, in my daily professional visits, I have been in the habit of meeting with mulatto women, either free or slaves; and, never omitting an opportunity of inquiry with regard to their prolificacy, longevity of offspring, color of parents, age, &c., the conviction has become indelibly fixed in my mind that the positions laid down in the beginning of this chapter are true.
J. C. Nott, “Hybridity of Animals, Viewed in Connection with Mankind,” in Types of Mankind: or, Ethnological Researches, Based Upon the Ancient Monuments, Paintings, Sculptures, and Crania or Races and Upon their Natural, Geographical, Philological and Biblical History [Second Edition], J. C. Nott and Geo. R. Gliddon, (Philadelphia: Lippincott, Grambo & Co., 1854), 397-398.