Darwin, chapter 7 - “On the Races of Man,” two paragraphs in the section "On the Extinction of the Races of Man"
"Extinction follows chiefly from the competition of tribe with tribe, and race with race. Various checks are always in action, serving to keep down the numbers of each savage tribe,-- such as periodical famines, nomadic habits and the consequent deaths of infants, prolonged suckling, wars, accidents, sickness, licentiousness, the stealing of women, infanticide, and especially lessened fertility. If any one of these checks increases in power, even slightly, the tribe thus affected tends to decrease; and when of two adjoining tribes one becomes less numerous and less powerful than the other, the contest is soon settled by war, slaughter, cannibalism, slavery, and absorption. Even when a weaker tribe is not thus abruptly swept away, if it once begins to decrease, it generally goes on decreasing until it becomes extinct.* * Gerland, ibid., s. 12, gives facts in support of this statement. == Finally, although the gradual decrease and ultimate extinction of the races of man is a highly complex problem, depending on many causes which differ in different places and at different times; it is the same problem as that presented by the extinction of one of the higher animals-- of the fossil horse, for instance, which disappeared from South America, soon afterwards to be replaced, within the same districts, by countless troups of the Spanish horse. The New Zealander seems conscious of this parallelism, for he compares his future fate with that of the native rat now almost exterminated by the European rat. Though the difficulty is great to our imagination, and really great, if we wish to ascertain the precise causes and their manner of action, it ought not to be so to our reason, as long as we keep steadily in mind that the increase of each species and each race is constantly checked in various ways; so that if any new check, even a slight one, be superadded, the race will surely decrease in number; and decreasing numbers will sooner or later lead to extinction; the end, in most cases, being promptly determined by the inroads of conquering tribes."
Immediately following “conquering tribes” is the section “On the Formation of the Races of Man,” which has early on the first of these Darwin remarks:
- [1871/ 74/ 88 Darwin]“Europeans and Hindoos… belong to the same Aryan stock… Jews… belong to the Semitic stock”
- [1872 Darwin]“Blushing is evident in all the Aryan nations of Europe… The
Semitic races blush freely, as might have been expected, from their
general similitude to the Aryans.”
- [Darwin]"Dr. Saviotti in… 1871… remarks that it more frequently
occurs in prognathous skulls, not of the Aryan race, than in others"
Compare the “On the Extinction of the Races of Man” paragraphs with Hitler’s war against Jews.