1883 Darwin: “When two races, both low in the scale, are crossed the progeny seems to be eminently bad.”
Darwin, Charles. 1868, 1883. The Variation of Animals and Plants under Domestication (NY: D. Appleton & Co.)
Chapter XIII: Inheritance Continued-- Reversion of Atavism, page 22:
47 'Journal of Researches,' 1845, p. 71. 48 'Expedition to the Zambesi,' 1865, pp. 25, 150. 49 Dr. P. Broca, on 'Hybridity in the Genus Homo,' Eng. translat., 1864, p. 39.
These latter facts remind us of the statements, so frequently made by travellers in all parts of the world, on the degraded state and savage disposition of crossed races of man. That many excellent and kind-hearted mulattos have existed no one will dispute; and a more mild and gentle set of men could hardly be found than the inhabitants of the island of Chiloe, who consist of Indians commingled with Spaniards in various proportions. On the other hand, many years ago, long before I had thought of the present subject, I was struck with the fact that, in South America, men of complicated descent between Negroes, Indians, and Spaniards, seldom had, whatever the cause might be, a good expression.47 Livingstone-- and a more unimpeachable authority cannot be quoted,-- after speaking of a half-caste man on the Zambesi, described by the Portuguese as a rare monster of inhumanity, remarks, "It is unaccountable why half- castes, such as he, are so much more cruel than the Portuguese, but such is undoubtedly the case." An inhabitant remarked to Livingstone, "God made white men, and God made black men, but the Devil made halfcastes."48 When two races, both low in the scale, are crossed the progeny seems to be eminently bad. Thus the noble-hearted Humboldt, who felt no prejudice against the inferior races, speaks in strong terms of the bad and savage disposition of Zambos, or half-castes between Indians and Negroes; and this conclusion has been arrived at by various observers.49 From these facts we may perhaps infer that the degraded state of so many half-castes is in part due to reversion to a primitive and savage condition, induced by the act of crossing, even if mainly due to the unfavourable moral conditions under which they are generally reared.