[43] Mr. Gutzlaff, the Chinese missionary, has been struck with the little fecundity of the Mulattoes of Cambojia, the offspring of the native race and the immigrant Chinese. Cambojia is situated south-west of Siam, south of Anam, between 10° and 14°. “It is remarkable,” he observes, “that the marriages of native females with the Chinese are productive at the first generation, but become gradually sterile, and completely so at the fifth generation. I have seen many such cases; but, I cannot explain such a degeneration between nations so similar in physical conformation, and their mode of life. If it were not so, the Chinese race ought to become predominant, and absorb the native race in a few centuries. Such has not been the case, and the innumerable immigrants which China pours in appear scarce among the population.” (Gutzlaff, _Geography of the Cochin-Chinese Empire, Journal of the Royal Geographical Society of London_, vol. xix, p. 108, London. 1849.) [44] It is unknown what is the degree of intermixture in the hybrid populations of Mexico and South America; the observations relative to these crossings are extremely difficult to collect, for the variation of Mulattoes of different degrees is not so apparent as in the Mulattoes, Quadroons, etc., of Negroes and Europeans. With regard to colour, hair, shape of the cranium, the European races, especially those of the south, differ infinitely less from the American races than from the Ethiopian and the intermediate characters; even Mulattoes of the first degree are much less marked in the first than in the second case. Thus the famous Paulistas of the province of Saint-Paul, Brazil, issued from the union of Portuguese and Indians, constitute a vigorous class, brave, and even heroic, though ferocious and turbulent. According to certain authors, the European blood predominates in them; others, on the contrary, maintain that they are pure Indians. These contradictions prove the difficulty of estimating the degree of the intermixture between the Mulattoes sprung from Europeans and Indians. The question whether _Mulattoes of the first degree_ are indefinitely prolific _between themselves_,--whether they are habitually, or only exceptionally so, cannot be solved by travellers. Resident observers, and especially physicians, may ultimately furnish precise facts. [45] The Chabeins are eugenesic hybrids, while mules, properly so called, are dysgenesic hybrids.