b'\n_START_ARTICLE_\nWilliam Charles Wells\n_START_PARAGRAPH_\nWilliam Charles Wells (1757-1817) fue un m\xc3\xa9dico escoc\xc3\xa9s recordado por haber expuesto el primer postulado claro acerca de la selecci\xc3\xb3n natural como mecanismo evolutivo. Aplic\xc3\xb3 esta idea a la explicaci\xc3\xb3n del origen de los colores de piel en las razas humanas.\n_START_SECTION_\nLa idea de Wells\n_START_PARAGRAPH_\nWells fue el mayor de tres m\xc3\xa9dicos brit\xc3\xa1nicos que expresaron teor\xc3\xadas evolucionistas entre 1813 y 1819. Los otros fueron James Cowles Prichard y William Lawrence._NEWLINE_En 1813, un art\xc3\xadculo de Wells fue le\xc3\xaddo en la Royal Society y publicado en 1818. Se trat\xc3\xb3 de Two Essays... with some observations on the causes of the differences of colour and form between the white and negro races of men. By the Late W.C. Wells\xe2\x80\xa6with a Memoir of his life, written by himself. El objetivo era tratar de explicar c\xc3\xb3mo surgieron las razas humanas.   Luego de algunas reflexiones preliminares en torno a las razas humanas y a la domesticaci\xc3\xb3n de animales, expres\xc3\xb3:_NEWLINE_What was done for animals artificially] seems to be done with equal efficiency, though more slowly, by nature, in the formation of varieties of mankind, fitted for the country which they inhabit. Of the accidental varieties of man, which would occur among the first scattered inhabitants, some one would be better fitted than the others to bear the diseases of the country. This race would multiply while the others would decrease, and as the darkest would be the best fitted for the [African] climate, at length [they would] become the most prevalent, if not the only race._NEWLINE_Two essays: upon a single vision with two eyes, the other on dew (1818), Wells W.C._NEWLINE_Charles Darwin y Alfred Russel Wallace no tuvieron noticia de este trabajo cuando publicaron sus teor\xc3\xadas en 1858, pero m\xc3\xa1s tarde Darwin acept\xc3\xb3:_NEWLINE_In this paper he [Wells] distinctly recognizes the principle of natural selection, and this is the first recognition which has been indicated; but he applies it only to man, and to certain characters alone. After remarking that negroes and mulattoes enjoy an immunity from certain tropical diseases, he observes, firstly, that all animals tend to vary in some degree, and, secondly, that agriculturalists improve their domesticated animals by selection; and then he adds, but what is done in this latter case by art, seems to be done with equal efficacy, though more slowly, in the formation of varieties of mankind, fitted for the country which they inhabit._NEWLINE_The origin of species by means of natural selection (1886), Charles Darwin_NEWLINE_Por lo tanto, el cr\xc3\xa9dito por la formulaci\xc3\xb3n de la hip\xc3\xb3tesis de la selecci\xc3\xb3n natural debe atribuirse a Wells m\xc3\xa1s que a Edward Blyth o a Patrick Matthew. Pero esta formulaci\xc3\xb3n ten\xc3\xada un alcance muy restringido comparada con las teor\xc3\xadas de Darwin y Wallace.'