The Anthropological Society of London was founded in 1863 by Richard Francis Burton and Dr. James Hunt. It broke away from the existing Ethnological Society of London, founded in 1842, and defined itself in opposition to the older society. The Anthropological Society, Hunt proclaimed, would concern itself with the collection of facts and the identification of natural laws that explained the diversity of humankind. It would also cast its intellectual nets more broadly, dealing with the physical as well as the cultural aspects of humans. Richard Burton, portrait by Frederic Leighton, National Portrait Gallery, London. ... The Ethnological Society of London was founded in 1843 by a breakaway faction of the Aborigines Protection Society (APS). ... It has been suggested that Law of nature (precept) be merged into this article or section. ...

The real differences between the two societies ran much deeper. The members of the Ethnological Society were, on the whole, inclined to believe that humans were shaped by their environment; when Charles Darwin published his theory of evolution by natural selection, they supported it. They also believed in monogenism and tended to be politically liberal, especially on matters related to race. Charles Robert Darwin (12 February 1809 – 19 April 1882) was an English naturalist who achieved lasting fame by producing considerable evidence that species originated through evolutionary change, at the same time proposing the scientific theory that natural selection is the mechanism by which such change occurs. ... monogenism (or monogenesis) is a word meaning single origin. It has been used in various contexts as an antonym for polygenism, or multiple origin. Race In the nineteenth century the term monogenesis was used to refer to the theory, supported by traditional interpretations of the Bible, that human beings all...

Hunt and his closest followers were, in contrast, vehemently anti-Darwinian and strong supporters of polygenism. They found the Ethnological Society's politics distasteful, and (for example) supported the Confederacy in the American Civil War. The issue that most sharply divided the two groups was the "Negro question." Hunt believed that Africans belonged to a different species than caucasians [the polygenecist view], that they were substantially and irredeemably inferior, and that slavery was the role for which they were best suited. Polygenism is a biblical theory of human origins positing that the human races are of different lineages. ... “The Civil War” is the most common term for this conflict; see Naming the American Civil War. ...

Though many leading members of the Ethnological Society can be said to be committed to Britain's attempts to stamp out the slave trade, many members also believed that though all humans were of a common descent (i.e., the "monogenecists" view)and that people of African descent were indeed human, Africans (and, indeed other peoples) were nonetheless incapable of "civilization" and thus best suited to labour (and, by inference, slavery). Most members generally agreed on the subsequent northern migration of the "superior" tribes of "caucasian" peoples.

The two societies co-existed warily for eight years, but merged in 1871 to form the Royal Anthropological Institute of Great Britain and Ireland. The Royal Anthropological Institute of Great Britain and Ireland (RAI) (founded 1871) is the oldest anthropological society in the world. ...