Scientific racism
Samuel George Morton

In the 19th century, an early American physical anthropologist, physician and polygenist Samuel George Morton (1799–1851), collected human skulls from worldwide, and attempted a logical classification scheme. Influenced by contemporary racialist theory, Dr Morton said he could judge racial intellectual capacity by measuring the interior cranial capacity, hence a large skull denoted a large brain, thus high intellectual capacity. Conversely, a small skull denoted a small brain, thus low intellectual capacity; superior and inferior established. After inspecting three mummies from ancient Egyptian catacombs, Morton concluded that Caucasians and Negroes were already distinct three thousand years ago. Since interpretations of the bible indicated that Noah's Ark had washed up on Mount Ararat only a thousand years earlier, Morton claimed that Noah's sons could not possibly account for every race on earth. According to Morton's theory of polygenesis, races have been separate since the start.
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