Human and ape skulls: eight outline diagrams, comparing the proportions of skulls of different racial types with those of an orang utan and a monkey. Engraving by T. Milton, 1807.

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Human and ape skulls: eight outline diagrams, comparing the proportions of skulls of different racial types with those of an orang utan and a monkey. Engraving by T. Milton, 1807. Wellcome Collection. Public Domain Mark. Source: Wellcome Collection.