Four faces: a European, a Mongolian, an Ethiopian, and a profile of Samuel Johnson; three frontal silhouettes; three skulls of the same races seen from above (in the order European, Ethiopian and Mongolian). Coloured engraving by J. Pass, 1824.

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Four faces: a European, a Mongolian, an Ethiopian, and a profile of Samuel Johnson; three frontal silhouettes; three skulls of the same races seen from above (in the order European, Ethiopian and Mongolian). Coloured engraving by J. Pass, 1824. Wellcome Collection. Public Domain Mark. Source: Wellcome Collection.