Public Domain Mark
You can use this work for any purpose without restriction under copyright law. Read more about this licence.
Credit
A profile of a man bisected with a curve for measuring the brain, skulls of a Turk (top right), a Georgian woman (bottom left) and a Caribbean (bottom right). Coloured engraving by H. Adlard, 1824. Wellcome Collection. Public Domain Mark. Source: Wellcome Collection.