A man in Africa sitting imprisoned on the ground, with his hands and feet locked into holes made in cut-down tree trunks. Wood engraving after P.B. Du Chaillu, 1867.

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A man in Africa sitting imprisoned on the ground, with his hands and feet locked into holes made in cut-down tree trunks. Wood engraving after P.B. Du Chaillu, 1867. Wellcome Collection. Public Domain Mark. Source: Wellcome Collection.