A seated figure of Time holding a scythe and an hourglass with a female figure of Geometry holding dividers and a female figure resting a book on her knee. Red chalk drawing.

Licence: Public Domain Mark

Credit: A seated figure of Time holding a scythe and an hourglass with a female figure of Geometry holding dividers and a female figure resting a book on her knee. Red chalk drawing. Wellcome Collection. Source: Wellcome Collection.