In Galen's Theory of Black Bile: Hippocratic Tradition, Manipulation, Innovation Keith Stewart analyses Galen's characterisation of black bile to understand the different ways it is used in his arguments that cannot always be reconciled with the content of his sources.

Keith Andrew Stewart, Ph.D. (2017), University of Exeter, UK, is a teacher and tutor. He began his career as a scientist with a B.Sc. in Physics (1998), but has transferred to the humanities, teaching Classics and Ancient History.