: Galen’s Theory of Black Bile . This book/paper explores how the influential physician Galen had to "defend" the existence of black bile against rivals who (rightly) pointed out that it didn't seem to exist in healthy bodies like blood or phlegm do.
Published in History of European Ideas (2020), this paper by George Kazantzidis explores the radical shift in ancient thought when doctors first linked a physical substance to a mental state.
: It discusses the "violence" with which ancient thinkers forced black bile to fit the tetradic scheme (matching it with Earth, Autumn, and Cold/Dry qualities) despite it being the most elusive and "invisible" of the four humors.
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