"The four bodily humors were part of Shakespearean cosmology, inherited from the ancient Greek philosophers Aristotle, Hippocrates, and Galen."
"Organized around the four elements of earth, water, air, and fire; the four qualities of cold, hot, moist, and dry; and the four humors, these physical qualities determined the behavior of all created things including the human body."
Henry Peacham, Minerva Britanna, 1612.
By permission of the Folger Shakespeare Library
Robert Burton, Anatomy of Melancholy, 1628.
Courtesy National Library of Medicine