On Temperaments. On Non-Uniform Distemperment. The Soul's Traits Depend on Bodily Temperament

In On Temperaments, Galen of Pergamum sets out his concept of the combination of the four elemental qualities (hot, cold, wet, and dry), which is fundamental to his account of the structure and function of human, animal, and plant bodies. Two related works explore disturbances in this combination and their consequences.