I don't understand the Romans' linking of humor, season, and characteristics for Humours 1-3. E.g. for 1: 1.1. Why'd black bile predominate in autumn (which I agree, is cold and dry)?
1.2. Why'd coldness + dryness, be linked to despondency, thoughtfulness? The Romans wouldn't have needed modern science to feel that coldness + dryness hinder human metabolism?
2.1. Same two questions each for Humours #2-3.
4 is the only humour with which I can empathize, as modern science substantiates heat to cause anger. Picture on the left, the right: