humours also corresponded to the four seasons. Thus blood, which was considered hot and wet, corresponded to spring. Yellow bile, considered hot and dry, corresponded to summer. Black bile, cold and dry, corresponded to autumn. And finally, phlegm, cold and wet, corresponded to winter.

These properties were considered the basis of health and disease. This meant that having a balance and good mixture of the humours defined good health, while an imbalance or separation of the humours led to disease. Because the humours corresponded to certain