Based on a diagram from Isidore of Seville, Liber de responsione mundi (Augsburg, 1472). Original in the Huntington Library.

Four qualities, four elements, four seasons, four humours


season element humour body fluid location
Spring air sanguine blood heart
Summer fire choleric "yellow bile" liver
Autumn earth melancholic "black bile" spleen
Winter water phlegmatic phlegm (various)