History of Cardiovascular Physiology, Dr. D. Penney

Hippocrates and Galen:

Four Humours (ascribed to Hippocrates)

Blood

Yellow bile - found in the gall bladder

Black bile - found in the spleen

Phlegm - found in the pituitary

Three Spirits (added by Galen)

'Natural spirit' of the liver

'Vital spirit' of the heart

'Animal spirit' of the brain