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and have yellow skin.
* The people who are composed of black bile are lazy, fearful, and sickly. They have black hair and black eyes.
* Those who have phlegm are low spirited, forgetful, and have white hair.

Seventeenth century English playwright Ben Jonson wrote humor plays, where character types were based on their humoral complexion.

Blood

It was thought that the nutritional value of the blood was the source of energy for the

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