In prescientific times, a discredited notion held that human health depended on the correct balance of four "humors," including blood, which was not known to circulate.At that time, leeches were used in bleeding to supposedly reduce the amount of blood as a humor, but today

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Leeches are still used in modern medicine to eliminate pools of coagulated blood, particularly after surgeries or in cases of skin grafting. This is done because leeches secrete anticoagulants that prevent blood from clotting, allowing it to flow more freely and prevent the formation of blood clots. The traditional use of leeches to balance the four humors is no longer accepted as valid in modern medicine.

In Prescientific Times, a Discredited Notion Held That Human Health