William Harvey:

The valves in the veins are so constructed as to permit the passage of blood towards the heart, but to prevent its return.

— William Harvey Early Modern

Blood circulation

De Motu Cordis, Chapter 13

1628

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Cross Reference

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"The greatest pleasure is to be found in the contemplation of truth."

"The greatest pleasure is to discover something new."

"I began to think whether there might not be a motion as it were in a circle."

"The motion of the blood is in a circle, and is in truth perpetual."

"The heart does not draw the blood, but propels it."