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Politics : Formerly About Advanced Micro Devices
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To: James Seagrove who wrote (1014176)5/3/2017 9:20:05 AM
From: Wharf Rat  Read Replies (1) of 1574263
 
thanks


This illustration depicts one of William Harvey's experiments in his On the Circulation of the Blood (1628). Venal valves had already been discovered, but here Harvey shows that venal blood flows only toward the heart. He ligatured an arm to make obvious the veins and their valves, then pressed blood away from the heart and showed that the vein would remain empty because blocked by the valve.
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