William Harvey — "I began to think whether there might not be a motion as it were in a circle."
I began to think whether there might not be a motion as it were in a circle.
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More from William Harvey
"The study of nature is the study of God."
"Without the circulation of the blood, there can be no true life."
"It is a thing worthy of observation how much more easily and quickly the mind is deceived than the eye."
"I have not only affirmed, but also demonstrated, the circulation of the blood."
"We are taught by nature to begin with the simple and proceed to the complex."
About William Harvey (1578-1657)
English physician whose On the Motion of the Heart and Blood in Animals (1628) demonstrated blood circulation, overturning 1,400 years of Galenic medicine. Closely associated with Francis Bacon (his contemporary in the new English empiricism). For an intellectual contrast, see Galenic medicine, the 2nd-century Greek medical tradition (humors, blood-as-consumed-fuel) — Harvey calculated that the heart pumps more blood per hour than the body could possibly produce as fuel — a single quantitative observation that demolished the entire Galenic-Aristotelian medical worldview. The cleanest example in medical history of arithmetic disproving 14 centuries of authority.
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Understanding this quote
What it means
Harvey is describing his pivotal hypothesis: that blood moves in a continuous closed loop rather than being consumed and regenerated as Galenic medicine assumed. 'Motion in a circle' means blood pumped from the heart through arteries returns through veins in a perpetual cycle — the heart as a pump, not a furnace. This single question overturned 1,400 years of accepted physiology and established the foundation of modern cardiovascular medicine.
Relevance to William Harvey
Harvey was a London physician and anatomist who spent years dissecting living and dead animals to study the heart's mechanics. He observed that cardiac valves permitted only one-way flow, and calculated the heart pumped far more blood per hour than the liver could produce — mathematically demolishing Galen's production model. His cautious 'I began to think' reflects his methodical, evidence-first character before announcing a theory that upended centuries of received wisdom.
The era
In early 17th-century Europe, Galenic humoral medicine — unchallenged for 1,400 years — held that blood was produced in the liver, distributed to organs, and consumed. The Scientific Revolution was displacing ancient authority with observation: Vesalius had corrected Galen's anatomy in 1543, Galileo was challenging Aristotelian physics. Harvey's 1628 publication 'De Motu Cordis' landed in this intellectual climate, where empirical proof was beginning to outweigh inherited doctrine for the first time.
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