William Harvey — "I confess that I have been led to embrace this opinion by a careful consideratio…"
I confess that I have been led to embrace this opinion by a careful consideration of the structure and use of the valves in the veins.
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More from William Harvey
"I have often wondered, and indeed not a little, at the great difference of opinion among anatomists and physicians in the matter of the pulse and the motion of the heart."
"The blood in the animal body is impelled in a circle, and is in a state of ceaseless motion."
"The wise man will not be content with the knowledge of things as they are, but will seek to know how they came to be so."
"Nature is nowhere accustomed to exhibit herself more openly than in her failures."
"I have not only affirmed, but also demonstrated, that the motion of the heart is a perpetual circulation of the blood."