Excerpt from The Heart and Its Function
Notwithstanding the many millions of years which our world and race have, according to some, already existed, the discovery of the circulation of the blood is but a thing of yesterday. From some passages in his work, "De Trinitatis Erroribus," published in 1531, Servetus would seem to have been fully aware of the lesser or pulmonary circulation. But it was not till 1628 that the doctrine of the circulation of the blood through the system generally was actually published by Dr. William Harvey, though indeed he had taught it publicly from the year 1619. It was not, however, till 1661, more than thirty years subsequently, that the circulation of the blood was actually demonstrated by means of the microscope, by Malpighi, so that this important fact has been known for little more than two centuries.
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