. Biology and its makers. Biology. 84 BIOLOGY AND ITS MAKERS emy of Sciences, of which he was elected a corresponding member in 1697, got twenty-seven; but the lion's share fell to the young Royal Society of London, which in fifty years—1673-1723—received 375 letters and ; " The works themselves, except that they lie in the domain of natural history, are disconnected and appear in no order of systematized study. The philosopher was led by what transpired at any moment to lead ; The Capillary Circulation.—In 1686 he observed the minute circulation of the blood, and dem
. Biology and its makers. Biology. 84 BIOLOGY AND ITS MAKERS emy of Sciences, of which he was elected a corresponding member in 1697, got twenty-seven; but the lion's share fell to the young Royal Society of London, which in fifty years—1673-1723—received 375 letters and ; " The works themselves, except that they lie in the domain of natural history, are disconnected and appear in no order of systematized study. The philosopher was led by what transpired at any moment to lead ; The Capillary Circulation.—In 1686 he observed the minute circulation of the blood, and demonstrated the capil- lary connection between arteries and veins, thus forging the passage of blood from arteries to veins. This was supplied by Leeuwenhoek. Fig. 20b shows one of his sketches of the capillary circulation. In his efforts to see the circulation he tried various animals; the comb of the young cock, the ears of white rabbits, the membraneous wing of the bat were progressively examined. The next advance came when he Fig. 20b.—The Capillary Circula- tion. (After Leeuwenhoek.). final link in the chain of observation showing the relation between these blood-vessels. This was perhaps his most important observation for its bearing on physiology. It must be remembered that Harvey had not actually seen the circulation of the blood, which he announced in 1628. He assumed on en- tirely sufficient grounds the existence of a complete cir- culation, but there was wanting in his scheme the direct ocular proof of the. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Locy, William A. (William Albert), 1857-1924. New York, H. Holt and company
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