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Omloop des Bloeds
Den Waaragtigen Omloop des Bloeds
On the True Circulation of the Blood, also that the Arteries and Veins are Continuous Blood Vessels, Set ready for the eyes. Discussed in a Letter, written to the Royal Society in London
The text of the letter is available in Dutch only at Project Gutenberg in a variety of formats.
The text of the letter is also available in English translation from Alle de Brieven. The Collected Letters at the DBNL - De Digitale Bibliotheek voor de Nederlandse Letteren. AB/CL number: 110; Cole's number: 65
During Edmond Halley's second term as editor of Philosophical Transactions, he published only two letters by Leeuwenhoek, both holdovers from the previous editor. During his first terms as editor in the late 1680's, he published none. Leeuwenhoek began publishing his own letters during this period in pamphlets and then bound books.
In addition, he published his 65th letter, dated September 7, 1688, as a separate 30-page pamphlet. He used his aalkijker (eel-viewer) as a showcase for visitors, "set ready for the eyes". He gave the visitors this pamphlet to take with them.
He published this letter with a half-dozen others from that period in Natuurs Verborgentheden Ontdekt: zijnde een Tweede Vervolg der Brieven. A copy of this volume with the illustration unfolded is on display in the Boerhaave Museum in Leiden.