Wrote Letter 19 of 1677-03-23 (AB 31) to Henry Oldenburg

March 23, 1677
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Text of the letter in the original Dutch and in English translation from Alle de Brieven. The Collected Letters at the DBNL - De Digitale Bibliotheek voor de Nederlandse Letteren

Leeuwenhoek wrote this letter to Henry Oldenburg about his method of counting so vast a number of living Creatures in one drop of water. He also complained about not getting published. He was replying to Oldenburg's letters of February 12/22 and February 26/March 4.

He also included a Latin translation with his Dutch letter. See the fragment labeled 21a in the photo below.

The photo below of Leeuwenhoek's handwritten manuscript is from the first of the four volumes of Leeuwenhoek's original letters in the archives of the Royal Society. The photo was taken by Mike Peel < MikePeel.net > and is available on Wikimedia Commons.