Wrote Letter 21 of 1677-10-05 (AB 33) to Henry Oldenburg

October 5, 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 (who had died a month earler in September) about skin, eels, fleas, and measuring and counting microorganisms.

He enclosed five letters with the testimony of eight credible eye-witnesses to microorganisms in infusions.