Wrote letter of 1674-04-24 (AB 7) to Constantijn Huygens

April 24, 1674
Standard reference information
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Leeuwenhoek's summary

I could not see anything in it, but on putting it at some distance before my microscope, I saw through the seed an amusing perspective of towers, and of everything in front of me, but extremely small and upside down.

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 Constantijn Huygens. Further observations about blood, bones, teeth, and salt.