Wrote letter of 1679-07-11 (AB 50) to Lambert van Velthuysen

July 11, 1679
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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.

The signed autograph letter on four quarto pages is currently in Gemeentearchief Delft, III B 58.

Leeuwenhoek wrote this letter about the chalk produced by gouty patients and about bladder stones. It was not published during his lifetime.