Wrote letter of 1679-06-13 (AB 49) to Lambert van Velthuysen

June 13, 1679
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The signed autograph on three quarto pages is in the Leiden University library (Cod. 1730. B.P.L. 885).

Leeuwenhoek wrote this letter about the origin of life to Lambert van Velthuysen, a supporter from Utrecht. It was not published during Leeuwenhoek's lifetime. It was one of a dozen letters that P. Haaxman contributed to the 1875 exhibition. Harting summarized this letter in the exhibition's Gedenkboek.