Wrote Letter 37 of 1683-01-22 (AB 70) to Christopher Wren about the function of the ovary, muscles of insects, drinking tea and mild beer, erythrocytes, and a theory on the formation of blood

January 22, 1683
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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 original manuscript on eighteen quarto pages, written and signed by Leeuwenhoek, is preserved at the Royal Society (MS. 1896. L 1. 67). The seven drawings are lost.