Wrote Letter 54 of 1687-05-09 (AB 99) to Members of the Royal Society about the structure of 'stone' of the medlar and the coffee bean and acid in plants

May 9, 1687
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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, written and signed by Leeuwenhoek, is preserved at the Royal Society (MS. 1917. L 2. 8).