Wrote Letter L-187 of 1687-05-09 to members of the Royal Society about the structure of 'stone' of the medlar and the coffee bean and acid in plants
Date:
May 9, 1687
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 eight quarto pages, written and signed by Leeuwenhoek, along with one smaller sheet containing seven ebgraved figures, is preserved at the Royal Society (MS. 1917. Early Letters L2.10).
An English translation is found at Early Letters L2.11.