Wrote Letter 49 of 1686-04-02 (AB 90) to Members of the Royal Society about the structure of bone, the bark of trees, skin and scales, the moisture evaporating from his body, and a little peeling piece of skin

April 2, 1686
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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 sixteen quarto pages, written and signed by Leeuwenhoek, is preserved at the Royal Society (MS. 1910. L 2. 1.).