Wrote Letter L-173 of 1686-04-02 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
Standard reference information
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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 16 quarto pages, written by a copyist and signed by Leeuwenhoek, is preserved at the Royal Society (MS. 1910. Early Letters L2.1). Attached are two original packets of specimens of cotton seeds. An English translation is found at Early Letters L2.2.

An excerpt was published in Philosophical Transactions, vol. 17, no. 202, dated 31 August 1693. See Publication history below.