Wrote Letter 42 of 1684-07-25 (AB 81) to Members of the Royal Society about parts of the brain of several animals, chalk stones of gout, leprosy, and the scales of eels

July 25, 1684
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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 nineteen quarto pages, written and signed by Leeuwenhoek, is preserved at the Royal Society (MS. 1901. L 1. 72). It is the first letter with scientific observations that he addressed to the members of the Royal Society in general rather than to one individual. After that, of the letters with scientific observations that he sent to the Royal Society, he sent to the member in general, though he used a variety of phrases to indicate them. Letters sent to individual members were more administrative and not intended for publication.