Wrote Letter L-168 of 1686-01-22 to members of the Royal Society about cinnabar naturalis, gunpowder, saltpeter, and air made by gunpowder and crab's eyes

January 22, 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 12 quarto pages, written by a copyist and signed by Leeuwenhoek, is preserved at the Royal Society (MS. 1908. Early Letters L1.79). An English translation by Francis Lodwick is found at Early Letters L1.80.

An excerpt was published in Philosophical Transactions, vol. 17, no. 200, dated 31 May 1693. See Publication history below.