Wrote letter of 1683-05-20 (AB 71) to Anthonie Heinsius

May 20, 1683
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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 two octavo pages, written and signed by Leeuwenhoek, is preserved at the Rijksarchief (National Archive) in Den Haag (Inv. No. 13). The letter gives the impression of being part of an ongoing correspondence but it was the first of the twenty surviving letters that he wrote to Heinsius. It was not published during their lifetimes.

Leeuwenhoek wrote this letter to his old friend to recount his recent observations and give a preview of an upcoming letter to the Royal Society. He promised to send Heinsius a copy of the letter, which became Letter 38 of July 16, 1683 to Christopher Wren.