Wrote Letter 52 of 1686-07-10 (AB 94) to Members of the Royal Society about the growth and durability of wood felled in different seasons and countries, the annual growth rings, and how wooden barrels can be watertight

July 10, 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 twelve quarto pages, written by a copyist and signed by Leeuwenhoek, is preserved at the Royal Society (MS. 1915. L 2. 6.