Wrote Letter L-186 of 1687-04-04 to the members of the Royal Society about the structure of the teeth of elephants, pigs, humans, oxen, and horses and about toothache

April 4, 1687
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 12 quarto page, written by a copyist and signed by Leeuwenhoek, along with three smaller sheets that each has an engraving, is preserved at the Royal Society (MS. 1917. Early Letters L2.8).

An English translation is found at Early Letters L2.9.