Wrote Letter L-218 of 1692-06-24 to the members of the Royal Society about more experiments with his air-pump, the structure of and blood in an insect's wing, a grey owlet moth, and the wing of a very small fly

June 24, 1692
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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

Leeuwenhoek wrote this letter about …

Continuation of the experiments with the air-pump; structure of an insect's wing; blood and 'blood vessels' in an insect's wing; a grey owlet moth; the wing of a very small fly