Letter 39 of September 17, 1683 Figure G | Arcana Naturae Detecta

Very small living animals, which moved very prettily, in the white matter between the molars and teeth.

Seer kleijne levende dierkens, die seer aerdig beweegden, in witte materie tusschen de kiesen en tanden.

It was not in Gaesbeeck's first edition but it was in all the other editions that Leeuwenhoek published as well as in Philosophical Transactions.

Origin of specimen: 
Leeuwenhoek's mouth
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September 17, 1683
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