Letter 38 of July 16, 1683 Figure 1 | Arcana Naturae Microscopiorum

Little animals, moving and dead, both from the testicles and from the carrying-away seed vessels of the frog.

Dierkens, beweegde en doot, uijt de testicullen als afdragende zaad-vaten van de kikvors.

The scientists who edited the early volumes of Alle de Brieven / Collected Letters translated as afdragende zaad-vaten as "deferent ducts".

Origin of specimen: 
Delft, "in a road"
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July 16, 1683
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