Wrote Letter L-482 of 1711-11-23 to Anthonie Heinsius about claims by Fryer and Kircher supporting spontaneous generation, which Leeuwenhoek rejected; gold, copper, and silver dissolved in aqua fortis and the separation of gold and copper

Leeuwenhoek's self-publications are the source for the summaries of his 165 letters self-published and thus self-numbered letters. This letter was not among them.

Of the letters from L-405 1702-04-28 and L-487 1712-06-1, those letters with scientific observations, including this one, were all addressed to members of the Royal Society and almost all of them were excerpted in Philosophical Transactions.