Wrote Letter L-474 of 1710-01-14 to the members of the Royal Society about Alexander Stuart's visit, blood circulation in eels, crystallisation of sugar, minerals from Hungary, and his new fish viewer for visitors to see blood circulating in an eel's tail

January 14, 1710
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The original manuscript on six quarto pages, written and signed by Leeuwenhoek, is preserved at the Royal Society (MS. 2084. L 4. 33). It was accompanied by five figures, the drawings of which were lost after the plates were made for publication in Philosophical Transactions.