Leeuwenhoek did not publish any letters after 1718 in book form with his own summaries. The summary below comes from Alle de Brieven / Collected Letters.
In this letter, L. again discusses the osmotic phenomena through which the flesh fibers are nourished by the blood vessels, this time in fish.
The manuscript of this letter is to be found in London, Royal Society, Early Letters L.4.65, 12 quarto pages, 7 engraved figures.
A contemporary translation of this letter is found in London, Royal Society, Early Letters, L.4.66, 8 pages. According to the description on the Royal Society’s website, EL.L4.65, the letter was read during the meetings of the Royal Society on 8 March and 11 April 1721 (O.S), which must be in error; Journal Book Original, vol. 13.
Seven figures came with this letter. L. did not send drawings, but a single engraving accompanied this letter. The figures 1-7 are to be found on the plate with no. 368 of Philosophical Transactions.
