Wrote Letter L-499 of 1713-10-12 to Hans Sloane as a cover letter for a copy of Letter L-489 on muscle fibres of a whale and a request for new numbers of Philosophical Transactions and a list of fellows of the Society to be sent to relatives in Rotterdam

October 12, 1713
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Signed autograph letter. The manuscript is to be found in London, Royal Society, MS 2102, Early Letters L.4.51; 1 quarto page.

Not published.

Cover letter to Sloane accompanying a copy of Leeuwenhoek's Letter L-498 of 1712-12-08 (SB I) to Anthonie Heinsius on muscle fibres of a whale. Sloane had requested the copy and Leeuwenhoek complied immediately, though the dates of this sequence of letters are inconsistent, as discussed on the page about Sloane's Letter L-500 dated 1713-10-24 linked under Learn more below.

In addition, Leeuwenhoek asked Sloane to send new issues of the Philosophical Transactions and a list of fellows of the Royal Society to the widow of his nephew at Rotterdam.

On the cover Leeuwenhoek himself wrote the following address:

Aande Heer. d'Heer Hans Sloane Secretaris vande Coninklijke Societeit. In Londen.