Wrote Letter L-514 of 1715-01-11 to Anthonie Heinsius, a cover letter for a copy of a recent letter on muscle fibres

January 11, 1715
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Signed autograph letter. The manuscript is to be found in The Hague, Nationaal Archief, Archief Anthonie Heinsius, toegangsnr. 3.01.19, inv.nr. 1931; 1 quarto page.

Not published.

Accompanying letter to a copy of a letter on muscle fibres.

It is not clear of which letter Leeuwenhoek sent a copy to Heinsius. The first letter in which Leeuwenhoek acknowledged his new opinion about muscles was Letter L-509 of 26 October 1714 to the Royal Society. However, because of the mention of the tendons running crosswise (see note 2), it concerns probably Letter L-512 of 9 November 1714.