Wrote Letter L-572 of 1722-04-21 to the members of the Royal Society about the muscular fibres of different animals and whether iron becomes magnetic over time

Signed autograph letter. The manuscript is to be found in London, Royal Society, Early Letters L.4.75; 4 quarto pages.

A contemporary English translation of the letter by James Jurin is to be found in London, Royal Society, Early Letters L.4.76; 3 pages. The letter was read during the meetings of the Royal Society on 3 May and 10 May 1722; Royal Society, Journal Book Original, vol. 13, p. 193-95; Letter Book Original, 15.74.