Letter, from Antoni van Leeuwenhoek to the Royal Society, dated at Delft Signed autograph Observations of the intestines of a woman who had been hanged: an account of the various layers and fibres of the colon Read to the Royal Society on 22 May 1706 Original figures no longer exist; engraved figures for publication are attached English translation is EL/L4/4 Transcribed and translated in 'Alle de brieven van Antoni van Leeuwenhoek', edited, illustrated and annotated by Committee of Dutch Scientists, vol 15, p 299 English translation printed in 'Philosophical Transactions', vol 26, no 314, p 53 20 April 1706