Letter, from Antoni van Leeuwenhoek to John Chamberlayne, dated at Delft Signed autograph Observations of a sample of vitrified matter from a hay-rick which had been burnt Read to the Royal Society on 11 April 1705 English translation is EL/L3/73 Transcribed and translated in 'Alle de brieven van Antoni van Leeuwenhoek', edited, illustrated and annotated by Committee of Dutch Scientists, vol 15, p 125 English translation printed in 'Philosophical Transactions', vol 24, no 296, p 1856 3 March 1705