Letter, from Antoni van Leeuwenhoek to Hans Sloane, dated at Delft Observations of the larvae of cheese-flies; experiments with cheese-flies and sulphur; treatment of toothache with vitriol Read to the Royal Society on 24 July 1700 English translation see EL/L3/20 Transcribed in JBO/10/193 Transcribed and translated in 'Alle de brieven van Antoni van Leeuwenhoek', edited, illustrated and annotated by Committee of Dutch Scientists, vol 13, p 163 English translation printed in 'Philosophical Transactions', vol 22, no 265, p 635 27 July 1700