Letter, from Antoni van Leeuwenhoek to Hans Sloane, dated at Delft Signed autograph Says that he has examined the sperm of many animals, but if there is any animal that the Royal Society would like him to investigate, he will do so Read to the Royal Society on 12 June 1700 English translation see EL/L3/16 Transcribed in JBO/10/187 Transcribed and translated in 'Alle de brieven van Antoni van Leeuwenhoek', edited, illustrated and annotated by Committee of Dutch Scientists, vol 13, p 109 14 June 1700