Letter, from Antoni van Leeuwenhoek to Richard Waller, dated at Delft Covering letter for letter EL/L2/44 States that he sends his observations of the reproduction of a flea, in printed form, and hopes that this will be acceptable. Leeuwenhoek did not send a signed autograph Read at Royal Society on 13 December 1693 See EL/L2/44 for printed letter Transcribed and translated in 'Alle de brieven van Antoni van Leeuwenhoek', edited, illustrated and annotated by Committee of Dutch Scientists, vol 9, p 265; for background information on this letter see note 1, p 207 of the same volume 8 December 1693