Letter, from Antoni van Leeuwenhoek to the Royal Society Sent a printed copy instead of a signed autograph Observations of a tapeworm in a human and compares this with worms found in the intestines of eels; observations of tapeworms in a variety of fish; investigation of how the tapeworm feeds; observation of salt and sand in the intestines of cod Read at the Royal Society on 4 April 1694 See EL/L2/48 for covering letter Transcribed and translated in 'Alle de brieven van Antoni van Leeuwenhoek', edited, illustrated and annotated by Committee of Dutch Scientists, vol 9, p 323 24 January 1694