Letter, from Antoni van Leeuwenhoek to the Royal Society, dated at Delft Signed autograph Observations of liver fluke in the earth of meadows; observations of worms, rotifers, and other micro-organisms from the earth; theory about how these animals move between water and earth Read to the Royal Society on 17 November 1703 EL/L3/53 for covering letter EL/L3/55 for English translation Transcribed and translated in 'Alle de brieven van Antoni van Leeuwenhoek', edited, illustrated and annotated by Committee of Dutch Scientists, vol 14, p 251 English translation printed in 'Philosophical Transactions', vol 24, no 289, p 1522 3 November 1703