Letter, from Antoni van Leeuwenhoek to the Royal Society, dated at Delft Signed autograph An account of the properties of the East Indian tree 'Euwane' and mixing Leeuwenhoek's blood with the crushed seed of the tree and water; the effects of a drink made from hempseed; observations of a dissected hempseed Read to the Royal Society on 24 April 1706 English translation see EL/L4/2 Transcribed and translated in 'Alle de brieven van Antoni van Leeuwenhoek', edited, illustrated and annotated by Committee of Dutch Scientists, vol 15, p 283 English translation printed in 'Philosophical Transactions', vol 25, no 305, p 2205 19 March 1706