Letter, from Antoni van Leeuwenhoek to the Royal Society, dated at Delft Signed autograph Observations of duckweed, its roots and reproduction; observations of ciliates, vorticellids and rotifera and the budding of hydra, an asexual form of procreation, all of which are attached to duckweed Read to the Royal Society on 17 February 1702 7 red-chalk figures attached English translation see EL/L3/48 Transcribed and translated in 'Alle de brieven van Antoni van Leeuwenhoek', edited, illustrated and annotated by Committee of Dutch Scientists, vol 14, p 159 English translation printed in 'Philosophical Transactions', vol 23, no 283, p 1304 B&W negative of last page, Box N101. 25 December 1702