Letter, from Antoni van Leeuwenhoek to Henry Oldenburg, dated at Deflt Signed autograph Further observations of blood corpuscles; observations of arum leaves; concerning the sap in plants and its taste; concerning the sense of taste in regard to sugar and salt; concerning manna (from the bark of 'Fraxinus ornus') and its laxative effects; an account of digestion in humans and the effects of poison Partial translation of the account of digestion in humans see EL/L1/12 Transcribed and translated in 'Alle de brieven van Antoni van Leeuwenhoek', edited, illustrated and annotated by Committee of Dutch Scientists, part 1, p 296 For summary see 'The correspondence of Henry Oldenburg', ed and trans by A Rupert Hall & Marie Boas Hall, vol 11, p 443 English extract printed in 'Philosophical Transactions', vol 10, no 117, p 380 14 August 1675