Letter, from Antoni van Leeuwenhoek to the Royal Society, dated at Delft Signed autograph Investigating why black pepper has a sharp taste; composition of the fruit of black pepper; investigation of long pepper and white pepper and the differences between the latter and black pepper; concerning the salt of tea; investigation of leaf tea; the effects of tea on digestion; examination of Spanish fly (Cantharis) 21 original figures no longer exist; engraved figures for publication are attached English translation is EL/L2/32 Transcribed and translated in 'Alle de brieven van Antoni van Leeuwenhoek', edited, illustrated and annotated by Committee of Dutch Scientists, vol 8, p 235 1 February 1692