Translation of a letter, from Antoni van Leeuwenhoek to the Royal Society, dated at Delft 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 Translation of EL/L2/31 1692