Wrote Letter L-217 of 1692-04-22 to Richard Waller about the construction of an air pump and experiments with different liquids, seeds and small stones in urine, a hog's hair in the skin of a child, and grains of wheat

Date: 
April 22, 1692
Standard reference information
L-number: 
L-217
Leeuwenhoek's number: 
72
Collected Letters number: 
120
Collected Letters volume: 
9

Text of the letter in the original Dutch and in English translation from Alle de Brieven. The Collected Letters at the DBNL - De Digitale Bibliotheek voor de Nederlandse Letteren

Leeuwenhoek wrote this letter about …

  • construction of an air pump and experiments with different liquids
  • finding chervil seeds, red currant seeds and small stones in three different samples of urine
  • discovery of a hog's hair in the skin of a child
  • pericarp and seed grain of wheat