Wrote Letter L-077 of 1678-12-26 to Constantijn Huygens about how son Christiaan's observations of little animals correspond to his own
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 to Constantijn Huygens about how son Christiaan's observations of microorganisms correspond to his own.
A reply to the letters of Constantijn and Christiaan Huygens, concerning the identification of animalcules observed in pepper-water by Christiaan Huygen. A description of the scales on the wings of butterflies.