Wrote Letter L-212 of 1691-11-27 to the members of the Royal Society about blood, chyle, and an experiment to discover the volume of water when it is cold and when it is heated
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 …
the circulation of blood in the wattle of a cock and the claws of a bat
the blood-vessels at the base of a hair from the ear of a rabbit
whether blood had air bubbles
an experiment to discover the volume of water when it is cold and when it is heated
chyle
possible pieces of tendon seen in a wound