Johannes Boogert, Robert Poitevin, and W. van der Burch wrote to the Royal Society attesting to the number of little animals in Leeuwenhoek's infusions

August 21, 1677

Three Delft citizens, Johannes Boogert, notary, Robert Poitevin, doctor, and W. van der Burch, lawyer, wrote to the Royal Society in Latin. They attested to seeing 45,000 little animals in a drop of water when they looked through Leeuwenhoek's lens.

"We have observed with our own eyes that each of the 90 parts contained more than 500 little animals."


Enclosures with letter #33. Collected Letters, vol. 2, pp 257-271.