Chronology of events:

For some events, the year is certain but the month and day are not. Example: We know only the year for the collections of Leeuwenhoek's letters published in Dutch during his lifetime. For other events, the season or month are certain but the day is not. Example: Leeuwenhoek mentions that someone visited him "last month".

On the other hand, many events did indeed happen on the first day of a month. Example: public appointments to Delft's city offices took effect on January 1 of each year. Thus:

  • A date of January 1 in a given year may indicate that the year is certain but the month and day are not.
  • A date of 1 in a given month may indicate that the year and month are certain but the day is not.
Date
December 21, 1674 Appointed to administer the affairs of sister-in-law Maria de Meij
December 22, 1674 sister-in-law Maria de Meij and Pieter Schepens granted a divorce
December 26, 1674 Wrote letter of 1674-12-26 (AB 14) to Constantijn Huygens
December 31, 1674 sister-in-law Catharina Swalmius buried
January 1, 1675 cousin Maerten Huijchs Leeuwenhoek appointed tax farmer
January 22, 1675 Wrote Letter 9 of 1675-01-22 (AB 15) to Henry Oldenburg
February 11, 1675 Wrote Letter 10 of 1675-02-11 (AB 16) to Henry Oldenburg
March 26, 1675 Wrote Letter 11 of 1675-03-26 (AB 17) to Henry Oldenburg
August 14, 1675 Wrote Letter 12 of 1675-08-14 (AB 18) to Henry Oldenburg
September 15, 1675 First observed microbes in rain water
December 15, 1675 Jan Vermeer, the painter, buried
December 20, 1675 Wrote Letter 13 of 1675-12-20 (AB 19) to Henry Oldenburg
January 22, 1676 Wrote letter of 1676-01-22 (AB 20) to Henry Oldenburg
January 26, 1676 sister-in-law Maria de Meij buried
February 22, 1676 Wrote Letter 14 of 1676-02-22 (AB 21) to Henry Oldenburg
April 5, 1676 co-worker Daniel Bogaert married Maria van Rees
April 21, 1676 Wrote Letter 15 of 1676-04-21 (AB 22) to Henry Oldenburg
April 24, 1676 Began series of experiments to observe microbes
April 26, 1676 Began Pepper 2 experiment
May 29, 1676 Wrote Letter 16 of 1676-05-29 (AB 23) to Henry Oldenburg
July 1, 1676 Visited by Christiaan Huygens during the summer; he saw the microbes in Leeuwenhoek's infusions
July 28, 1676 Wrote letter of 1676-07-28 (AB 24) to Henry Oldenburg
July 28, 1676 Wrote Letter 17 of 1676-07-28 (AB 25) to Robert Boyle
September 30, 1676 Appointed curator of estate of Catherine Bolnes, Vermeer's widow
October 9, 1676 Wrote Letter 18 of 1676-10-09 (AB 26) to Henry Oldenburg
October 23, 1676 Cornelis' s Gravesande lent money to Sijmons Decker
October 30, 1676 Wrote letter of 1676-10-30 (AB 27) to Henry Oldenburg
November 7, 1676 Wrote letter of 1676-11-07 (AB 28) to Constantijn Huygens
November 18, 1676 Visited by Gottfried Leibniz
November 25, 1676 Magistrates approved payment by Maria Thins so Leeuwenhoek could pay Vermeer's creditors
November 27, 1676 Wrote letter of 1676-11-27 (AB 29) to Henry Oldenburg
January 22, 1677 mentor Jacob Spoors buried
January 30, 1677 cousin Lambrecht Huijchs Leeuwenhoek (1624-1701) bought A0129 Buitenwatersloot 214
February 1, 1677 The Royal Society read the first part of Leeuwenhoek's long letter of the previous October 9
February 2, 1677 Recovered twenty-six paintings from Jannetje Stevens to help pay Catherine Bolnes' creditors
February 8, 1677 The Royal Society read the second part of Leeuwenhoek's long letter of October 9, 1676
February 15, 1677 Wrote letter of 1677-02-15 (AB 30) to Christiaan Huygens
February 22, 1677 The Royal Society read the third part of Leeuwenhoek's long letter of October 9, 1676.
March 12, 1677 Maria Thins filed a legal action to prevent Leeuwenhoek from selling The Art of Painting
March 15, 1677 Organized the auction of Vermeer's remaining paintings
March 23, 1677 Wrote Letter 19 of 1677-03-23 (AB 31) to Henry Oldenburg
March 25, 1677 The Royal Society published Leeuwenhoek's letter of October 9, 1676, reporting microbes in infusions
March 29, 1677 The Royal Society read Leeuwenhoek's letter of March 23, 1677
May 14, 1677 Wrote Letter 20 of 1677-05-14 (AB 32) to Henry Oldenburg
May 18, 1677 Benedict Hahn and Henry Cordes wrote to the Royal Society attesting to microbes in Leeuwenhoek's infusions
May 27, 1677 The Royal Society read Leeuwenhoek's letter of May 14, 1677
June 2, 1677 Robbert Gordon wrote to the Royal Society attesting to microbes in Leeuwenhoek's infusions
August 13, 1677 Aldert Hodenpijl wrote to the Royal Society attesting to microbes in Leeuwenhoek's infusions
August 21, 1677 Johannes Boogert, Robert Poitevin, and W. van der Burch wrote to the Royal Society attesting to microbes in Leeuwenhoek's infusions
August 30, 1677 Alex Petrie wrote to the Royal Society attesting to microbes in Leeuwenhoek's infusions
September 5, 1677 mentor Henry Oldenburg died in London
October 5, 1677 Wrote Letter 21 of 1677-10-05 (AB 33) to Henry Oldenburg
October 15, 1677 The Royal Society requested that Hooke try to replicate Leeuwenhoek's observations
October 16, 1677 Wrote letter of 1677-10-16 (AB 34) to William Brouncker
November 1, 1677 Hooke failed to demonstrate "minute animals" in pump water. The Royal Society read the testimonials from people in Delft.
November 1, 1677 Wrote Letter 22 of 1677-11-01 (AB 35) to William Brouncker
November 8, 1677 Using an improved microscope, Hooke again failed
November 15, 1677 Hooke finally succeeded
November 15, 1677 Bought land near Berkels Meer
December 2, 1677 Wrote letter of 1677-12-02 (AB 36) to William Brouncker
January 1, 1678 Robert Hooke's Lectures and Collections: Cometa, Microscopium published
January 14, 1678 Wrote Letter 23 of 1678-01-14 (AB 37) to Robert Hooke
February 1, 1678 Empowered a Gouda notary to sell Vermeer's property to help pay Catherine Bolnes's creditors
March 18, 1678 Wrote Letter 24 of 1678-03-18 (AB 38) to Nehemiah Grew
April 28, 1678 Jan Swammerdam called Leeuwenhoek "biased, and reasons in a very barbarical way"
May 9, 1678 niece Maria Jans de Molijn buried
May 31, 1678 Wrote Letter 25 of 1678-05-31 (AB 39) to Nehemiah Grew
July 4, 1678 Lambert Twent named first postmaster of Delft
September 27, 1678 Wrote Letter 26 of 1678-09-27 (AB 40) to Nehemiah Grew
October 14, 1678 sister Margrieta Philips Leeuwenhoek buried

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