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.

Unless otherwise indicated, for events in England, the date given is Old Style, 10 days behind the Dutch Republic's New Style until 1700 and then 11 days behind.

Date
April 20, 1677 Henry Oldenburg wrote to Leeuwenhoek relaying the compliments of the members of the Royal Society
May 14, 1677 Wrote Letter 20 of 1677-05-14 (AB 32) to Henry Oldenburg
May 18, 1677 Benedict Haan 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 7, 1677 Henry Oldenburg wrote to Leeuwenhoek; sent Philosophical Transactions no. 136
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 Robert Hooke try to replicate Leeuwenhoek's observations
October 16, 1677 Wrote letter of 1677-10-16 (AB 34) to William Brouncker
November 1, 1677 Wrote Letter 22 of 1677-11-01 (AB 35) to William Brouncker
November 1, 1677 Robert Hooke failed to demonstrate "minute animals" in pump water. The Royal Society read the testimonials from people in Delft.
November 8, 1677 Using an improved microscope, Hooke again failed
November 15, 1677 Bought land near Berkelse Meer
November 15, 1677 Robert Hooke finally succeeded in replicating Leeuwenhoek's observations of little animals
December 1, 1677 Robert Hooke wrote to Leeuwenhoek verifying his observations in pepper water
December 2, 1677 Wrote letter of 1677-12-02 (AB 36) to William Brouncker
December 6, 1677 Robert Hooke demonstrated the superiority of single-lens over double-lens microscopes
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 14, 1678 Robert Hooke read his paper about his microscopic observations and methods
March 18, 1678 Wrote Letter 24 of 1678-03-18 (AB 38) to Nehemiah Grew
April 18, 1678 Robert Hooke wrote to Leeuwenhoek that King Charles saw the little animals in pepper water
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
June 13, 1678 Christiaan Huygens wrote to Nehemiah Grew about seeing the sperm in human semen
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
October 31, 1678 Christiaan Huygens's method of melting powdered glass to make a spherical lens
November 6, 1678 daughter Maria registered as a member of the Hervormde Gemeente Delft (Reformed Church in Delft)
December 26, 1678 Wrote letter of 1678-12-26 (AB 41) to Constantijn Huygens
February 10, 1679 Appointed curator; Johannes Blaucamer guarantor
February 21, 1679 Wrote Letter 27 of 1679-02-21 (AB 42) to Nehemiah Grew
April 1, 1679 cousin Maerten Huijchs Leeuwenhoek appointed tax master
April 25, 1679 Wrote Letter 28 of 1679-04-25 (AB 43) to Nehemiah Grew
April 27, 1679 Wrote letter of 1679-04-27 (AB 44) to Constantijn Huygens
May 11, 1679 Wrote letter of 1679-05-11 (AB 45) to Lambert van Velthuysen
May 15, 1679 Wrote letter of 1679-05-15 (AB 46) to Christiaan Huygens
May 20, 1679 Wrote letter of 1679-05-20 (AB 47) to Constantijn Huygens
June 13, 1679 Wrote letter of 1679-06-13 (AB 48) to Nehemiah Grew
June 13, 1679 Wrote letter of 1679-06-13 (AB 49) to Lambert van Velthuysen
July 11, 1679 Wrote letter of 1679-07-11 (AB 50) to Lambert van Velthuysen
August 15, 1679 Appointed city inspector of imported and exported liquids / wine gauger
August 25, 1679 Called "an illiterate, but ingenious man" by Peter Pels
September 4, 1679 colleague Nicolaas van der Sloot appointed co-wine gauger
October 1, 1679 Visited by James, Duke of York, and "several high personages"
October 13, 1679 Wrote letter of 1679-10-13 (AB 51) to Robert Hooke
October 30, 1679 cousin Pieter Abrahams Hogenhouck buried
November 1, 1679 Philosophical Collections number 1 published in London; one letter by Leeuwenhoek
November 14, 1679 Wrote letter of 1679-11-14 (AB 52) to Lambert van Velthuysen
November 20, 1679 Wrote letter of 1679-11-20 (AB 53) to Robert Hooke
January 12, 1680 Wrote Letter 29 of 1680-01-12 (AB 54) to Robert Hooke
January 16, 1680 Wrote letter of 1680-01-16 (AB 55) to Robert Hooke
February 2, 1680 Robert Hooke inquired whether Leeuwenhoek would accept election to the Royal Society
February 7, 1680 microscopist Jan Swammerdam died
February 8, 1680 Elected a Fellow by the Royal Society
February 13, 1680 Wrote letter of 1680-02-13 (AB 56) to Robert Hooke
February 18, 1680 cousin Margaretha (Grietjen) Huijchs Leeuwenhoek married Gijsbert Pieterse Cruijt
February 22, 1680 Thomas Gale authorized by the Royal Society to send diploma with seal to Leeuwenhoek
March 1, 1680 The Royal Society discussed Leeuwenhoek's diploma
March 4, 1680 The Royal Society discussed a silver box for Leeuwenhoek's diploma
March 7, 1680 Thomas Gale sent Leeuwenhoek official notice of his election as member of the Royal Society
March 14, 1680 The Royal Society further discussed Leeuwenhoek's diploma
April 5, 1680 Wrote Letter 30 of 1680-04-05 (AB 57) to Robert Hooke

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