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
November 24, 1687 nephew Johannes Adriaans Swalmius married Magdelena van Mierop
November 28, 1687 Wrote Letter 60 of 1687-11-28 (AB 105) to Members of the Royal Society
January 1, 1688 Published Vervolg der Brieven (Continuation of the Letters), Letters 53 - 60 (2nd)
April 2, 1688 printer-bookseller Hendrik van Cronevelt bought the house next door
May 25, 1688 Wrote Letter 61 of 1688-05-25 (AB 106) to Members of the Royal Society
July 6, 1688 Wrote Letter 62 of 1688-07-06 (AB 107) to Members of the Royal Society
August 3, 1688 Wrote Letter 63 of 1688-08-03 (AB 108) to Members of the Royal Society
August 24, 1688 Wrote Letter 64 of 1688-08-24 (AB 109) to Members of the Royal Society
September 7, 1688 Wrote Letter 65 of 1688-09-07 (AB 110) to Members of the Royal Society
September 23, 1688 Wrote letter of 1688-09-23 (AB 111) to Melchisedec Thevenot
November 1, 1688 Published Den Waaragtigen Omloop des Bloeds (On the True Circulation of Blood), Letter 65
January 1, 1689 Published Tweede Vervolg der Brieven (Second Continuation of the Letters), Letters 61 - 67
January 1, 1689 Published Continuatio Epistolarum (Continuation of the Letters), Letters 53-60
January 12, 1689 Wrote letter of 1689-01-12 (AB 112) to Robert Boyle
January 12, 1689 Wrote Letter 66 of 1689-01-12 (AB 113) to Members of the Royal Society
April 1, 1689 Did not write any letters between 1689 04-01 and 1691 09-18
April 1, 1689 Wrote Letter 67 of 1689-04-01 (AB 114) to Members of the Royal Society
May 27, 1689 Anthonie Heinsius became Grand Pensionary of the States of Holland
June 21, 1689 nephew Adriaan Johannes Swalmius baptized, witnessed by Antony and Cornelia
October 19, 1689 cousin Adriaen Lambrechts Leeuwenhoek married Eva Jacobs Overschie
April 3, 1690 cousin Maarten Lambrechts Leeuwenhoek married Margareta Pieters van Limburg
April 17, 1690 daughter Maria made a will
September 7, 1690 Bought the other part of the garden outside the walls of the city
January 1, 1691 Published Onsigtbare Verborgentheden (Invisible Mysteries), Letters 38, 42, 43 (2nd)
March 2, 1691 colleague Gottfried Leibniz wrote to Christiaan Huygens praising Leeuwenhoek
September 18, 1691 Wrote letter of 1691-09-18 (AB 115) to Antonio Magliabechi
November 27, 1691 Wrote Letter 68 of 1691-11-27 (AB 116) to Members of the Royal Society
December 2, 1691 mentor Cornelis 's Gravesande died
December 5, 1691 mentor Cornelis 's Gravesande buried
December 6, 1691 brother-in-law Jan Jacobs de Molijn buried
January 4, 1692 Wrote Letter 69 of 1692-01-04 (AB 117) to Members of the Royal Society
January 13, 1692 niece Geertruijt Jans de Molijn inherited property from her father Jan Jacobs
February 1, 1692 Wrote Letter 70 of 1692-02-01 (AB 118) to Members of the Royal Society
February 1, 1692 Robert Hooke called Leeuwenhoek the microscope's "single votary"
March 7, 1692 Wrote Letter 71 of 1692-03-07 (AB 119) to Members of the Royal Society
April 22, 1692 Wrote Letter 72 of 1692-04-22 (AB 120) to Richard Waller
June 24, 1692 Wrote Letter 73 of 1692-06-24 (AB 121) to Members of the Royal Society
August 12, 1692 Wrote Letter 74 of 1692-08-12 (AB 122) to Members of the Royal Society
September 16, 1692 Wrote Letter 75 of 1692-09-16 (AB 123) to Members of the Royal Society
September 23, 1692 Wrote letter of 1692-09-23 (AB 124) to Mary, Queen of Great Britain
November 29, 1692 cousin Sara Maertens Leeuwenhoek married Cornelis Luda
December 21, 1692 cousin Jacob Adriaens Leeuwenhoek (1692-1724) baptized
January 1, 1693 editor Richard Waller began publishing Leeuwenhoek again
March 25, 1693 Published Derde Vervolg der Brieven (Third Continuation of the Letters), Letters 68 - 75
April 4, 1693 Received an honorarium from the City for his books of letters
May 23, 1693 De la Croze called Leeuwenhoek a "curious Observer of Nature"
July 1, 1693 Wrote letter of 1693-07-01 (AB 125) to Richard Waller
September 18, 1693 Paul Durven appointed curator
September 26, 1693 cousin Sara Maertens Leeuwenhoek buried
October 15, 1693 Wrote Letter 76 of 1693-10-15 (AB 126) to Members of the Royal Society
October 27, 1693 Wrote letter of 1693-10-27 (AB 127) to Pieter Rabus
November 19, 1693 nephew Johannes Adriaans Swalmius buried
November 21, 1693 Appointed guardian of his dying wife Cornelia Swalmius
November 30, 1693 Hans Sloane was elected Secretary of the Royal Society and editor of Philosophical Transactions. He published 68 articles by Leeuwenhoek over the next twenty years.
December 5, 1693 Rented St. Agnieten Tooren from the city for 12 years
December 7, 1693 wife Cornelia Swalmius made a will
December 8, 1693 Wrote letter of 1693-12-08 (AB 128) to Richard Waller
December 20, 1693 Wrote Letter 77 of 1693-12-20 (AB 129) to Members of the Royal Society
December 26, 1693 wife Cornelia Swalmius made a will including Maria
December 29, 1693 Sold the garden outside the walls of the city
January 1, 1694 Published Onsigbare Geschapene Waarheden (Invisible Creation Truths), Letters 32, 39, 33
January 1, 1694 Published Vierde Vervolg der Brieven (Fourth Continuation of the Letters), Letters 76 - 83
January 6, 1694 wife Cornelia Johannes Swalmius buried
January 19, 1694 Wrote letter of 1694-01-19 (AB 130) to Richard Waller
January 24, 1694 Wrote Letter 78 of 1694-01-24 (AB 131) to Members of the Royal Society
February 12, 1694 Wrote letter of 1694-02-12 (AB 132) to Richard Waller
February 12, 1694 Presented act of guardianship to the Weeskamer after Cornelia's death
February 24, 1694 Wrote Letter 79 of 1694-02-24 (AB 133) to Members of the Royal Society
March 2, 1694 Wrote Letter 80 of 1694-03-02 (AB 134) to Members of the Royal Society
March 2, 1694 Presented Cornelia's will to the Weeskamer

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