Chronology of events: 1673--1692

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 1, 1673 cousin Magdaleentje (Helena) Maertens Leeuwenhoek (1653-1720) married Johannes de Coep
April 28, 1673 Wrote Letter 1 of 1673-04-28 (AB 1) to Henry Oldenburg
May 7, 1673 The Royal Society received Leeuwenhoek's first letter
May 15, 1673 Henry Oldenburg wrote to Reinier de Graaf about the Royal Society's reception of Leeuwenhoek's first letter
May 19, 1673 At age 40, first letter published in Philosophical Transactions
August 8, 1673 mentor Constantijn Huygens wrote to Robert Hooke about Leeuwenhoek
August 15, 1673 Wrote Letter 2 of 1673-08-15 (AB 2) to Henry Oldenburg
August 21, 1673 mentor Reinier de Graaf buried
October 6, 1673 First letter's ten figures published in Philosophical Transactions
October 24, 1673 Leeuwenhoek's family members in 1673
November 8, 1673 Wrote letter of 1673-11-08 (AB 3) to Henry Oldenburg
January 1, 1674 Paid the Familiegeld (estate tax)
February 12, 1674 Constantijn Huygens wrote to Oldenburg about Leeuwenhoek and his own single-lens microscope
March 10, 1674 nieces Margrieta and Maria Jans de Molijn married Arnoldus van den Heuvel and Cornelis Haaxman
March 18, 1674 sister-in-law Maria de Meij married Pieter Schepens
April 5, 1674 Wrote letter of 1674-04-05 (AB 4) to Constantijn Huygens
April 7, 1674 Wrote Letter 3 of 1674-04-07 (AB 5) to Henry Oldenburg
April 16, 1674 Wrote letter of 1674-04-16 (AB 6) to Henry Oldenburg
April 24, 1674 Wrote letter of 1674-04-24 (AB 7) to Constantijn Huygens
April 24, 1674 Appointed curator of the abandoned estate of Bartholomeus Ritmeier
April 24, 1674 Henry Oldenburg wrote to Leeuwenhoek requesting that he examine saliva, chyle, sweat, and sperm
June 1, 1674 Wrote Letter 4 of 1674-06-01 (AB 8) to Henry Oldenburg
July 6, 1674 Wrote Letter 5 of 1674-07-06 (AB 9) to Henry Oldenburg
August 1, 1674 First observed microbes
August 5, 1674 Visited by Holger Jacobæus, the Bartholin brothers, and Arent Seyn; described as "ingenious but illiterate"
August 15, 1674 Visited by Johannes Swammerdam
August 16, 1674 Ordered as curator to hand over the debt books of Bartholomeus Ritmeier
August 20, 1674 Henry Oldenburg wrote to Leeuwenhoek encouraging him to send more observations
August 24, 1674 daughter Maria made a will
September 7, 1674 Wrote letter of 1674-09-07 (AB 10) to Henry Oldenburg
September 7, 1674 Wrote Letter 6 of 1674-09-07 (AB 11) to Henry Oldenburg
October 19, 1674 Wrote Letter 7 of 1674-10-19 (AB 12) to Henry Oldenburg
October 26, 1674 Henry Oldenburg wrote to Leeuwenhoek encouraging him and asking about the kind of salt he was observing
November 12, 1674 The Royal Society read and discussed Leeuwenhoek's letter of June 1, 1674
December 4, 1674 Wrote Letter 8 of 1674-12-04 (AB 13) to Henry Oldenburg
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 24, 1674 Henry Oldenburg wrote to Leeuwenhoek about his doubts about globules
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 20, 1675 Christiaan Huygens wrote to Henry Oldenburg doubting Leeuwenhoek's observations of globules
January 22, 1675 Wrote Letter 9 of 1675-01-22 (AB 15) to Henry Oldenburg
February 2, 1675 Henry Oldenburg wrote to Christiaan Huygens about doubting Leeuwenhoek's globules
February 11, 1675 Wrote Letter 10 of 1675-02-11 (AB 16) to Henry Oldenburg
February 19, 1675 Henry Oldenburg wrote to Leeuwenhoek in response to his letter of 1675-01-22
March 26, 1675 Wrote Letter 11 of 1675-03-26 (AB 17) to Henry Oldenburg
April 12, 1675 Henry Oldenburg wrote to Leeuwenhoek recommending that he get help from knowledgable people
August 14, 1675 Wrote Letter 12 of 1675-08-14 (AB 18) to Henry Oldenburg
August 22, 1675 Henry Oldenburg wrote to Leeuwenhoek acknowledging reciept of his letters
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
December 28, 1675 Henry Oldenburg wrote to Leeuwenhoek about the reaction in London to his observations
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 3, 1676 Henry Oldenburg wrote to Leeuwenhoek requesting that he examine hair
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 4, 1676 Henry Oldenburg wrote to Leeuwenhoek about Hooke's and Grew's reactions to recent observations
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 18, 1676 Henry Oldenburg wrote to Leeuwenhoek; sent Philosophical Transactions no. 127

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