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
March 18, 1682 Robert Hooke read part of Letter 35 of 1682-03-03 to himself about muscle fibers
March 20, 1682 Robert Hooke wrote to Leeuwenhoek that his observations were well received by the Royal Society
April 1, 1682 Philosophical Collections number 7 published in London, including Leeuwenhoek's Letter 36 of 1682-04-04 (AB 68) to Robert Hooke
April 4, 1682 Wrote Letter 36 of 1682-04-04 (AB 68) to Robert Hooke
April 15, 1682 Robert Hooke read his letter of 1682-03-10 and Leeuwenhoek's reply of 1682-04-04 about muscles of crabs, lobsters, and shrimp
April 22, 1682 Robert Hooke showed the Royal Society part of a flesh muscle in a microscope, but the rimples mentioned by Leeuwenhoek could not be seen
July 28, 1682 Wrote letter of 1682-07-28 (AB 69) to Robert Hooke
November 19, 1682 Sold two bonds from the property of Willem Bolnes to help pay Catherina Bolnes' creditors
January 1, 1683 Visited by Marie-Anne Mancini, Duchess of Bouillon and others
January 22, 1683 Wrote Letter 37 of 1683-01-22 (AB 70) to Christopher Wren about the function of the ovary, muscles of insects, drinking tea and mild beer, erythrocytes, and a theory on the formation of blood
February 8, 1683 Received assistant wine gauger for emergencies
February 16, 1683 Francis Aston wrote to Leeuwenhoek; invited him to investigate colors
February 17, 1683 The Royal Society read Letter 37 of 1683-01-22 to Christopher Wren
March 17, 1683 Francis Aston wrote to Leeuwenhoek about new Royal Society officers
May 20, 1683 Wrote letter of 1683-05-20 (AB 71) to Anthonie Heinsius
July 16, 1683 Wrote Letter 38 of 1683-07-16 (AB 72) to Christopher Wren
July 22, 1683 Wrote letter of 1683-07-22 (AB 73) to Anthonie Heinsius
July 28, 1683 The Royal Society read Letter 38 of 1683-07-16 (AB 72) to Christopher Wren
August 4, 1683 The Royal Society discussed Letter 38 of 1683-07-16 (AB 72) to Christopher Wren about the male seed in egg yolks
September 2, 1683 Wrote letter of 1683-09-02 (AB 74) to Anthonie Heinsius
September 10, 1683 Anthonie Heinsius wrote to Leeuwenhoek about recent observations of generation
September 16, 1683 Wrote letter of 1683-09-16 (AB 75) to Anthonie Heinsius
September 17, 1683 Wrote Letter 39 of 1683-09-17 (AB 76) to Francis Aston about saliva and bacteria in tartar, nasal hairs and blackheads, skin, fish scales, pores, and calluses
September 30, 1683 Wrote letter of 1683-09-30 (AB 77) to Anthonie Heinsius
October 1, 1683 Francis Aston wrote to Leeuwenhoek about the translation of a Dutch phrase
October 14, 1683 Wrote letter of 1683-10-14 (AB 78) to Anthonie Heinsius
November 3, 1683 The Royal Society read and discussed Letter 39 of 1683-09-17 to Francis Aston
November 10, 1683 The Royal Society discussed Leeuwenhoek's observations about pores in the skin
December 28, 1683 Wrote Letter 40 of 1683-12-28 (AB 79) to Francis Aston
January 1, 1684 Published Schobbens in de Mond (Scales in the Mouth), Letter 40
January 1, 1684 Published Eyerstok (Ovary), Letters 37, 39
January 1, 1684 Published Eyerstok (Ovary), Letter 37
January 1, 1684 Published Humor Cristallinus (Crystalline Humor), Letter 41
January 1, 1684 Daniel Gaesbeeck wrote to Leeuwenhoek about why he was publishing his letters
January 1, 1684 Published Onsigtbare Geschapene Waarheden (Invisible Creation Truths), Letters 32, 33
January 1, 1684 Published Onsigtbare Geschapene Waarheden (Invisible Creation Truths), Letters 32, 39
January 1, 1684 Published Onsigtbare Geschapene Waarheden (Invisible Creation Truths), Letters 32, 33, 39
January 6, 1684 Authorized as curator to inspect estate of Willemtie Pieters Touw by her heir
February 23, 1684 The Royal Society read Letter 40 of 1683-12-28 to Francis Aston
February 26, 1684 Francis Aston wrote to Leeuwenhoek about the importance of his work
April 2, 1684 cousin Margrieta Maertens Leeuwenhoek married Michiel Reijniers van Hasseld
April 14, 1684 Wrote Letter 41 of 1684-04-14 (AB 80) to Francis Aston about lenses and corneas, the function of eye-lids, the involuntariness of blinking, the optic nerve, and the skin of Moors
May 24, 1684 The Royal Society read first part of Letter 41 of 1684-04-14 to Francis Aston the crystalline humour of the eye
May 26, 1684 William Molyneux demonstrated blood flow in a newt
May 31, 1684 The Royal Society discussed Leeuwenhoek's observations about the crystalline humour of the eye
June 14, 1684 The Royal Society read the latter part of Letter 41 of 1684-04-14 to Francis Aston
June 15, 1684 Visited Christiaan Huygens in Den Haag with the Durven brothers
July 25, 1684 Wrote Letter 42 of 1684-07-25 (AB 81) to Members of the Royal Society about parts of the brain of several animals, chalk stones of gout, leprosy, and the scales of eels
July 27, 1684 Christiaan Huygens gossiped about Maria Duyst in a letter to his brother Constantijn Huygens
December 13, 1684 sister Catharina Philips Leeuwenhoek received legacy from great uncle Johan Sebastiaans van den Berch
December 13, 1684 The Royal Society read the first part of Letter 42 of 1684-07-25 to Members of the Royal Society
December 20, 1684 cousin Geertruijt Huijchs Leeuwenhoek buried
January 1, 1685 Published Onsigtbare Verborgentheden (Invisible Mysteries), Letters 38, 42, 43
January 1, 1685 Published Zaden van Boomen (Seeds of Trees), Letters 46, 47
January 1, 1685 Published Sout-figuren (Salt figures), Letters 44, 45
January 1, 1685 Published Anatomia et Contemplatio (Anatomy and Contemplation), Letters 43, 42, 38
January 1, 1685 cousin Maerten Huijchs Leeuwenhoek appointed tax farmer
January 5, 1685 Wrote Letter 43 of 1685-01-05 (AB 82) to Members of the Royal Society
January 17, 1685 The Royal Society read the latter part of Letter 42 of 1684-07-25
January 23, 1685 Wrote Letter 44 of 1685-01-23 (AB 83) to Members of the Royal Society
January 31, 1685 The Royal Society read the former part of Letter 43 of 1685-01-05 about salts in vinegar and wine
February 7, 1685 The Royal Society read and discussed the latter part of Letter 43 of 1685-01-05
February 13, 1685 Visited by Thomas Molyneux on behalf of the Royal Society
February 23, 1685 At age 52, his 25th article in Philosophical Transactions
March 30, 1685 Wrote Letter 45 of 1685-03-30 (AB 84) to Members of the Royal Society
April 4, 1685 The Royal Society read the former part of Letter 44 of 1685-01-23 about salts in wormwood, alum, and other substances
April 20, 1685 At age 52, his 25th letter in Philosophical Transactions
May 9, 1685 The Royal Society read part of Letter 44 of 1685-01-23 about oil of tartar, potash, and camphor
May 16, 1685 The Royal Society read the latter part of Letter 44 of 1685-01-23 about salts in ashes, lime, soda, and sal armoniac
May 28, 1685 The Dublin Philosophical Society asked the Royal Society for a copy of Letter 44 of 1685-01-23 on salts of wine and vinegar
May 31, 1685 Maria Duyst van Voorhout married Frederik Adriaan van Reede van Renswoude
June 20, 1685 The Royal Society read part of Letter 45 of 1685-03-30 about the role of eggs and male sperm in a female dog
June 22, 1685 Visited by John Locke
June 27, 1685 The Royal Society read the latter part of Letter 45 of 1685-03-30 about sperm and eggs in sheep and rabbits
July 2, 1685 sister Catharina Leeuwenhoek appointed as tax collector for three years
July 11, 1685 cousin Adriaen Lambrechts Leeuwenhoek appointed curator
July 13, 1685 Wrote Letter 46 of 1685-07-13 (AB 85) to members of the Royal Society about reproduction of trees, transfer of nutrients, male and female trees, hazelnut, comparing reproduction of mammals with reproduction of plants, cross-breeding, and germination
July 24, 1685 Anthonie Heinsius wrote to Leeuwenhoek about Robert Boyle's request for an examination of cochineal
August 10, 1685 Wrote letter of 1685-08-10 (AB 86) to Anthonie Heinsius
August 21, 1685 Anthonie Heinsius wrote to Leeuwenhoek about Robert Boyle's reaction to the letter about cochineal
August 27, 1685 editor Edmond Halley did not publish any letters by Leeuwenhoek in Philosophical Transactions from 1685 to 1693
September 21, 1685 Wrote letter of 1685-09-21 (AB 87) to Anthonie Heinsius
October 1, 1685 Visited by Karl von Hessen-Kassel and Willem Meester
October 12, 1685 Wrote Letter 47 of 1685-10-12 (AB 88) to Members of the Royal Society about the beginning of plants in seeds; chyle, sweat, about skin, optic nerve, and bile of fish; salts in beer vinegar and lemon juice; and spirits mixed with blood and wine vinegar
November 5, 1685 Constantijn Huygens Jr. wrote to his brother Christiaan about Leeuwenhoek's character
November 14, 1685 The Royal Society read and discussed Letter 46 of 1685-07-13 about reproduction of trees, comparison of reproduction of mammals with the reproduction of plants, and cross-breeding
December 1, 1685 Visited by De Saingermain, who later called Leeuwenhoek a "Magus"
December 17, 1685 Constantijn Huygens wrote to Leeuwenhoek about root trees
December 25, 1685 cousin Elisabeth Maertens Leeuwenhoek married Dirck van Schie
January 1, 1686 Published Cinnaber Naturalis (Natural Cinnabar), Letters 48 - 52
January 1, 1686 Published Levende Dierkens (Living Animals), Letters 28 - 31, 34 - 36
January 1, 1686 Sat for his oil portrait by artist Johannes Verkolje (1650-1693)
January 22, 1686 Wrote Letter 48 of 1686-01-22 (AB 89) to Members of the Royal Society
January 23, 1686 The Royal Society read part of Letter 47 of 1685-10-12 about embryo plants in cotton seeds
February 6, 1686 The Royal Society elected Edmond Halley as clerk
March 2, 1686 Edmond Halley wrote a letter to Leeuwenhoek reviewing his recent "ingenious and curious communications"
March 12, 1686 Thomas Gale replied for the Royal Society about objections to an earlier letter
March 13, 1686 The Royal Society read part of Letter 47 of 1685-10-12 about chyle, sweat, pores of the skin, the crystalline humour of the eye, and the optic nerve
March 16, 1686 Antonio Magliabechi wrote to Leeuwenhoek, a "most courteous and agreeable letter"
March 20, 1686 The Royal Society read part of Letter 47 of 1685-10-12 about gall and the scales and slime of fish
March 27, 1686 The Royal Society ordered that the unread part of Letter 47 of 1685-10-12 be read at the next meeting
April 2, 1686 Wrote Letter 49 of 1686-04-02 (AB 90) to Members of the Royal Society about the structure of bone, the bark of trees, skin and scales, the moisture evaporating from his body, and a little peeling piece of skin
April 3, 1686 The Royal Society asked Francis Lodwick to translate Letter 48 of 1686-01-22 about cinnebar and gunpowder
April 10, 1686 The Royal Society read and discussed Letter 48 of 1686-01-22 about cinnebar and gunpowder
April 14, 1686 Wrote letter of 1686-04-14 (AB 91) to Antonio Magliabechi
April 24, 1686 The Royal Society ordered that Letter 49 of 1686-04-02 be translated
May 1, 1686 The Royal Society read part of Letter 48 of 1686-01-22 about the particles composing cinnabar
May 8, 1686 The Royal Society read another part of Letter 48 of 1686-01-22 about gunpowder explosions and cannon lengths
May 14, 1686 Wrote Letter 50 of 1686-05-14 (AB 92) to Members of the Royal Society about gall-nuts found on oak trees and the germination of plants
May 22, 1686 The Royal Society read part of Letter 90 [49] of 2 April 1686
May 25, 1686 Edmond Halley wrote a letter to Leeuwenhoek about a gift from the Royal Society and requesting some portraits
May 29, 1686 The Royal Society decided to send a gift to Leeuwenhoek
June 5, 1686 The Royal Society read part of Letter 49 of 1686-04-02 about bone and wood
June 8, 1686 Bought a burial section in the Oude Kerk
June 10, 1686 Wrote Letter 51 of 1686-06-10 (AB 93) to Members of the Royal Society about seeds of cotton, kapok, Bupariti, and coconuts, the reproduction of shrimp and lobster, and the eggs of shell fish
June 26, 1686 The Royal Society officers declared their satisfaction with election of Edmond Halley
July 10, 1686 The Royal Society read part of Letter 51 of 1686-06-10 about how the leaves, root, and stem are wrapped up with the seeds
July 10, 1686 Wrote Letter 52 of 1686-07-10 (AB 94) to Members of the Royal Society about the growth and durability of wood felled in different seasons and countries, the annual growth rings, and how wooden barrels can be watertight
July 11, 1686 Jacob Gronovius wrote to Leeuwenhoek about how his letters were received in Italy
July 17, 1686 The Royal Society ordered that Letter 52 of 1686-07-10 be translated
September 7, 1686 Examined silkworm eggs
September 10, 1686 Wrote letter of 1686-09-10 (AB 95) to Daniël Papenbroek
October 30, 1686 Wrote letter of 1686-10-30 (AB 96) to Antonio Magliabechi
November 5, 1686 Visited by Jacob Gronovius
January 1, 1687 cousin Maarten Pieters Hogenhouck (1650-1720) appointed to Veertigraad, served 1687-1720
January 1, 1687 Published Vervolg der Brieven (Continuation of the Letters), Letters 53 - 60
January 1, 1687 Published Anatomia Seu Interiora Rerum (Interior Anatomy), Letters 43, 42, 38
January 1, 1687 Published Anatomia Seu Interiora Rerum (Interior Anatomy), 19 Letters from 28 - 52
January 11, 1687 cousin Magdaleentje (Helena) Maertens Leeuwenhoek married Barent van Frijtom
March 1, 1687 Wrote letter of 1687-03-01 (AB 97) to James II, King of England
March 28, 1687 mentor Constantijn Huygens died
April 4, 1687 Wrote Letter 53 of 1687-04-04 (AB 98) to Members of the Royal Society about the structure of the teeth of elephant, pig, humans, ox, and horse and about toothache
April 5, 1687 Guarantor for Johan Francisco de Raet when he became a citizen of Delft
April 16, 1687 The Royal Society ordered that Letter 53 of 1687-04-04 be translated
April 23, 1687 The Royal Society read part of Letter 53 of 1687-04-04 about the structure of teeth
May 7, 1687 The Royal Society read the latter part of Letter 53 of 1687-04-04 about the teeth of various animals
May 9, 1687 Wrote Letter 54 of 1687-05-09 (AB 99) to Members of the Royal Society about the structure of 'stone' of the medlar and the coffee bean and acid in plants
May 14, 1687 The Royal Society read and discussed part of Letter 54 of 1687-05-09 about embryo plants in seeds
June 4, 1687 The Royal Society read and discussed part of Letter 54 of 1687-05-09 about coffee
June 11, 1687 cousin Adriaen Lambrechts Leeuwenhoek admitted as notary

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