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 L-001 of 1673-04-28 to Henry Oldenburg about mould and a bee's stinger and eye
May 17, 1673 The Royal Society received Leeuwenhoek's first letter
May 19, 1673 At age 40, first letter published in Philosophical Transactions
May 25, 1673 Henry Oldenburg wrote to Reinier de Graaf about the Royal Society's reception of Leeuwenhoek's first letter
August 8, 1673 mentor Constantijn Huygens wrote to Robert Hooke about Leeuwenhoek as "exceedingly curious and industrious"
August 15, 1673 Wrote Letter L-002 of 1673-08-15 to Henry Oldenburg about the bee, the movement of liquids in wood and food in a louse, and the composition of air
August 21, 1673 mentor Reinier de Graaf buried
October 16, 1673 First letter's ten figures published in Philosophical Transactions
October 24, 1673 Leeuwenhoek's family members in 1673
November 8, 1673 Wrote Letter L-003 of 1673-11-08 to Henry Oldenburg about globules in milk and in blood and his theory on the structure and growth of hair and of tumours
November 28, 1673 Named as administrator of the estate of Willem Jans Croonenburgh
January 1, 1674 Paid the Familiegeld (estate tax)
February 1, 1674 Constantijn Huygens wrote Letter L-004 to Leeuwenhoek, enclosing an extract of a letter from Oldenburg that asked Huygens to encourage L.’s nature study
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 L-005 of 1674-04-05 to Constantijn Huygens about globules in milk and blood and the growth of hair; first mention of red blood corpuscles
April 7, 1674 Wrote Letter L-006 of 1674-04-07 to Henry Oldenburg about globules in milk and blood, the growth of hair and nails, and the anatomy of a louse
April 11, 1674 Constantijn Huygens wrote Letter L-007 to Leeuwenhoek about sending his observations to son Christiaan in Paris
April 16, 1674 Wrote Letter L-008 of 1674-04-16 to Henry Oldenburg about the delivery of his letters and asking Oldenburg to befriend van Conincxbrugh
April 24, 1674 Appointed curator of the abandoned estate of Bartholomeus Ritmeier
April 24, 1674 Wrote Letter L-009 of 1674-04-24 to Constantijn Huygens about his further observations about blood, bones, teeth, and salt
May 4, 1674 Henry Oldenburg wrote Letter L-010 to Leeuwenhoek requesting that he examine saliva, chyle, sweat, and sperm
June 1, 1674 Wrote Letter L-011 of 1674-06-01 to Henry Oldenburg about movement of liquid in capillary tubes, structure of body parts, growth of skin, and the size of red blood cells
July 6, 1674 Wrote Letter L-012 of 1674-07-06 to Henry Oldenburg bout sweat, hair, fat, tears, and improved capillary tubes
August 1, 1674 First observed little animals in water
August 11, 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 24, 1674 daughter Maria made a will
August 30, 1674 Henry Oldenburg wrote Letter L-013 to Leeuwenhoek, encouraging him to send more observations
September 7, 1674 Wrote Letter L-014 of 1674-09-07 to Henry Oldenburg, stating that he will send further observations
September 7, 1674 Wrote Letter L-015 of 1674-09-07 to Henry Oldenburg about the anatomy of the eye and optic nerve of a cow, minerals eg. salt, clay, English and Flemish earth; first mention of protozoa in stagnant water
October 19, 1674 Wrote Letter L-016 of 1674-10-19 to Henry Oldenburg about eggs in the bile of cow, sheep, rabbits and poultry, the structure of metals, skin, and the bladder, and theories about the sense of taste.
October 25, 1674 The Royal Society began requiring an oath of secrecy from the members who attended meetings
November 5, 1674 Henry Oldenburg wrote Letter L-017 to Leeuwenhoek encouraging him and asking about the kind of salt he was observing
November 22, 1674 The Royal Society asked Olderburg to produce Leeuwenhoek's Letter L-011 of 1 June 1674
December 4, 1674 Wrote Letter L-018 of 1674-12-04 to Henry Oldenburg about optic nerves and sight; enclosed specimen of cow's optic nerve
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 L-019 of 1674-12-26 to Constantijn Huygens, enclosing a drawing of the optic nerve and excerpts from two recent letters
December 31, 1674 sister-in-law Catharina Swalmius buried
January 1, 1675 cousin Maerten Huijchs Leeuwenhoek appointed tax farmer
January 3, 1675 Henry Oldenburg wrote Letter L-020 to Leeuwenhoek about his doubts about globules
January 20, 1675 Christiaan Huygens wrote to Henry Oldenburg doubting Leeuwenhoek's observations of globules
January 22, 1675 Wrote Letter L-021 of 1675-01-22 to Henry Oldenburg about a new technique for observing blood and sectioned brain tissue; optic nerve, smoke, gunpowder, and scorpions
February 11, 1675 Wrote Letter L-022 of 1675-02-11 to Henry Oldenburg about crystals, vinegar, soap, spices, cod, louse, and oak leaf.
February 12, 1675 Henry Oldenburg wrote to Christiaan Huygens about doubting Leeuwenhoek's globules
March 1, 1675 Henry Oldenburg wrote Letter L-023 to Leeuwenhoek in response to his Letter L-021 of 1675-01-22
March 26, 1675 Wrote Letter L-024 of 1675-03-26 to Henry Oldenburg about meals, seeds, and pearls; transparency; movement of fluids in plants and animals
April 22, 1675 Henry Oldenburg wrote Letter L-025 to Leeuwenhoek recommending that he get help from knowledgable people
August 14, 1675 Wrote Letter L-026 of 1675-08-14 to Henry Oldenburg about blood, taste of saps, sugar, and salt, and the mechanics of taste and digestion
August 22, 1675 Henry Oldenburg wrote Letter L-027 to Leeuwenhoek acknowledging reciept of his letters
September 15, 1675 First observed little animals in rain water
December 15, 1675 Jan Vermeer, the painter, buried
December 20, 1675 Wrote Letter L-028 of 1675-12-20 to Henry Oldenburg about various omissions in previous letters, small animals in water, his theory of “globules”, and the aerometer he devised
January 1, 1676 Wrote Letter L-029 of some time in 1676 to Theodore Craanen about gold and mercury
January 7, 1676 Henry Oldenburg wrote Letter L-030 to Leeuwenhoek about the reaction in London to his observations
January 22, 1676 Wrote Letter L-031 of 1676-01-22 to Henry Oldenburg about forwarding his mail and about sending his observations of little animals in water
January 26, 1676 sister-in-law Maria de Meij buried
February 13, 1676 Henry Oldenburg wrote Letter L-032 to Leeuwenhoek requesting that he examine hair
February 20, 1676 Henry Oldenburg wrote Letter L-033 to Leeuwenhoek and pre-paid the postage
February 22, 1676 Wrote Letter L-034 of 1676-02-22 to Henry Oldenburg about hair, cow skin, horn, and bone, inviting Hooke's response
April 5, 1676 co-worker Daniel Bogaert married Maria van Rees
April 21, 1676 Wrote Letter L-035 of 1676-04-21 to Henry Oldenburg about movement of liquid in ash and other trees, little animals in wine, and cinnamon and taste
April 24, 1676 Began series of experiments to observe little animals in spice infusions
April 26, 1676 Began Pepper 2 experiment
May 1, 1676 Constantijn Huygens wrote to Oldenburg that Leeuwenhoek gave him an issue of Philosophical Transactions
May 14, 1676 Henry Oldenburg wrote Letter L-036 to Leeuwenhoek about Hooke's and Grew's reactions to recent observations
May 29, 1676 Wrote Letter L-037 of 1676-05-29 to Henry Oldenburg about disagreements with Grew about the structure of wood and a further account of the vessels, fibres, and medullary rays of wood
July 1, 1676 Visited by Christiaan Huygens during the summer; he saw the little animals in Leeuwenhoek's infusions
July 28, 1676 Wrote Letter L-038 of 1676-07-28 to Henry Oldenburg; now lost
July 28, 1676 Wrote Letter L-039 of 1676-07-28 to Robert Boyle about the effects of air on ammonia and copper
September 30, 1676 Appointed curator of estate of Catherine Bolnes, Vermeer's widow
October 9, 1676 Wrote Letter L-040 of 1676-10-09 to Henry Oldenburg about microorganisms in various waters and spice infusions, the relationship of their shape to taste, and whether there were microorganisms in the air
October 18, 1676 Henry Oldenburg wrote Letter L-041 to Leeuwenhoek; sent Philosophical Transactions no. 127
October 23, 1676 mentor Cornelis 's Gravesande lent money to Sijmons Decker
October 26, 1676 Henry Oldenburg wrote Letter L-042 to Leeuwenhoek acknowledging receipt of the letter of 1676-10-09
October 30, 1676 Wrote Letter L-043 of 1676-10-30 to Henry Oldenburg about his discussions with Grew and Boyle as well as the unreliability of the postal system
October 31, 1676 Constantijn Huygens wrote Letter L-044 to Leeuwenhoek about his son Christiaan's translating Letter L-040
November 7, 1676 Wrote Letter L-045 of 1676-11-07 to Constantijn Huygens summarizing the observations of little animals in Letter L-040
November 12, 1676 Henry Oldenburg wrote Letter L-046 to Leeuwenhoek that he would write at greater length soon
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 L-047 of 1676-11-27 to Henry Oldenburg, now lost
January 1, 1677 Theodore Craanen wrote Letter L-048 to Leeuwenhoek, some time in 1677, requesting that his relative Johan Ham be allowed to visit
January 1, 1677 Wrote Letter L-049 of some time in 1677 to Robert Boyle, now lost
January 22, 1677 mentor Jacob Spoors buried
January 26, 1677 Constantijn Huygens wrote to Oldenburg about Leeuwenhoek, a "painstaking man" who should be "cherished"
January 30, 1677 cousin Lambrecht Huijchs Leeuwenhoek (1624-1701) bought Buitenwatersloot 214
February 2, 1677 Recovered twenty-six paintings from Jannetje Stevens to help pay Catherine Bolnes' creditors
February 9, 1677 Christiaan Huygens wrote Letter L-050 of 1677-02-09 to Leeuwenhoek that his observations of little animals in spice infusions were well received in France
February 11, 1677 The Royal Society read the first part of Leeuwenhoek's long Letter L-040 of the previous 9 October about little animals in various waters
February 15, 1677 Wrote Letter L-051 of 1677-02-15 to Christiaan Huygens to thank him for translating a letter into French
February 18, 1677 The Royal Society read the second part of Leeuwenhoek's long letter of 9 October 1676
February 22, 1677 Henry Oldenburg wrote Letter L-052 to Leeuwenhoek for more details about his method for observing little animals
March 4, 1677 Henry Oldenburg wrote Letter L-053 to Leeuwenhoek requesting that he examine muscle fibers and brains
March 8, 1677 Named quartermaster of the 2nd quarter
March 8, 1677 The Royal Society read the third part of Leeuwenhoek's long letter of 9 October 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 L-054 of 1677-03-23 to Henry Oldenburg about the quantity of little creatures in one drop of water
March 25, 1677 The Royal Society published Michael Butterfield's letter about melting glass to make spherical lenses
March 25, 1677 The Royal Society published part of Leeuwenhoek's Letter L-040 of 9 October 1676 reporting little animals in infusions
April 15, 1677 The Royal Society read Leeuwenhoek's Letter L-054 of 23 March 1677 and assigned Grew to replicate his results
April 20, 1677 Henry Oldenburg wrote Letter L-055 to Leeuwenhoek relaying the compliments of the members of the Royal Society
May 14, 1677 Wrote Letter L-056 of 1677-05-14 to Henry Oldenburg about muscles, blood, the movement of fluids in fruit, moxa, and cotton
May 18, 1677 Benedict Haan and Henry Cordes wrote to the Royal Society attesting to the number of little animals in Leeuwenhoek's infusions
May 27, 1677 The Royal Society read Leeuwenhoek's Letter L-056 of 14 May 1677
June 2, 1677 Robbert Gordon wrote to the Royal Society attesting to the number of little animals in Leeuwenhoek's infusions
August 7, 1677 Henry Oldenburg wrote Letter L-057 to Leeuwenhoek, asking him to examine the skin of Moors and enclosing Philosophical Transactions no. 136
August 13, 1677 Aldert Hodenpijl wrote to the Royal Society attesting to the number of little animals in Leeuwenhoek's infusions
August 21, 1677 Johannes Boogert, Robert Poitevin, and W. van der Burch wrote to the Royal Society attesting to the number of little animals in Leeuwenhoek's infusions
August 30, 1677 Alex Petrie wrote to the Royal Society attesting to the number of little animals in Leeuwenhoek's infusions
September 5, 1677 mentor Henry Oldenburg died in London
September 11, 1677 Visited by Hennig Brand, the Hamburg merchant who discovered phosphorus
October 5, 1677 Wrote Letter L-058 of 1677-10-05 to Henry Oldenburg about skin, eels, fleas, and measuring and counting the little animals
October 15, 1677 The Royal Society requested that Robert Hooke try to replicate Leeuwenhoek's observations
October 16, 1677 Wrote Letter L-059 of 1677-10-16 to William Brouncker; he is sending some observations and a Latin translation
November 9, 1677 Wrote Letter L-060 of 1677-11-09 to William Brouncker about sperm and their movements in fresh human semen
November 11, 1677 Robert Hooke failed to demonstrate "minute animals" in pump water. The Royal Society read the testimonials from people in Delft.
November 15, 1677 Bought land near Berkelse Meer
November 18, 1677 Robert Hooke again failed, using an improved microscope
November 25, 1677 Robert Hooke finally succeeded in replicating Leeuwenhoek's observations of little animals
December 2, 1677 Wrote Letter L-061 of 1677-12-02 to William Brouncker
December 8, 1677 Constantijn Huygens wrote Letter L-062 to Leeuwenhoek about his observations of sperm
December 10, 1677 Robert Hooke wrote Letter L-063 to Leeuwenhoek to acknowledge the receipt of Letter L-060 of November 1677 to describing sperm in human semen
December 16, 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 1, 1678 Wrote Letter L-064 of some time in 1678 to Robert Boyle; now lost
January 11, 1678 Nehemiah Grew and Robert Hooke wrote Letter L-065 to Leeuwenhoek asking him to further observe sperm
January 11, 1678 Nehemiah Grew wrote Letter L-066 of 1678-01-11 to Leeuwenhoek about comparisons of the size and shape of sperm from a variety of animals, the role of sperm in reproduction, and vessels in semen
January 14, 1678 Wrote Letter L-067 of 1678-01-14 to Robert Hooke about human blood, blood transfusions, flea larvae, and little animals in pepper water
January 27, 1678 Robert Hooke read Letter L-067 of 1678-01-14 at a meeting of the Royal Society
February 1, 1678 Empowered a Gouda notary to sell Vermeer's property to help pay Catherine Bolnes's creditors
February 3, 1678 Robert Hooke produced two experiments on blood and milk and read the latter part of the Letter L-067 of 1678-01-14 about phlegm and little animals in pepper water
February 11, 1678 Robert Hooke wrote Letter L-068 to Leeuwenhoek about how he verified Leeuwenhoek’s observations of little animals in a pepper infusion
February 14, 1678 Wrote Letter L-069 to Joseph Williamson, as Grew had requested
February 28, 1678 Christiaan Huygens began a series of observations of little animals replicating and expanding on Leeuwenhoek's
March 14, 1678 Christiaan Huygens observed little animals using dark-ground illumination
March 17, 1678 Robert Hooke showed the Royal Society microscopical observations of tendons and little animals in anise and coffee
March 18, 1678 Wrote Letter L-070 of 1678-03-18 to Nehemiah Grew about sperm in other animals and what Harvey and de Graaf got wrong about reproduction
March 24, 1678 Robert Hooke read his paper about his microscopic observations and methods
April 7, 1678 Robert Hooke showed the Royal Society microscopical observations of muscle from a lobster's claw
April 20, 1678 Nehemiah Grew wrote Letter L-071 of 1678-04-20 to Leeuwenhoek about his criticisms of Leeuwenhoek's work
April 28, 1678 Johannes Swammerdam wrote to Melchisedec Thévenot, saying that Leeuwenhoek "is biased, and reasons in a very barbarical way"
April 28, 1678 Robert Hooke wrote Letter L-072 to Leeuwenhoek that King Charles saw the little animals in pepper water
May 5, 1678 Robert Hooke showed the Royal Society microscopical observations of the motion and composition of muscles
May 9, 1678 niece Maria Jans de Molijn buried
May 31, 1678 Wrote Letter L-073 of 1678-05-31 to Nehemiah Grew about teeth, bone, hair, and sperm and what de Graaf got wrong about ovulation
June 6, 1678 Christiaan Huygens wrote to Nehemiah Grew about seeing the sperm in human semen
June 11, 1678 Christiaan Huygens observed little animals in water that Leeuwenhoek had sent to him
July 4, 1678 Lambert Twent named first postmaster of Delft
September 17, 1678 Christiaan Huygens again observed little animals using dark-ground illumination
September 27, 1678 Wrote Letter L-074 of 1678-09-27 to Nehemiah Grew about sweat and globules in saliva and blood
October 13, 1678 Nehemiah Grew wrote Letter L-075 of 1678-10-13 to Leeuwenhoek that Letter L-073 about male sperm and female ovulation in humans would be printed "as far as decency permits"
October 14, 1678 sister Margrieta Philips Leeuwenhoek buried
November 6, 1678 daughter Maria registered as a member of the Hervormde Gemeente Delft (Reformed Church in Delft)
November 10, 1678 Christiaan Huygens's method of melting powdered glass to make a spherical lens
December 23, 1678 Constantijn Huygens wrote Letter L-076 to Leeuwenhoek about the identification of little animals observed in pepper-water by his son Christiaan as well as the latter’s description of the scales on the wings of butterflies
December 26, 1678 Wrote Letter L-077 of 1678-12-26 to Constantijn Huygens about how son Christiaan's observations of little animals correspond to his own
January 25, 1679 Authorized to administer the estate of Ernst Gerrits de Bruijn
February 10, 1679 Appointed curator; Johannes Blaucamer guarantor
February 21, 1679 Wrote Letter L-078 of 1679-02-21 to Nehemiah Grew about cod sperm and about not finding any little animals in blood or saliva
April 1, 1679 cousin Maerten Huijchs Leeuwenhoek appointed tax master
April 12, 1679 Lambert van Velthuysen wrote Letter L-079 to Leeuwenhoek about arteries and nerves
April 25, 1679 Wrote Letter L-080 of 1679-04-25 to Nehemiah Grew about living little animals in fish, hare, and dogs and his calculation that more than ten times as many living animals come from the milt of a cod as there are people living on the Earth
April 27, 1679 Wrote Letter L-081 of 1679-04-27 to Constantijn Huygens about the number of sperm in the milt of the cod
May 1, 1679 Visited by James, Duke of York, and "several high personages"
May 4, 1679 Constantijn Huygens wrote Letter L-082 to Leeuwenhoek that his son Christiaan’s new book Dioptrica is about to be published
May 4, 1679 mentor Constantijn Huygens, writing to his son Christiaan, called Leeuwenhoek the "magician of Delft"
May 11, 1679 Wrote Letter L-083 of 1679-05-11 to Lambert van Velthuysen about people with gout
May 15, 1679 Wrote Letter L-084 of 1679-05-15 to Christiaan Huygens to explain more about his observations of little animals
May 20, 1679 Wrote Letter L-085 of 1679-05-20 to Constantijn Huygens about the number and size of the little animals he was observing
June 1, 1679 Lambert van Velthuysen wrote Letter L-086 to Leeuwenhoek about the chalky discharges from gouty skin and his well-known controversy with the conservative supporters of the House of Orange
June 13, 1679 Wrote Letter L-087 of 1679-06-13 to Nehemiah Grew asking him to acknowledge two letters from earlier that year
June 13, 1679 Wrote Letter L-088 of 1679-06-13 to Lambert van Velthuysen about the origin of life and the lack of appreciation by physicians and surgeons
June 17, 1679 Lambert van Velthuysen wrote Letter L-089 to Leeuwenhoek about procreation
July 11, 1679 Wrote Letter L-090 of 1679-07-11 to Lambert van Velthuysen about about the chalk produced by gouty patients and about bladder stones
July 20, 1679 Robert Hooke read his translation of Letter L-080 of 1679-04-25 at a weekly meeting of the Royal Society
July 27, 1679 Robert Hooke showed the Royal Society microscopical observations of the liquor in a ram's testicles
August 1, 1679 Robert Hooke wrote Letter L-091 of some time in August 1679 to Leeuwenhoek; now lost
August 10, 1679 Robert Hooke showed the Royal Society microscopical observations of a cock's testicles
August 15, 1679 Appointed city inspector of imported and exported liquids / wine gauger
August 25, 1679 Called "an unlearned, but ingenious man" by Peter Pels
September 4, 1679 colleague Nicolaas van der Sloot appointed co-wine gauger
September 17, 1679 Paid tax on his personal stock of wine
October 13, 1679 Wrote Letter L-092 of 1679-10-13 to Robert Hooke to inquire of Hooke why he had not received any correspondence from the Royal Society for months, also discussed bladder stones
October 18, 1679 Lambert van Velthuysen wrote Letter L-093 of 1679-10-18 to Leeuwenhoek about his delay in responding and gout
October 27, 1679 Robert Hooke wrote Letter L-094 of 1679-10-27 to Leeuwenhoek about examining fecund and sterile eggs for spots
October 30, 1679 cousin Pieter Abrahams Hogenhouck buried
November 1, 1679 Philosophical Collections number 1 published in London, including Leeuwenhoek's Letter 28 of 1679-04-25 (AB 43) to Nehemiah Grew
November 14, 1679 Wrote Letter L-095 of 1679-11-14 to Lambert van Velthuysen about gout, salt, and drinking tea
November 20, 1679 Wrote Letter L-096 of 1679-11-20 to Robert Hooke, copying his Letter L-095 of 14 November 1679 about gout, salt, and drinking tea
January 12, 1680 Wrote Letter L-097 of 1680-01-12 to Robert Hooke about the structure of wood and sperm in fish
January 16, 1680 Wrote Letter L-098 of 1680-01-16 to Robert Hooke, enclosing a copy of Letter L-085 of 1679-05-20 to Constantijn Huygens about the number and size of little animals
January 25, 1680 Robert Hooke read part of Letter L-096 of 1680-01-12 about the structure of wood
February 1, 1680 Robert Hooke read Letter L-085 to Huygens of 1679-05-20 about the number and size of little animals in ginger water
February 2, 1680 Robert Hooke wrote Letter L-099 to inquire whether Leeuwenhoek would accept election to the Royal Society
February 7, 1680 microscopist Jan Swammerdam died
February 8, 1680 Elected a member by the Royal Society
February 13, 1680 Wrote Letter L-100 of 1680-02-13 to Robert Hooke that being elected a member of the Royal Society would be an honour
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
February 29, 1680 The Royal Society ordered that its coat of arms be engraved on the silver box holding Leeuwenhoek's diploma
March 4, 1680 The Royal Society discussed a silver box for Leeuwenhoek's diploma
March 7, 1680 The Royal Society further discussed Leeuwenhoek's diploma
March 8, 1680 Thomas Gale wrote Letter L-101, sending Leeuwenhoek official notice of his election as member of the Royal Society
March 21, 1680 Royal Society postponed reading of Letter L-085 of 1679-05-20 to Huygens
March 28, 1680 Royal Society again postponed reading of Letter L-085 of 1679-05-20 to Huygens
April 5, 1680 Wrote Letter L-102 of 1680-04-05 to Robert Hooke about the testicles and sperm of a rat and organisms in the gills of oysters and in the sap of vines
April 11, 1680 Robert Hooke read Letter L-102 of 1680-04-05 about rat sperm and organisms in gills of oysters and sap of vines
April 22, 1680 Robert Hooke wrote Letter L-103 to Leeuwenhoek as official notice of his election as member of the Royal Society
May 13, 1680 Wrote Letter L-104 of 1680-05-13 to Members of the Royal Society expressing his surprise and gratitude at being elected a member
May 13, 1680 Wrote Letter L-105 of 1680-05-13 to Robert Hooke to gratefully accept his election as a foreign member of the Royal Society and to acknowledge the receipt of his diploma
May 13, 1680 Wrote Letter L-106 of 1680-05-13 to Thomas Gale about little animals in sap and whether little animals are in the air
May 23, 1680 Robert Hooke read the three letters of 1680-05-13 thanking the Royal Society
June 14, 1680 Wrote Letter L-107 of 1680-06-14 to Robert Hooke, a short cover letter
June 14, 1680 Wrote Letter L-108 of 1680-06-14 to Thomas Gale about beer, yeast, crab's eyes in vinegar, and little animals reproducing in hermetically-sealed tubes
June 20, 1680 Robert Hooke produced the two letters of 1680-06-14 from Leeuwenhoek at a meeting of the Royal Society
June 27, 1680 The Royal Society read Letter 108 of 1680-06-14 about beer, yeast, a little animals in hermetically sealed tubes
August 9, 1680 Wrote Letter L-109 of 1680-08-09 to Robert Hooke to ask whether the Royal Society received previous letters and to promise further investigations into the formation of blood
August 13, 1680 Constantijn Huygens, jr., called Leeuwenhoek "the great man of the century"
September 28, 1680 Wrote Letter L-110 of 1680-09-28 to Thomas Gale to inquire whether Letter 107 of 1680-06-14 had arrived
November 12, 1680 Wrote Letter L-111 of 1680-11-12 to Robert Hooke about blood globules, lees of wine, globules in rain water, milk vessels, reproduction, little animals in the male seed of animals, and their incomprehensible smallness
November 21, 1680 Robert Hooke read the headings of Letter L-111 of 1680-11-12
December 5, 1680 Francis Aston promised the Royal Society to translate Letter L-111 of 1680-11-12 into English
January 1, 1681 Sat for Cornelis de Man's Anatomy Lesson of Dr. 's Gravezande
January 8, 1681 Appointed curator of the abandoned estate of Willemtie Pieters Touw
January 22, 1681 The Royal Society read Francis Aston's translation of Letter L-111 of 1680-11-12 about the lees of ale and wine
April 29, 1681 cousin Jannitgen Huijchs Leeuwenhoek buried
June 8, 1681 cousin Maria Maertens Leeuwenhoek married Jan den Appel
June 17, 1681 co-worker Daniel Bogaert buried
July 4, 1681 Robert Hooke wrote Letter L-112 of 4 July 1681 to thank Leeuwenhoek for previous letters and to promise to respond more promptly in the future
July 17, 1681 David Gregory wrote Letter L-113 to Leeuwenhoek as cover letter for Letter L-112 from Hooke
August 9, 1681 nephew Anthonij Jans de Molijn married Magdalena van Poelgeest
November 4, 1681 Wrote Letter L-114 of 1681-11-04 to Robert Hooke about hog bristles, shedding hair, blackheads; living little animals in excrement, horse urine, clay, and gout
November 12, 1681 Robert Hooke produced Letter L-114 of 1681-11-04 from Leeuwenhoek
November 19, 1681 Robert Hooke read Letter L-114 of 1681-11-04
November 26, 1681 Members of the Royal Society discussed Leeuwenhoek's observations of hair
December 1, 1681 Robert Hooke wrote Letter L-115 of some time in December 1681 to Leeuwenhoek about his previous letters
December 3, 1681 Members of the Royal Society discussed Leeuwenhoek's microscopes
December 10, 1681 Philosophical Collections number 3 published in London, including Leeuwenhoek's Letter L-111 of 1680-11-12 to Robert Hooke
January 1, 1682 Visited by Cornelis Bontekoe
January 10, 1682 Philosophical Collections number 4 published in London, including Leeuwenhoek's Letter L-114 of 1681-11-04 to Robert Hooke
January 28, 1682 Received fees from new citizens in the name of the city's camerbewaarders and messengers
February 1, 1682 Philosophical Collections number 5 published in London, including Leeuwenhoek's Letter L-116 of 1682-03-03 to Robert Hooke
March 3, 1682 Wrote Letter L-116 of 1682-03-03 to Robert Hooke about muscle fibres, hair, the cell nucleus in the erythrocytes of fishes, the liver of salmons, beards of oysters, and the structure and growth of oyster shell
March 11, 1682 Robert Hooke read the first part of Letter L-116 of 1682-03-03 about striated muscle fibres of mammals and fishes
March 18, 1682 Robert Hooke read part of Letter L-116 of 1682-03-03 about muscle fibers
March 20, 1682 Robert Hooke wrote Letter L-117 to Leeuwenhoek that his observations were well received by the Royal Society
March 26, 1682 Robert Hooke wrote Letter L-118 to Leeuwenhoek that his observations of shellfish muscles were well received by the Royal Society and concurred with his own
April 1, 1682 Philosophical Collections number 7 published in London, including Leeuwenhoek's Letter L-119 of 1682-04-04
April 4, 1682 Wrote Letter L-119 of 1682-04-04 to Robert Hooke about the structure of the muscle tissue of lobsters and shrimps.
April 15, 1682 Robert Hooke read his Letter L-117 of 1682-03-20 and Leeuwenhoek's reply, Letter L-119 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 L-120 of 1682-07-28 to Robert Hooke, now lost, asking whether figures of the anatomy of wood in Letter L-097 of 12 January 1680 will be published in print
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 1, 1683 Wrote Letter L-121 of some time in 1683 to an unknown "Sir"
January 22, 1683 Wrote Letter L-122 of 1683-01-22 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 17, 1683 The Royal Society read Letter L-122 of 1683-01-22 to Christopher Wren
February 26, 1683 Francis Aston wrote Letter L-123 of 26 February 1683 about problems translating his letters and opposition to his views
March 9, 1683 Wrote Letter L-124 of 1683-03-09 to Francis Aston promising to send observations about generation and colors
March 27, 1683 Francis Aston wrote Letter L-125 to Leeuwenhoek about new Royal Society officers
May 20, 1683 Wrote Letter L-126 of 1683-05-20 to Anthonie Heinsius about generation and about the circulation of the blood, which he intends to communicate in a letter to the Royal Society
June 7, 1683 Anthoinie Heinsius wrote Letter L-127 to Leeuwenhoek about his observations concerning generation and blood circulation
July 16, 1683 Wrote Letter L-128 of 1683-07-16 to Christopher Wren about the procreation of frogs, sperm in fowl's egg, reproduction of rabbits, little animals in frog intestines, a theory about digestion in humans and fish, and blood
July 22, 1683 Wrote Letter L-129 of 1683-07-22 to Anthonie Heinsius about Heinsius's reactions to an earlier letter
July 28, 1683 The Royal Society read Letter L-128 of 1683-07-16 about reproduction, little animals, digestion, and blood
August 4, 1683 The Royal Society discussed Letter L-128 of 1683-07-16 about the male seed in egg yolks
August 27, 1683 Francis Aston wrote Letter L-130 to Leeuwenhoek, thanking him for his recent letter and agreeing to admit two Dutch noblemen to a meeting of the Royal Society
September 1, 1683 Two Dutch noblemen wrote Letter L-131 some time in early September 1683 to Leeuwenhoek about the fear that kept them from attending a meeting of the Royal Society
September 2, 1683 Wrote Letter L-132 of 1683-09-02 to Anthonie Heinsius, requesting his opinion of observations in Letter L-128
September 10, 1683 Anthonie Heinsius wrote Letter L-133 to Leeuwenhoek about recent observations of generation
September 16, 1683 Wrote Letter L-134 of 1683-09-16 to Anthonie Heinsius about whether Heinsius would like a copy of his speculations on the living organisms in mouths and on the structure of the skin
September 17, 1683 Wrote Letter L-135 of 1683-09-17 to Francis Aston about saliva, nasal hairs and blackheads, skin, pores, calluses, and cleaning teeth; the discovery of bacteria in tartar
September 30, 1683 Wrote Letter L-136 of 1683-09-30 to Anthonie Heinsius, a note accompanying a copy of Letter L-135
October 1, 1683 Melchisédech Thévenot wrote Letter L-138 of October 1683 to Leeuwenhoek, a courteous reply
October 1, 1683 Wrote Letter L-137 of October 1683 to Melchisedec Thévenot with some observations
October 8, 1683 Anthonie Heinsius wrote Letter L-139 of 8 October 1683 to Leeuwenhoek that his work was making a positive impression in Paris and that some of his letters would be published in the new Journal de Médecine
October 11, 1683 Francis Aston wrote Letter L-140 to Leeuwenhoek about the translation of a Dutch phrase concerning egg yolks
October 14, 1683 Wrote Letter L-141 of 1683-10-14 to Anthonie Heinsius in reply to his recent Letter L-139
October 18, 1683 Anthonie Heinsius wrote Letter L-142 of in response to Letter L-141
October 26, 1683 Wrote Letter L-143 of 1683-10-26 to Francis Aston in reply to Letter L-140 about egg yolks
November 3, 1683 The Royal Society read and discussed Letter L-135
November 10, 1683 The Royal Society discussed Leeuwenhoek's observations about pores in the skin in Letter L-135
December 28, 1683 Wrote Letter L-144 of 1683-12-28 to Francis Aston about human skin and its diseases, the intestines, the effects of vinegar, the intestinal wall and peristalsis, and an experiment to demonstrate the adsorption of food nutrients in the intestines.
January 1, 1684 Daniel Gaesbeeck wrote Letter L-145 of 1684-01-01 to Leeuwenhoek about why he was publishing his letters
January 1, 1684 Published Eyerstok (Ovary), Letters 37, 39 (L-122, L-135)
January 1, 1684 Published Humor Cristallinus (Crystalline Humor), Letter 41 (L-147)
January 1, 1684 Published Onsigtbare Geschapene Waarheden (Invisible Creation Truths), Letters 32, 33, 39 (L-108, L-111, L-135)
January 1, 1684 Published Schobbens in de Mond (Scales in the Mouth), Letter 40 (L-144)
January 6, 1684 Authorized as curator to inspect estate of Willemtie Pieters Touw by her heir
February 23, 1684 The Royal Society read Letter L-144 of 1683-12-28 to Francis Aston
March 7, 1684 Francis Aston wrote Letter L-146 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 L-147 of 1684-04-14 to Francis Aston about lenses and corneas, the function of eye-lids, the involuntariness of blinking, the optic nerve, and the skin of Moors

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