Letters written by Leeuwenhoek

Alle de Brieven / Collected Letters has over 350 letters. However, only those in this chronology that Leeuwenhoek designated Letter 1, Letter 2, etc. did he consider to contain publishable microscopic observations.

Date
April 28, 1673 Wrote Letter L-001 of 1673-04-28 to Henry Oldenburg about mould and a bee's stinger and eye
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
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
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 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 Wrote Letter L-009 of 1674-04-24 to Constantijn Huygens about his further observations about blood, bones, teeth, and salt
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
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.
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 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
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.
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
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
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 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
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 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
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 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
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 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
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 27, 1676 Wrote Letter L-047 of 1676-11-27 to Henry Oldenburg, now lost
January 1, 1677 Wrote Letter L-049 of some time in 1677 to Robert Boyle, now lost
February 15, 1677 Wrote Letter L-051 of 1677-02-15 to Christiaan Huygens to thank him for translating a letter into French
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
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
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 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
December 2, 1677 Wrote Letter L-061 of 1677-12-02 to William Brouncker
January 1, 1678 Wrote Letter L-064 of some time in 1678 to Robert Boyle; now lost
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
February 14, 1678 Wrote Letter L-069 to Joseph Williamson, as Grew had requested
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
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
September 27, 1678 Wrote Letter L-074 of 1678-09-27 to Nehemiah Grew about sweat and globules in saliva and blood
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
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 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 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 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
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
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
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
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
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
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
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
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
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 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
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
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.
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
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
March 9, 1683 Wrote Letter L-124 of 1683-03-09 to Francis Aston promising to send observations about generation and colors
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
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
September 2, 1683 Wrote Letter L-132 of 1683-09-02 to Anthonie Heinsius, requesting his opinion of observations in Letter L-128
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 Wrote Letter L-137 of October 1683 to Melchisedec Thévenot with some observations
October 14, 1683 Wrote Letter L-141 of 1683-10-14 to Anthonie Heinsius in reply to his recent Letter L-139
October 26, 1683 Wrote Letter L-143 of 1683-10-26 to Francis Aston in reply to Letter L-140 about egg yolks
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.
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
July 25, 1684 Wrote Letter L-150 of 1684-07-25 to Members of the Royal Society about parts of the brain of several animals, chalk stones of gout, leprosy, and the scales of eels
January 5, 1685 Wrote Letter L-152 of 1685-01-05 to Members of the Royal Society about salts in wine and vinegar and in the stomach, the eye, the need for food and water, Descartes's theory on smallest water particles, and a theory of taste - salt, sour and sweet
January 23, 1685 Wrote Letter L-154 of 1685-01-23 to Members of the Royal Society about salts and their crystals and his theory about the causes of taste
March 30, 1685 Wrote Letter L-157 of 1685-03-30 to Members of the Royal Society about sperm, the uterus of a bitch, sheep embryos, ovaries in young animals and apples, and his claims that sperm are the life-carriers and that there are male and female sperm
July 13, 1685 Wrote Letter L-159 of 1685-07-13 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
August 10, 1685 Wrote Letter L-162 of 1685-08-10 to Anthonie Heinsius about cochineal
September 21, 1685 Wrote Letter L-164 of 1685-09-21 to Anthonie Heinsius about cochineal
October 12, 1685 Wrote Letter L-166 of 1685-10-12 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
January 22, 1686 Wrote Letter L-168 of 1686-01-22 to members of the Royal Society about cinnabar naturalis, gunpowder, saltpeter, and air made by gunpowder and crab's eyes
April 2, 1686 Wrote Letter L-173 of 1686-04-02 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 14, 1686 Wrote letter L-174 of 1686-04-14 to Antonio Magliabechi, now lost
May 14, 1686 Wrote Letter L-175 of 1686-05-14 to members of the Royal Society about gall-nuts found on oak trees and the germination of plants
June 10, 1686 Wrote Letter L-177 of 1686-06-10 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
July 10, 1686 Wrote Letter L-178 of 1686-07-10 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 made watertight
September 10, 1686 Wrote Letter L-180 of 1686-09-10 to Daniël Papenbroek, a cover letter for Letter L-181
September 10, 1686 Wrote Letter L-181 of 1686-09-10 to Antonio Magliabechi, a cover letter for a copy of one of his books
October 30, 1686 Wrote Letter L-182 of 1686-10-30 to Antonio Magliabechi, a cover letter for copies of two of his books
March 1, 1687 Wrote Letter L-185 of 1687-03-01 to James II, King of England, as the dedication for one of his volumes
April 4, 1687 Wrote Letter L-186 of 1687-04-04 to the members of the Royal Society about the structure of the teeth of elephants, pigs, humans, oxen, and horses and about toothache
May 9, 1687 Wrote Letter L-187 of 1687-05-09 to members of the Royal Society about the structure of 'stone' of the medlar and the coffee bean and acid in plants
June 13, 1687 Wrote Letter L-188 of 1687-06-13 to members of the Royal Society about wheat and the seeds from a variety of plants
July 11, 1687 Wrote Letter L-189 of 1687-07-11 to members of the Royal Society about eggs of silkworms and caterpillars and humans' squinting and a theory for its cause
August 6, 1687 Wrote Letter L-190 of 1687-08-06 to members of the Royal Society about the calander and the louse and against spontaneous generation
August 6, 1687 Wrote Letter L-191 of 1687-08-06 to Robert Boyle about his recent letters
September 9, 1687 Wrote Letter L-192 of 1687-09-09 to members of the Royal Society about ant eggs, larvae and its development, feeding, sting, cocoon and nest
October 17, 1687 Wrote Letter L-193 of 1687-10-17 to members of the Royal Society about amber, 'burned paper' from the sky, rotifers, maggots, blow flies, the stinging hairs of nettles, and the East-Indian centipede
November 28, 1687 Wrote Letter L-194 of 1687-11-28 to members of the Royal Society about his discovery that cochineal was an insect and his experiments with cinchona bark
January 1, 1688 Wrote Letter L-195 of sometime in 1688 to Robert Boyle, now lost
May 25, 1688 Wrote Letter L-196 of 1688-05-25 to members of the Royal Society about a medicinal root and bladderstones
July 6, 1688 Wrote Letter L-197 of 1688-07-06 to the members of the Royal Society bezoar stone, monkey stone, gout tubercles, and red coral and white coral
August 3, 1688 Wrote Letter L-198 of 1688-08-03 to the members of the Royal Society about plaster, alabaster, gypsum, Muscovite glass, cobblestone, shell lime, masonry mortar, lime, cement, sand stone, and slate
August 24, 1688 Wrote Letter L-199 of 1688-08-24 to the members of the Royal Society about gnats, horseflies; growth of branches, germination of wheat plants, the soft and hard roe of cod, and the number of sperm in a cod's soft roe
September 7, 1688 Wrote Letter L-200 of 1688-09-07 to the members of the Royal Society
September 23, 1688 Wrote Letter L-201 of 1688-09-23 to Melchisedec Thevenot, a cover letter for a copy of Leeuwenhoek's Letter L-200, published separately as Den waaragtigen omloop des bloeds.
January 1, 1689 Wrote Letter L-202 of sometime in 1689 to Antonio Magliabechi, a cover letter for one of his books
January 12, 1689 Wrote Letter L-203 of 1689-01-12 to Robert Boyle, a cover letter for Continuatio epistolarum and a copy of Letter L-204
January 12, 1689 Wrote Letter L-204 of 1689-01-12 to the members of the Royal Society about his observation of the circulation of the blood in a variety of fish as well as a description of the construction of his ‘eel spy-glass’ and the slime on the skin of an eel
April 1, 1689 Wrote Letter L-206 of 1689-04-01 to the members of the Royal Society
October 1, 1689 Wrote Letter L-207 of October 1689 to Christiaan Huygens about sending books to father Constantijn Huygens in London
September 18, 1691 Wrote Letter L-210 of 1691-09-18 to Antonio Magliabechi about
November 27, 1691 Wrote Letter L-212 of 1691-11-27 to the members of the Royal Society about blood, chyle, and an experiment to discover the volume of water when it is cold and when it is heated
January 4, 1692 Wrote Letter L-213 of 1692-01-04 to the members of the Royal Society about bladder and kidney stones and a chalk-like substance from a gout stone
February 1, 1692 Wrote Letter L-214 of 1692-02-01 to the members of the Royal Society about various peppers and their taste, tea and its effects of tea on digestion, and Spanish fly
March 7, 1692 Wrote Letter L-216 of 1692-03-07 to the members of the Royal Society about corn-weevels, corn-moths, caterpillars, butterflies, calanders, lice in corn-lofts, little animals in rain water, black-flies in blossoms, and maggots in cheese
April 22, 1692 Wrote Letter L-217 of 1692-04-22 to Richard Waller about the construction of an air pump and experiments with different liquids, seeds and small stones in urine, a hog's hair in the skin of a child, and grains of wheat
June 24, 1692 Wrote Letter L-218 of 1692-06-24 to the members of the Royal Society about more experiments with his air-pump, the structure of and blood in an insect's wing, a grey owlet moth, and the wing of a very small fly
August 12, 1692 Wrote Letter L-220 of 1692-08-12 to the members of the Royal Society about the shaft of a bird's feather as used in a quill, the lens and cornea of the human and calf eyes, 'wood-pipes' in different species of wood, bulrushes, and pine and lime wood
September 16, 1692 Wrote Letter L-221 of 1692-09-16 to the members of the Royal Society about little animals in dental tartar, theories of eel reproduction, worms in eel intestines, and blood vessels in grasshoppers
September 23, 1692 Wrote Letter L-222 of 1692-09-23 to Mary, Queen of Great Britain, the dedication to Derde Vervolg der Brieven
July 1, 1693 Wrote Letter L-225 of 1693-07-01 to Richard Waller, cover letter for a volume in Latin and confirmation of receipt of Letter L-224
October 15, 1693 Wrote Letter L-228 of 1693-10-15 to the members of the Royal Society about colors and the life cycle of fleas
October 27, 1693 Wrote Letter L-229 of 1693-10-27 to Pieter Rabus about procreation of the flea, the leather-jacket, and the mite
December 8, 1693 Wrote Letter L-230 of 1693-12-08 to Richard Waller, a cover letter
December 20, 1693 Wrote Letter L-231 of 1693-12-20 to the members of the Royal Society about spiders, lice, and mites
January 19, 1694 Wrote Letter L-232 of 1694-01-19 to Richard Waller as a cover letter for Letter L-231
January 24, 1694 Wrote Letter L-233 of 1694-01-24 to the members of the Royal Society about tapeworms and salt and sand in cod intestines
February 12, 1694 Wrote Letter L-235 of 1694-02-12 to Richard Waller as a cover letter for Letter L-233
February 24, 1694 Wrote Letter L-236 of 1694-02-24 to the members of the Royal Society about his experiments with solid phosphorus
March 2, 1694 Wrote Letter L-239 of 1694-03-02 to the members of the Royal Society about ear wax and hair, body hair, the amount of sweat secreted from the human body, and the possibility that sperm might penetrate the ovum
March 19, 1694 Wrote Letter L-240 of 1694-03-19 to the members of the Royal Society refuting George Garden's ideas in Letter L-227 about the role of the ovary and eggs
April 2, 1694 Wrote Letter L-241 of 1694-04-02 to the members of the Royal Society about the tongue of an ox and a pig and the heart of a sheep, ox, duck, chicken and cod
April 30, 1694 Wrote Letter L-242 of 1694-04-30 to the members of the Royal Society about his criticisms of Buonanni's theory of spontaneous generation, about mussels, barnacles, shrimp larvae, the eye of a dragon-fly, gnat, fly, and ant, and about ant eggs
May 26, 1694 Wrote Letter L-244 of 1694-05-26 to Richard Waller, cover letter for copy of Vierde Vervolg der Brieven
September 14, 1694 Wrote Letter L-245 of 1694-09-14 to Richard Waller about blood circulation and having sent six copies of his portrait to London
November 30, 1694 Wrote Letter L-246 of 1694-11-30 to Pieter Rabus about about dragon-fly eyes and eggs, crab eyes, vertebrate corneas, another rejection of spontaneous generation, and the impregnation of women
April 10, 1695 Wrote Letter L-247 of 1695-04-10 to Anthonie Heinsius about blood and its circulation in a crab's leg, crystals in evaporated crab blood, and the hairs on a crab's leg
April 22, 1695 Wrote Letter L-248 of 1695-04-22 to Frederik Adriaan van Reede about the apple-blossom weevil, its larvae, their danger, and their metamorphosis and the reproduction of black flies on apple tree blossoms
May 1, 1695 Wrote Letter L-251 of 1695-05-01 to Anthonie Heinsius about weevils, nutmegs and their safe storage, and tobacco seeds and their germination
May 18, 1695 Wrote Letter L-253 of 1695-05-18 to Frederik Adriaan van Reede about the apple-blossom weevil, caterpillars and the metamorphosis of the small ermine moth, and parasitic flies
May 21, 1695 Wrote Letter L-254 of 1695-05-21 to Pieter Rabus about the eggs and blood vessels of the ray
May 23, 1695 Wrote Letter L-255 of 1695-05-23 to Maarten Etienne van Velden about the impossibility of small flies being generated from the body of a big dead caterpillars, again refuting the theory of spontaneous generation
July 10, 1695 Wrote Letter L-260 of 1695-07-10 to Frederik Adriaan van Reede about aphids, their reproduction, and the unsuccessful search for male aphids
July 12, 1695 Wrote Letter L-261 of 1695-07-12 to Maarten Etienne van Velden about the metamorphosis of caterpillars and of parasitic larvae coming out of a dead caterpillar
July 20, 1695 Wrote Letter L-262 of 1695-07-20 to Anthonie Heinsius about about scales from his own skin, wool threads from his stockings, salt from his sweat, and air bubbles and salt crystals from his ear wax
July 21, 1695 Wrote Letter L-263 of 1695-07-21 to Pieter Rabus about the report that a large caterpillar emerged from a woman's ear and fumigation with sulphur to remove it; Leeuwenhoek cannot find any mites in his own auditory canal
August 15, 1695 Wrote Letter L-264 of 1695-08-15 to Frederik Adriaan van Reede about oysters and their larvae, repudiating spontaneous generation
August 15, 1695 Wrote Letter L-265 of 1695-08-15 to Antonio Magliabechi, the dedication of Arcana Naturae Detecta
August 16, 1695 Wrote Letter L-266 of 1695-08-16 to inform Antonio Magliabechi that he has dedicated Arcana Naturae Detecta to him; he mentions the visit of the Elector Palatine
August 18, 1695 Wrote Letter L-267 of 1695-08-18 to Anthonie Heinsius about detonating gunpowder in a closed glass bulb and measuring the increase in volume after the explosion; in a partial vacuum, glass bulbs may implode
August 20, 1695 Wrote Letter L-268 of 1695-08-20 to Frederik Adriaan van Reede about again about oysters and their sperm and aphids and other parasites
September 10, 1695 Wrote Letter L-270 of 1695-09-10 to Pieter Rabus about his attempt to breed maggots with his own ear-wax as food and a movement in his ear due to the vibration of a little hair against the ear-drum
September 18, 1695 Wrote Letter L-271 of 1695-09-18 to Johann Wilhelm von Pfalz-Neuburg about swan mussel sperm, eggs, embryos, and locomotion, small animals as food for larger ones and oysters and their larvae; he again refutes spontaneous generation
October 18, 1695 Wrote Letter L-274 of 1695-10-18 to Antonio Magliabechi to accompany a parcel of books, which Leeuwenhoek gave to Baron Bettino Riasoli for delivery
October 31, 1695 Wrote Letter L-276 of 1695-10-31 to Magliabechi to acknowledge the receipt of Magliabechi's Letter L-272, to report on the books he sent and on his recent Letter L-271 to Johann Wilhelm von Pfalz-Neuburg
October 31, 1695 Wrote Letter L-277 of 1695-10-31 to Jacob Calckberner to request that he forward a package of books to Magliabechi
November 3, 1695 Wrote Letter L-279 of 1695-11-03 to Johann Wilhelm von Pfalz-Neuburg about larvae from swan mussels, little animals in water taken out of swan mussels, and extracts from letters to Oldenburg and Brouncker about the quantity of little animals
December 1, 1695 Wrote Letter L-281 of 1695-12-01 to Frederik Adriaan van Reede, the dedication of the Fifth Continuation of the Letters (Vijfde Vervolg der Brieven)
December 22, 1695 Wrote Letter L-282 of 1695-12-22 to acknowledge the receipt of two letters by Magliabechi and to tell him once again that the books have been forwarded to him
December 28, 1695 Wrote Letter L-283 of 1695-12-28 to Hendrik van Bleyswijk about herring, their stomach worms, the food in herring stomachs, and how small fish like herring catch food
February 20, 1696 Wrote Letter L-285 of 1696-02-20 to Frederik Adriaan van Reede about the anatomy of the body louse, especially the sexual organs and the louse's rapid reproduction, and his opposition to Jonston's and Kircher's observations on lice
March 8, 1696 Wrote Letter L-287 of 1696-03-08 to Nicolaas Witsen about white mace caused by vermin, a moth from a larva taken from mace, larvae and wings of the merchant grain beetle, and nutmeg; warehouses should be painted to protect spices from vermin
June 1, 1696 Wrote Letter L-289 of 1696-06-01 to Pieter Rabus about dowsing rods and the hazel branches used to make them, iron, and loadstone
July 6, 1696 Wrote Letter L-292 of 1696-07-06 to Nicolaas Witsen about his analysis of the mineral that Witsen sent with Letter L-291, ant stings, and lacquer particles on a tree that originate from the tree itself, not from ants
July 10, 1696 Wrote Letter L-294 of 1696-07-10 to Nicolaas Witsen about demonstrating the rotation of the earth with the aid of a glass globe filled with water in which wax particles are floating.
July 10, 1696 Wrote Letter L-295 of 1696-07-10 to the members of the Royal Society about the circulation of blood in eels; mites, figs, strawberries, and a lobster's leg; a transcription of Christiaan Huygens's Letter L-223 about the reproduction of eels
July 16, 1696 Wrote Letter L-296 of 1696-07-16 to Frederik Adriaan van Reede about the male and female sexual organs of oysters and their larvae
July 23, 1696 Wrote Letter L-297 of 1696-07-23 to Pieter Rabus honey-dew on lime-trees; moisture from vine tendrils leads to a theory on the production of lacquer in tropical trees; his Delft friend has lost the capacity to handle the dowsing-rod
August 26, 1696 Wrote Letter L-300 of 1696-08-26 to Frederik Adriaan van Reede about plant-lice, its embryos and parasitization, black flies and their caterpillars on apple-trees, and English oysters from Zierikzee
August 28, 1696 Wrote Letter L-301 of 1696-08-28 to Antonio Magliabechi to acknowledge receipt of Letter L-293, to inquire about the reaction of the grand duke to his work, and to thank Magliabechi for sending printed matter and book news from Italy
August 29, 1696 Wrote Letter L-302 of 1696-08-29 to Hendrik van Bleyswijk about oak-wood containing beetle larvae, which appeared to be able to feed on wood, and the cause of the differences in quality of oak-wood
September 7, 1696 Wrote Letter L-303 of 1696-09-07 to thank Magliabechi for Letter L-290 of 5 June and Letter L-293 of 8 July 1696 and to request that Magliabechi spare him exaggerated praise henceforth
September 12, 1696 Wrote Letter L-304 of 1696-09-12 to Anthonie Heinsius about rennet and curd, chalk and crab's-eyes in vinegar, smoking tobacco to cure toothache, the gall-bladder and omasum of a calf, milk-clotting, and his contradiction of a physician
September 27, 1696 Wrote Letter L-305 of 1696-09-27 to Hendrik van Bleyswijk about the age of fishes, especially herring, using scales and the structure of greater weever's spine and the painfulness of its sting
October 26, 1696 Wrote Letter L-306 of 1696-10-26 to Maarten Etienne van Velden to accompany a presentation copy of his printed letters, Sesde Vervolg Der Brieven (Sixth Continuation of the Letters)
October 30, 1696 Wrote Letter L-307 of 1696-10-30 to N.N. (a gentleman in Brabant), a cover letter accompanying a copy of Sesde Vervolg der Brieven
November 15, 1696 Wrote Letter L-309 of "latter part" of 1696 to Harmen van Zoelen about what I had learned from an East India Trader
February 12, 1697 Wrote Letter L-314 of 1697-02-12 to Maarten Etienne van Velden, regretting Van Velden's difficulties caused by his defence of Copernicus and in support, enclosing a copy of a letter from a gentleman in Brabant
February 19, 1697 Wrote Letter L-315 of 1697-02-19 to Hans Sloane about sending Sesde Vervolg der Brieven and wanting to receive the latest Philosophical Transactions and the works of Malpighi
March 25, 1697 Wrote Letter L-316 of 1697-03-25 to the members of the Royal Society as a cover letter to Continuatio Arcanorum Naturae
April 5, 1697 Wrote Letter L-318 of 1697-04-05 to the members of the Royal Society about experiments with magnets, a meniscus in a glass, and patients given 'sympathetic' powder as a medicine by a German quack doctor
May 15, 1697 Wrote Letter L-320 of May 1697 to Victor van Beughem about how to distribute the enclosed copies of Continuatio Arcanorum Naturae
June 6, 1697 Wrote Letter L-323 of 1697-06-06 to Antonio Magliabechi about marine fossils found in mountain rocks and the present of copies of Continuatio Arcanorum Naturae sent to Florence
July 1, 1697 Wrote letter of 1697-07-01 (AB 186) to Luca Giamberti
September 3, 1697 Wrote Letter 109 of 1697-09-03 (AB 187) to Jan van Leeuwen
September 10, 1697 Wrote Letter 110 of 1697-09-10 (AB 188) to Members of the Royal Society
November 2, 1697 Wrote letter of 1697-11-02 (AB 189) to Antonio Magliabechi
December 1, 1697 Wrote letter of 1697-12-01 (AB 190) to Johan Arnoldi
February 20, 1698 Wrote letter of 1698-02-20 (AB 191) to Antonio Magliabechi
April 17, 1698 Wrote letter of 1698-04-17 (AB 192) to Antonio Magliabechi
May 9, 1698 Wrote Letter 111 of 1698-05-09 (AB 193) to Members of the Royal Society
August 14, 1698 Wrote letter of 1698-08-14 (AB 194) to Antonio Magliabechi
September 20, 1698 Wrote Letter 112 of 1698-09-20 (AB 195) to Anthonie Heinsius
December 17, 1698 Wrote Letter 113 of 1698-12-17 (AB 196) to Harmen van Zoelen
February 1, 1699 Wrote Letter 114 of 1699-02-01 (AB 197) to N.N.
February 28, 1699 Wrote letter of 1699-02-28 (AB 198) to Antonio Magliabechi
April 26, 1699 Wrote Letter 115 of 1699-04-26 (AB 199) to Harmen van Zoelen
June 9, 1699 Wrote Letter 116 of 1699-06-09 (AB 200) to Members of the Royal Society
June 23, 1699 Wrote Letter 117 of 1699-06-23 (AB 201) to Members of the Royal Society
August 5, 1699 Wrote Letter 118 of 1699-08-05 (AB 202) to N.N.
September 25, 1699 Wrote Letter 119 of 1699-09-25 (AB 204) to Members of the Royal Society
September 25, 1699 Wrote letter of 1699-09-01 (AB 203) to Hans Sloane
October 1, 1699 Wrote Letter 120 of 1699-10-01 (AB 205) to Ehrenfried Walther von Tschirnhaus
October 16, 1699 Wrote Letter 121 of 1699-10-16 (AB 206) to Antonio Magliabechi
January 2, 1700 Wrote Letter 122 of 1700-01-02 (AB 207) to Hans Sloane
January 14, 1700 Wrote Letter 123 of 1700-01-14 (AB 208) to Nicolaes Boogaert van Belois
May 20, 1700 Wrote Letter 124 of 1700-05-20 (AB 209) to Hendrik van Bleyswijk
May 20, 1700 Wrote Letter 126 of 1700-05-20 (AB 210) to Anthonie Heinsius
June 2, 1700 Wrote Letter 125 of 1700-06-02 (AB 211) to Frederik Adriaan van Reede van Renswoude
June 14, 1700 Wrote Letter 127 of 1700-06-14 (AB 212) to Hans Sloane
June 16, 1700 Wrote Letter 133 of 1700-06-16 (AB 213) to N.N.
July 9, 1700 Wrote Letter 128 of 1700-07-09 (AB 214) to Hans Sloane
July 10, 1700 Wrote Letter 129 of 1700-07-10 (AB 215) to Anthonie Heinsius
July 27, 1700 Wrote Letter 130 of 1700-07-27 (AB 216) to Hans Sloane
August 1, 1700 Wrote Letter 131 of 1700-08-01 (AB 217) to N.N.
September 7, 1700 Wrote Letter 132 of 1700-09-07 (AB 218) to Hans Sloane
October 26, 1700 Wrote Letter 134 of 1700-10-26 (AB 219) to Hans Sloane
December 25, 1700 Wrote Letter 135 of 1700-12-25 (AB 220) to Hans Sloane
January 28, 1701 Wrote Letter 136 of 1701-01-28 (AB 221) to Hans Sloane
February 9, 1701 Wrote letter of 1701-02-09 (AB 222) to Frederik Adriaan van Reede van Renswoude
April 8, 1701 Wrote letter of 1701-04-08 (AB 223) to the Mayors of Delft
April 15, 1701 Wrote Letter 137 of 1701-04-15 (AB 224) to Members of the Royal Society
June 21, 1701 Wrote Letter 138 of 1701-06-21 (AB 226) to Members of the Royal Society
June 21, 1701 Wrote Letter 139 of 1701-06-21 (AB 225) to John Chamberlayne
June 21, 1701 Wrote letter of 1701-06-21 (AB 227) to Hans Sloane
August 2, 1701 Wrote Letter 140 of 1701-08-02 (AB 228) to Members of the Royal Society; bequest of 26 magnifying glasses
August 26, 1701 Wrote Letter 141 of 1701-08-26 (AB 229) to Frederik Adriaan van Reede van Renswoude
December 6, 1701 Wrote Letter 142 of 1701-12-06 (AB 231) to John Somers
December 6, 1701 Wrote letter of 1701-12-06 (AB 230) to Hans Sloane
December 20, 1701 Wrote Letter 143 of 1701-12-20 (AB 232) to Members of the Royal Society
February 9, 1702 Wrote Letter 144 of 1702-02-09 (AB 233) to Hendrik van Bleyswijk
February 14, 1702 Wrote Letter 145 of 1702-02-14 (AB 234) to Members of the Royal Society
April 20, 1702 Wrote Letter 146 of 1702-04-20 (AB 235) to Karl von Hessen-Kassel
April 20, 1702 Wrote letter of 1702-04-20 (AB 236) to Karl von Hessen-Kassel
April 28, 1702 Wrote letter of 1702-04-28 (AB 237) to Members of the Royal Society
December 8, 1702 Wrote letter of 1702-12-08 (AB 238) to John Chamberlayne
December 25, 1702 Wrote letter of 1702-12-25 (AB 239) to Members of the Royal Society
February 5, 1703 Wrote letter of 1703-02-05 (AB 240) to Members of the Royal Society
February 26, 1703 Wrote letter of 1703-02-26 (AB 241) to Members of the Royal Society
November 3, 1703 Wrote letter of 1703-11-03 (AB 242) to Hans Sloane
November 3, 1703 Wrote letter of 1703-11-03 (AB 243) to Members of the Royal Society
December 4, 1703 Wrote letter of 1703-12-04 (AB 244) to Members of the Royal Society
January 8, 1704 Wrote letter of 1704-01-08 (AB 245) to Members of the Royal Society
February 1, 1704 Wrote letter of 1704-02-01 (AB 246) to Members of the Royal Society
February 11, 1704 Wrote letter of 1704-02-11 (AB 247) to Petrus Valckenier
March 21, 1704 Wrote letter of 1704-03-21 (AB 248) to Members of the Royal Society
July 22, 1704 Wrote letter of 1704-07-22 (AB 249) to Members of the Royal Society
September 16, 1704 Wrote letter of 1704-09-16 (AB 250) to Members of the Royal Society
October 3, 1704 Wrote letter of 1704-10-03 (AB 251) to John Chamberlayne
November 4, 1704 Wrote letter of 1704-11-04 (AB 252) to Members of the Royal Society
December 13, 1704 Wrote letter of 1704-12-13 (AB 253) to Members of the Royal Society
March 3, 1705 Wrote letter of 1705-03-03 (AB 254) to Members of the Royal Society
March 3, 1705 Wrote letter of 1705-03-03 (AB 255) to John Chamberlayne
March 12, 1705 Wrote letter of 1705-03-12 (AB 256) to Antonio Magliabechi
March 27, 1705 Wrote letter of 1705-03-27 (AB 257) to Members of the Royal Society
April 24, 1705 Wrote letter of 1705-04-24 (AB 258) to Members of the Royal Society
May 25, 1705 Wrote letter of 1705-05-25 (AB 259) to Members of the Royal Society
December 18, 1705 Wrote letter of 1705-12-18 (AB 260) to Francesco Corner
December 29, 1705 Wrote letter of 1705-12-29 (AB 261) to Members of the Royal Society
March 7, 1706 Wrote letter of 1706-03-07 (AB 262) to Govert Bidloo
March 19, 1706 Wrote letter of 1706-03-19 (AB 263) to Members of the Royal Society
April 20, 1706 Wrote letter of 1706-04-20 (AB 264) to Members of the Royal Society
June 1, 1706 Wrote letter of 1706-06-01 (AB 265) to Members of the Royal Society
December 1, 1706 Wrote letter of 1707-00-01 (AB 266) to Angelus van Wikhuysen
May 17, 1707 Wrote letter of 1707-05-17 (AB 267) to John Chamberlayne
July 5, 1707 Wrote letter of 1707-07-05 (AB 268) to Members of the Royal Society
July 12, 1707 Wrote letter of 1707-07-12 (AB 269) to Members of the Royal Society
July 25, 1707 Wrote letter of 1707-07-25 (AB 270) to Members of the Royal Society
August 10, 1707 Wrote letter of 1707-08-10 (AB 271) to Anthonie Heinsius
October 18, 1707 Wrote letter of 1707-10-18 (AB 272) to Members of the Royal Society
November 22, 1707 Wrote letter of 1707-11-22 (AB 273) to Members of the Royal Society
December 6, 1707 Wrote letter of 1707-12-06 (AB 274) to Members of the Royal Society
January 1, 1708 Wrote letter of 1708-01-01 (AB 275) to Members of the Royal Society
June 29, 1708 Wrote letter of 1708-06-29 (AB 276) to Members of the Royal Society
August 28, 1708 Wrote letter of 1708-08-28 (AB 277) to Members of the Royal Society
October 9, 1708 Wrote letter of 1708-10-09 (AB 278) to Members of the Royal Society
September 10, 1709 Wrote letter of 1709-09-10 (AB 279) to Hans Sloane
September 10, 1709 Wrote letter of 1709-09-10 (AB 280) to John Chamberlayne
November 22, 1709 Wrote letter of 1709-11-22 (AB 281) to John Chamberlayne
January 14, 1710 Wrote letter of 1710-01-14 (AB 282) to Members of the Royal Society
February 2, 1710 Wrote letter of 1710-02-21 (AB 283) to Members of the Royal Society
June 6, 1710 Wrote letter of 1710-06-06 (AB 284) to Members of the Royal Society
November 11, 1710 Wrote letter of 1710-11-11 (AB 285) to Members of the Royal Society
August 15, 1711 Wrote letter of 1711-08-15 (AB 286) to Anthonie Heinsius
August 18, 1711 Wrote letter of 1711-08-18 (AB 287) to James Petiver
September 22, 1711 Wrote letter of 1711-09-22 (AB 288) to Members of the Royal Society
November 23, 1711 Wrote letter of 1711-11-23 (AB 289) to Anthonie Heinsius
December 29, 1711 Wrote letter of 1711-12-29 (AB 290) to Anthonie Heinsius
December 29, 1711 Wrote letter of 1711-12-29 (AB 291) to Anthonie Heinsius
March 1, 1712 Wrote letter of 1712-03-01 (AB 292) to Members of the Royal Society
April 12, 1712 Wrote letter of 1712-04-12 (AB 293) to Members of the Royal Society
June 10, 1712 Wrote letter of 1712-06-10 (AB 294) to Members of the Royal Society
November 8, 1712 Wrote Letter I of 1712-11-08 (AB 296) to Anthonie Heinsius about the muscle fibres of a whale
November 8, 1712 Wrote letter of 1712-11-08 (AB 295) to Anthonie Heinsius, a cover letter for AB 296
December 17, 1712 Wrote Letter II of 1712-12-17 (AB 297) to Anthonie Heinsius about salts in the blood of a shrimp and the muscle fibres and enveloping membranes of cod, shrimp, flounder, and perch
February 28, 1713 Wrote Letter III of 1713-02-28 (AB 298) to Jan Meerman about wheat and barley grains, beans, peas, and chestnuts, vessels and membranes in coconut rind, and the embryo in an apple pip and in a coconut
March 14, 1713 Wrote Letter IV of 1713-03-14 (AB 299) to Jan Meerman about the eye of a whale, the lens, and the cornea and calculations of the pressure upon a whale's eye at great depth
March 25, 1713 Wrote Letter V of 1713-03-25 (AB 300) to Adriaen van Assendelft
March 29, 1713 Wrote Letter VI of 1713-03-29 (AB 301) to Anthonie Heinsius
June 28, 1713 Wrote Letter VII of 1713-06-28 (AB 302) to Members of the Royal Society
June 30, 1713 Wrote Letter VIII of 1713-06-30 (AB 303) to Anthonie Heinsius
October 12, 1713 Wrote letter of 1713-10-12 (AB 304) to Hans Sloane
October 24, 1713 Wrote Letter IX of 1713-10-24 (AB 305) to Antony Cinck
June 22, 1714 Wrote Letter X of 1714-06-22 (AB 306) to Members of the Royal Society
August 21, 1714 Wrote Letter XI of 1714-08-21 (AB 307) to Members of the Royal Society
October 26, 1714 Wrote Letter XII of 1714-10-26 (AB 308) to Members of the Royal Society
November 4, 1714 Wrote Letter XIII of 1714-11-04 (AB 309) to Adriaen van Assendelft
November 9, 1714 Wrote Letter XIV of 1714-11-09 (AB 310) to Members of the Royal Society
November 20, 1714 Wrote Letter XV of 1714-11-20 (AB 311) to Members of the Royal Society
January 11, 1715 Wrote letter of 1715-01-11 (AB 312) to Anthonie Heinsius
March 26, 1715 Wrote Letter XVI of 1715-03-26 (AB 314) to Antony Cinck
July 7, 1715 Wrote Letter XVII of 1715-07-07 (AB 315) to Antony Cinck
September 28, 1715 Wrote Letter XVIII of 1715-09-28 (AB 317) to Gottfried Leibniz
November 18, 1715 Wrote letter of 1715-11-18 (AB 319) to Gottfried Leibniz
November 18, 1715 Wrote Letter XIX of 1715-11-18 (AB 320) to Gottfried Leibniz
February 25, 1716 Wrote letter of 1716-02-25 (AB 321) to Anthonie Heinsius
March 3, 1716 Wrote Letter XX of 1716-03-13 (AB 322) to Gottfried Leibniz
May 10, 1716 Wrote Letter XXI of 1716-05-10 (AB 324) to Hubert Kornelis Poot
May 16, 1716 Wrote Letter XXII of 1716-05-16 (AB 325) to Gerard van Loon
May 19, 1716 Wrote Letter XXIII of 1716-05-19 (AB 326) to Gottfried Leibniz
May 22, 1716 Wrote Letter XXIV of 1716-05-22 (AB 327) to Cornelis Spiering
June 12, 1716 Wrote Letter XXV of 1716-06-12 (AB 324) to Antony Cinck
June 22, 1716 Wrote Letter XXVI of 1716-06-22 (AB 325) to Jan Gerard Kerkherdere
September 17, 1716 Wrote Letter XXVII of 1716-09-17 (AB 326) to Abraham Cornelis van Bleyswyck
September 28, 1716 Wrote Letter XXVIII of 1716-09-28 (AB 327) to Herman Boerhaave
November 5, 1716 Wrote Letter XXIX of 1716-11-05 (AB 328) to Herman Boerhaave
November 17, 1716 Wrote Letter XXX of 1716-11-17 (AB 329) to Gottfried Leibniz
November 21, 1716 Wrote Letter XXXI of 1716-11-21 (AB 330) to Herman Boerhaave
March 2, 1717 Wrote Letter XXXII of 1717-03-02 (AB 331) to Abraham Cornelis van Bleyswyck
March 6, 1717 Wrote Letter XXXIII of 1717-03-06 (AB 332) to Members of the Royal Society
March 6, 1717 Wrote Letter XXXIV of 1717-03-06 (AB 333) to Members of the Royal Society
May 6, 1717 Wrote Letter XXXV of 1717-05-06 (AB 334) to Ewout van Bleiswijk
May 26, 1717 Wrote Letter XXXVI of 1717-05-26 (AB 335) to Abraham Cornelis van Bleyswyck
June 15, 1717 Wrote Letter XXXVII of 1717-06-15 (AB 336) to Members of the Royal Society
July 6, 1717 Wrote Letter XXXVIII of 1717-07-06 (AB 337) to Antony Cinck
July 13, 1717 Wrote Letter XXXIX of 1717-07-13 (AB 338) to Jan Gerard Kerkherdere
August 18, 1717 Wrote Letter XL of 1717-08-19 (AB 339) to Adriaan Johannes Swalmius
August 26, 1717 Wrote Letter XLI of 1717-08-26 (AB 340) to Herman Boerhaave
September 10, 1717 Wrote Letter XLII of 1717-09-10 (AB 341) to Frederik Adriaan van Reede van Renswoude
September 17, 1717 Wrote Letter XLIII of 1717-09-17 (AB 342) to Members of the Royal Society
October 8, 1717 Wrote Letter XLIV of 1717-10-08 (AB 343) to Members of the Royal Society
October 22, 1717 Wrote Letter XLV of 1717-10-22 (AB 344) to Members of the Royal Society
November 20, 1717 Wrote Letter XLVI of 1717-11-20 (AB 345) to Members of the Royal Society
January 9, 1720 Wrote letter of 1720-01-09 (AB 354) to members of the Royal Society about muscle fibres and membranes of a cow, mites on the flesh of a whale, and the nerves around the muscle fibres and tendons of a cow
November 20, 1720 Wrote letter of 1720-11-20 (AB 355) to members of the Royal Society about the bone membrane and the canals in bone, the cell layers and blood vessels in the bone membrane and bone from the rib of a cow
January 15, 1721 Wrote letter of 1721-01-15 (AB 356) to members of the Royal Society about the stomata of the leaves of boxwood, the number of them, and the down on the skin of a peach and a quince
January 24, 1721 Wrote letter of 1721-01-24 (AB 357) to members of the Royal Society about vessels in wood from Ambon (Indonesia), oakwood, and pinewood, the muscle fibres of a cow, a whale, and a mouse, and the structure of a red blood cell
April 11, 1721 Wrote letter of 1721-04-11 (AB 358) to members of the Royal Society about how flesh fibers are nourished by the blood vessels, this time in fish
June 27, 1721 Wrote letter of 1721-06-27 (AB 359) to members of the Royal Society about finally discovering the little holes in the membranes of beans and peas and about the little vessels in seed membranes
April 21, 1722 Wrote letter of 1722-04-21 (AB 361) to members of the Royal Society about the muscular fibres of different animals and whether iron becomes magnetic over time
May 1, 1722 Wrote letter of 1722-05-01 (AB 362) to members of the Royal Society about the structure of fat particles in sheep, lamb, flatfish, and perch
May 1, 1722 Wrote letter of 1722-05-01 (AB 363) to James Jurin, a cover letter asking for support for his observations of hermaphroditic animals
June 13, 1722 Wrote letter of 1722-06-13 (AB 365) to members of the Royal Society about the reproductive organs of a ewe and a fetus from it
June 13, 1722 Wrote letter of 1722-06-13 (AB 366) to James Jurin, a cover letter expressing doubts that inoculations protect against smallpox
July 7, 1722 Wrote letter of 1722-07-07 (AB 367) to the members of the Royal Society about calluses on human skin
July 7, 1722 Wrote letter of 1722-07-07 (AB 368) to James Jurin, a cover letter about his determination that no microorganisms are to be found in the pustules of those with smallpox
November 20, 1722 Wrote letter of 1722-11-20 (AB 369) to James Jurin about the miscroscopic structure of diamonds and rock crystal
January 15, 1723 Wrote letter of 1723-02-15 (AB 371) to members of the Royal Society about the exhaling vessels of boxwood leaves
March 19, 1723 Wrote letter of 1723-03-19 (AB 372) to members of the Royal Society about blood, the size of blood globules, the state of his health, and the role of the ovary in reproduction
May 31, 1723 Wrote letter of 1723-05-31 (AB 373) to members of the Royal Society about the structure and texture of the diaphragm, the source of his most severe ailment
August 1, 1723 Wrote letter of 1723-08-00 (AB 375) to James Jurin about the similarities between globules in blood and in the lees of wine to argue against Jurin’s hope to discover how blood globules are made
August 1, 1723 Wrote letter of 1723-08-00 (AB 376) to James Jurin about his spermist view of the generation of animals and palpitations of his diaphragm