Letters with observations not in Leeuwenhoek's numbering system

Leeuwenhoek wrote 36 letters that 1) reported his observations and explained his thinking and 2) were not included in his numbering system, supplemented by Cole for the years 1702-1712. Some of them repeated obersvations and thoughts from a numbered letter. Others were very short, contained in a letter written for another purpose. Two of them, to Constantijn Huygens, had figures.

Both of the 1685 letters to Anthonie Heinsius were excerpted in Letter 60 of November 28, 1687 (AB/CL 105).

Date written AB/CL
#		 Addressed to

Period 1
1674年04月05日 4 Constantijn Huygens
1674年04月24日 7 Constantijn Huygens
1676年01月22日 20 Henry Oldenburg
1676年11月07日 28 Constantijn Huygens
1678年12月26日 41 Constantijn Huygens, 3 figs.

Period 2
1679年04月27日 44 Constantijn Huygens
1679年05月15日 46 Christiaan Huygens
1679年05月20日 47 Constantijn Huygens, 1 fig.
1679年06月13日 49 Lambert van Velthuysen
1679年07月11日 50 Lambert van Velthuysen
1679年10月13日 51 Robert Hooke
1679年11月14日 52 Lambert van Velthuysen
1679年11月20日 53 Robert Hooke
1680年01月16日 55 Robert Hooke
1685年08月10日 86 Anthonie Heinsius
1685年09月21日 87 Anthonie Heinsius

Period 3
1691年09月18日 115 Antonio Magliabechi
1693年10月27日 127 Pieter Rabus

Period 4
1695年05月21日 145 Pieter Rabus
1695年05月23日 146 Maarten Etienne van Velden
1695年07月12日 148 Maarten Etienne van Velden
1695年07月21日 150 Pieter Rabus
1695年09月10日 156 Pieter Rabus
1696年06月01日 166 Pieter Rabus
1696年07月23日 171 Pieter Rabus
1701年02月09日 222 Frederik Adriaan van Reede van Renswoude
1701年04月08日 223 N.N. Mayors and governors of the City of Delft
1701年06月21日 227 Hans Sloane

Period 5
1703年11月03日 242 Hans Sloane
1707年05月17日 267 John Chamberlayne
1710年11月11日 285 Members of the Royal Society
1711年11月23日 289 Anthonie Heinsius
1711年12月29日 291 Anthonie Heinsius

Period 6
1715年11月18日 316 Gottfried Leibniz
1718年11月28日 346 Francisco Cornaro

Period 7
1722年07月07日 359 James Jurin
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Related letters:
What Leeuwenhoek wrote ...
Wrote Letter L-005 of 1674年04月05日 to Constantijn Huygens about globules in milk and blood and the growth of hair; first mention of red blood corpuscles
Wrote Letter L-009 of 1674年04月24日 to Constantijn Huygens about his further observations about blood, bones, teeth, and salt
Wrote Letter L-031 of 1676年01月22日 to Henry Oldenburg about forwarding his mail and about sending his observations of little animals in water
Wrote Letter L-045 of 1676年11月07日 to Constantijn Huygens summarizing the observations of little animals in Letter L-040
Wrote Letter L-077 of 1678年12月26日 to Constantijn Huygens about how son Christiaan's observations of little animals correspond to his own
Wrote Letter L-081 of 1679年04月27日 to Constantijn Huygens about the number of sperm in the milt of the cod
Wrote Letter L-084 of 1679年05月15日 to Christiaan Huygens to explain more about his observations of little animals
Wrote Letter L-085 of 1679年05月20日 to Constantijn Huygens about the number and size of the little animals he was observing
Wrote Letter L-088 of 1679年06月13日 to Lambert van Velthuysen about the origin of life and the lack of appreciation by physicians and surgeons
Wrote Letter L-090 of 1679年07月11日 to Lambert van Velthuysen about about the chalk produced by gouty patients and about bladder stones
Wrote Letter L-092 of 1679年10月13日 to Robert Hooke to inquire of Hooke why he had not received any correspondence from the Royal Society for months, also discussed bladder stones
Wrote Letter L-095 of 1679年11月14日 to Lambert van Velthuysen about gout, salt, and drinking tea
Wrote Letter L-096 of 1679年11月20日 to Robert Hooke, copying his Letter L-095 of 14 November 1679 about gout, salt, and drinking tea
Wrote Letter L-098 of 1680年01月16日 to Robert Hooke, enclosing a copy of Letter L-085 of 1679年05月20日 to Constantijn Huygens about the number and size of little animals
Wrote Letter L-162 of 1685年08月10日 to Anthonie Heinsius about cochineal
Wrote Letter L-164 of 1685年09月21日 to Anthonie Heinsius about cochineal
Wrote Letter L-210 of 1691年09月18日 to Antonio Magliabechi about
Wrote Letter L-229 of 1693年10月27日 to Pieter Rabus about procreation of the flea, the leather-jacket, and the mite
Wrote Letter L-254 of 1695年05月21日 to Pieter Rabus about the eggs and blood vessels of the ray
Wrote Letter L-255 of 1695年05月23日 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
Wrote Letter L-261 of 1695年07月12日 to Maarten Etienne van Velden about the metamorphosis of caterpillars and of parasitic larvae coming out of a dead caterpillar
Wrote Letter L-263 of 1695年07月21日 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
Wrote Letter L-270 of 1695年09月10日 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
Wrote Letter L-289 of 1696年06月01日 to Pieter Rabus about dowsing rods and the hazel branches used to make them, iron, and loadstone
Wrote Letter L-297 of 1696年07月23日 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
Wrote Letter L-383 of 1701年02月09日 to Frederik Adriaan van Reede about pores in willow wood and advice for the improvement of peat
Wrote Letter L-384 of 1701年04月08日 to the mayors of Delft about his calculation of the difference between the coal measures of Delft and Rotterdam and how to calculate the volume of a pyramid
Wrote Letter L-391 of 1701年06月21日 to Hans Sloane about the claimed qualtity of other people's magnifying glasses, injuries to the cornea, and the impossibility of observing the smallest particles of matter
Wrote Letter L-412 of 1703年11月03日 to Hans Sloane to thank him for sending recent numbers of Philosophical Transactions and the book on Peruvian silver mines, also as a cover letter for Letter L-413
Wrote Letter L-452 of 1707年05月17日 to John Chamberlayne to complain that his four most recent letters to the Society had not been answered; about a bezoar stone and the visit of Corner; offered to send a copy of Letter L-436 to Magliabechi

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