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Letters |
Wrote Letter L-377 of 1700-09-07 to Hans Sloane to follow up on Letter L-375 to Sloane about fly larvae in cheese |
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Letters |
Wrote Letter L-378 of 1700-10-26 to Hans Sloane about black flies on fruit trees, aphids, comparing the parthenogenetic procreation of aphids with sperm, and the development of the pupae of moths |
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Letters |
Wrote Letter L-380 of 1700-12-25 to Hans Sloane about the sperm of a ram and his objections to Nicolaas Hartsoeker's claim to have discovered sperm first in 1678 when Leeuwenhoek had written to the Royal Society about sperm in 1677 |
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Letters |
Wrote Letter L-382 of 1701-01-28 to Hans Sloane about gall on a willow and more about larvae from cheese |
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Letters |
Wrote Letter L-383 of 1701-02-09 to Frederik Adriaan van Reede about pores in willow wood and advice for the improvement of peat |
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Letters |
Wrote Letter L-384 of 1701-04-08 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 |
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Letters |
Wrote Letter L-385 of 1701-04-15 to the members of the Royal Society about sperm from cod, a calculation of its size, and ram and pike sperm |
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Letters |
Wrote Letter L-389 of 1701-06-21 to John Chamberlayne about salt crystals in rain-water and notches in a sharpened knife |
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Letters |
Wrote Letter L-390 of 1701-06-21 to the members of the Royal Society about spiders, their blood, their silk thread and its structure, their sting, and laying their eggs |
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Letters |
Wrote Letter L-391 of 1701-06-21 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 |
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Letters |
Wrote Letter L-392 of 1701-08-02 to the members of the Royal Society about circulation of blood in young eels and announcing his bequest of 26 magnifying glasses |
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Letters |
Wrote Letter L-393 of 1701-08-26 to Frederik Adriaan van Reede about measuring the fall of water, an accurate instrument for such measurements, and his invention of a level |
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Letters |
Wrote Letter L-397 of 1701-12-06 to Hans Sloane as a cover letter for Letter L-398 to John Somers |
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Letters |
Wrote Letter L-398 of 1701-12-06 to John Somers about the sperm of young cocks living for days outside the cock and whether that was long enough to fertilise a hen's egg |
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Letters |
Wrote Letter L-399 of 1701-12-20 to the members of the Royal Society about the sperm of spiders and how they copulate |
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Letters |
Wrote Letter L-400 of 1702-02-09 to Hendrik van Bleyswijk about three types of little animals from the gutter of his house, one of which was eaten by a larger animal, which could revive after being dried out |
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Letters |
Wrote Letter L-401 of 1702-02-14 to the members of the Royal Society about balsam, an apparatus he designed to inhale smoke and vapour, blood vessels in sheep lungs, his own phlegm, and the theory that cold air harms lungs |
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Letters |
Wrote Letter L-403 of 1702-04-20 to Karl von Hessen-Kassel as a cover letter for Letter L-404 |
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Letters |
Wrote Letter L-404 of 1702-04-20 to Karl von Hessen-Kassel about silkworms, the structure of the silk thread, and the organs that produce it, eyes, pincers, blood vessels, and cocoons, sperm from an adult silk moth, and the scales on its wings |
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Letters |
Wrote Letter L-405 of 1702-04-28 to the members of the Royal Society about little animals and air bubbles in rain water and the circulation of blood in an eel |
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Letters |
Wrote Letter L-407 of 1702-12-08 to John Chamberlayne about cleaning and preserving teeth by polishing them with salt and ash of tobacco and whether tea and coffee harm teeth; requested a book on Peruvian silver mines |
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Letters |
Wrote Letter L-408 of 1702-12-25 to the members of the Royal Society about duckweed, its roots and reproduction, the little animals attached to it, and asexual reproduction |
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Letters |
Wrote Letter L-409 of 1703-02-05 to the members of the Royal Society about colony-forming little animals from Delft canal water, dissolving silver and gold in acids, and why there is little duckweed on the surface of water in cold weather |
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Letters |
Wrote Letter L-410 of 1703-02-26 to the members of the Royal Society about the structure and germination of pips of oranges from Surinam and Curaçao |
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Letters |
Wrote Letter L-412 of 1703-11-03 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 |
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Letters |
Wrote Letter L-413 of 1703-11-03 to the members of the Royal Society about the liver fluke in soil from meadows, worms and other little animals in soil, and a theory about how they propogate |
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Letters |
Wrote Letter L-414 of 1703-12-04 to the members of the Royal Society about the shape of a grain of fine sand from the Dutch East Indies |
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Letters |
Wrote Letter L-415 of 1704-01-08 to the members of the Royal Society about salt crystals out of rainwater that during a "frightful storm" in December had dashed against the windows of his house |
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Letters |
Wrote Letter L-416 of 1704-02-01 to the members of the Royal Society about red sandstone from the cathedral at Utrecht compared to diamond, his theory about the origin of diamonds, and marble, Bentheim stone, alabaster, and gold and silver ore |
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Letters |
Wrote Letter L-418 of 1704-02-11 to Pieter Valckenier about rock crystal, its origins in the mountains, and fossils of ocean fish found in his Swiss mountains |
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Letters |
Wrote Letter L-419 of mid-February 1704 to Siewert Centen to refute his contention that cochineal must be a plant, not an animal |
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Letters |
Wrote Letter L-422 of 1704-03-21 to the members of the Royal Society about cochineal and the insects that are the source of this dye |
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Letters |
Wrote Letter L-423 of 1704-07-22 to the members of the Royal Society about muscle fibers of whales, the structure of the eyes' lenses of whales and cod, and his theory about why fish have no eyelids |
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Letters |
Wrote Letter L-424 of sometime before 16 September 1704 to Pieter Hotton about the canals that raise the yellow sap in a common plant |
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Letters |
Wrote Letter L-426 of 1704-09-16 to the members of the Royal Society about leaves of aloe and a plant called dragon's blood sent to him by Pieter Hotton with Letter L-425 |
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Letters |
Wrote Letter L-427 of 1704-10-03 to John Chamberlayne as a follow-up to Letter L-407 about tobbacco ashes, the salt crystals obtained from them, and an oily substance obtained by heating the ashes of tobacco |
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