Notes on the table above:
* Two letters, December 12, 1703 and February 1, 1704, were published as one article.
** In 1712, numbers were published from the end of volume 27 and from volume 28.
*** In 1714, numbers were published from vols 28 and 29, each containing one article by van Leeuwenhoek.
The long letter of June 28, 1713, was published in volume 28 in 1714 titled "Some Further Microscopical Observations on the Animalcula Found Upon Duckweed, &c."
The earlier letter of November 8, 1712, was published in volume 29, also in 1714, titled "Concerning the Fibres of the Muscles, &c." and dated as October 12, 1713.
The next year, for volume 18, Waller continued, publishing two of van Leeuwenhoek's letters, from July 10, 1686 and March 7, 1692.
This left a large body of letters that remained untranslated into English until the late 20th century's Alle de Brieven / Collected Letters.
In 1693 Sloane was appointed Secretary of the Royal Society, joining Waller, who had been there for several years. E.S.J. Brooks wrote in Sir Hans Sloane: The Great Collector and His Circle London, (1954, p. 82):
Sloane was the owner and editor of the journal, responsible for obtaining the items to be published. Profits were rare and losses were made up from his assets.
From then, for the next twenty years (excepting only 1710 when John Harris replaced Waller for one year), these two, Waller and Sloane were the two secretaries and Sloane was the editor of Philosophical Transactions. For van Leeuwenhoek, beginning in 1695, the tide turned.
Note: Birch's History stops at the end of 1687, so we do not have as complete an idea of what happened as we did during earlier years.
Given the uncertainties in London, van Leeuwenhoek continued publishing his letters is Dutch editions and roughly parallel Latin translations. London was far away and his Dutch printer was literally next door on the Hippolytusbuurt.
While as a fellow of the Royal Society, van Leeuwenhoek never visited London or attended a meeting, in 1700, Hans Sloane visited him. We have no record of that meeting, and we have no reason to think that Sloane spoke Dutch. Two things happened afterwards that were perhaps caused by that meeting:
he started publishing again in London
he stopped self-publishing in Delft
To be specific, from July 1700 until the end of 1712, almost all the 40 letters that van Leeuwenhoek wrote were published by Sloane in volumes 22 through 29.
Compare this to how Sloane treated Halley. After the first year of Sloane's editorship, from 1698 to 1713, volumes 20 - 28, Halley had only 5 articles published while van Leeuwenhoek had 57, half his career total. And then during period 6, Halley was editor and not publishing van Leeuwenhoek. However, he published 13 of his own articles in volume 16.In addition, as shown in the far right column on the table on the left, van Leeuwenhoek published a collection of 39 letters, the Sevende Vervolg der Brieven / Seventh Continuation of the Letters, in 1702. After that, he let the English translations in Philosophical Transactions suffice.
The table on the left also shows that van Leeuwenhoek had one article in volume 28 of Philosophical Transactions. He also had one article in volume 29, an article that Halley may have inherited from his successor, Hans Sloane, to whom the letter was addressed.
Thus, a dozen letters were published in both Philosophical Transactions and the Sevende Vervolg. However, the bulk of the letters written during this period were not published in Dutch/Latin. Some of them remained in the English translation only until the Alles de Briven / Collected Letters project caught up with them at the end of the 20th century and published the full letters in both Dutch and English.
Unfortunately, the Alles de Briven / Collected Letters project has stopped with volume 15, which ends with the letter of July 25, 1707.
Just as unfortunately, Edmond Halley replaced Hans Sloane as secretary and Philosophical Transactions editor in 1713. He seems to have followed through on Sloane's commitments because he published van Leeuwenhoek's letter of November 8, 1712, in volume 29 in 1714. But after that, it would be six years until van Leeuwenhoek would see another of his letters in Philosophical Transactions.
Royal Society officers
Sir Robert Southwell
Charles Montagu (afterwards Earl of Halifax, KG)
John, Lord Somers
The position of secretary, always held by two men, one usually the editor of Philosophical Transactions, was stable during this period. Richard Waller held the one for more than twenty years continuously, except for 1710. In 1693, Hans Sloane replaced Thomas Gale and also held the position for twenty years until Halley replaced him.
Pr = printer
Sev = Sevende
HK = Henrik Krooneveld, van Leeuwenhoek's printer and next-door neighbor.
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