Wrote Letter L-202 of sometime in 1689 to Antonio Magliabechi, a cover letter for one of his books

January 1, 1689
Standard reference information
Collected Letters volume: 

This letter is known only by reference in another letter.

Letter 115 L-210 of 18 September 1691 to Antonio Magliabechi

Your Honour’s very welcome letter of the 27th of May … I have learned from your kind letter that my little book, after a period of more than two years, has at last come into Your Honour’s hands, and I saw to my great contentment that you have been pleased to accept it.

The article by van Rijnberk, “De briefwisseling tusschen Leeuwenhoek and Magliabechi” (The correspondence between Leeuwenhoek and Magliabechi), lists this letter to Magliabechi on p. 3150 but does not discuss it in the text of the article.

On the assumption that Leeuwenhoek would send a book that Magliabechi could read, he probably sent Continuatio Epistolarum (Continuation of the Letters), published in 1689 and containing eight letters: Letter L-186 [53] of 4 April 1687 through Letter L-194 [60] of 28 November 1687.