Chapter 22: 215-227
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Fr. Boscovich
Roger Joseph Boscovich (18 May 1711 – 13 February 1787) was a physicist, astronomer, mathematician, philosopher, diplomat, poet, Jesuit, and according to some a polymath from Ragusa (today Dubrovnik, in Croatia), who lived for a time in France, England and some Italian states. He is famous for his atomic theory and made many important contributions to astronomy, including the first geometric procedure for determining the equator of a rotating planet from three observations of a surface feature and for computing the orbit of a planet from three observations of its position. In 1753 he also discovered the absence of atmosphere on the Moon... Note: like Maskelyne, there is a lunar crater named after him. From WIKI
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The first book he publish'd was upon Fluxions.
Newton's name for the form of differential calculus he developed was the "Method of Fluxions", see [1].
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De Litteraria Expeditione et Soforthia
This translates to "about letter military operation and soforthia," so maybe: "you've studied about the letter of military operation and so forth." ....?
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mio caro Ruggiero
my dear Roger (Italian)