You'l receive ye 2d Book on Thursday night or Friday by ye Coach. I have directed it to be left wth Mr Hunt at Gresha{illeg}|m| Coll. Pray let me beg ye favour of a line or two to know of ye receipt. I am obliged to you for pushing on ye edition because of peoples expectation, thô otherwise I could be as well satisfied to let it rest a year or two longer. Tis a double favour that you are pleased to double your pains about it. Dr Wallis's papers may be long & I would not give you ye trouble of transcribing them all. The heads may suffice. The resistence in swift motions is in a duplicate proportion to ye celerity. The deduction of ye Suns Parallax from ye Moons variation I cannot promise now to consider. When Astronomers have examined whether there be such an inequality of her motion in ye Quadratures as I meti|n|tioned in my last & determined ye quantity ther{illeg}|e|of, I may take some occasion perhaps to tell them ye reason. No more at prsent from

Yor most affectionate humble


Is. Newton.

Feb. Cambridge.
March 1st –867.


For Mr Edmund Halley
to be left wth Mr Hunt
in Gresham College in



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Journall-Book R S. no. 8.
pag: 132.

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Read Mar 2: 1686.

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Professor Rob Iliffe
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