You'l receive the 2d Book on Thursday night or Friday by the Coach. I have directed it to be left with Mr Hunt at Gresham Coll. Pray let me beg the favour of a line or two to know of the receipt. I am obliged to you for pushing on the 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 the trouble of transcribing them all. The heads may suffice. The resistence in swift motions is in a duplicate proportion to the celerity. The deduction of the Suns Parallax from the Moons variation I cannot promise now to consider. When Astronomers have examined whether there be such an inequality of her motion in the Quadratures as I mentioned in my last & determined the quantity thereof, I may take some occasion perhaps to tell them the reason. No more at present from

Your most affectionate humble


Is. Newton.

March 1st –867.


For Mr Edmund Halley
to be left with 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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