<60r>

Sir

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

Servant

Is. Newton.

Cambridge.
March 1st –867.

<60v>

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

London.

2

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

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Read Mar 2: 1686.

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© 2017 The Newton Project

Professor Rob Iliffe
Director, AHRC Newton Papers Project

Scott Mandelbrote,
Fellow & Perne librarian, Peterhouse, Cambridge

Faculty of History, George Street, Oxford, OX1 2RL - newtonproject@history.ox.ac.uk

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