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Trying to discover what changes were made to the 2nd edition of the Principia from Pemberton's suggestions, in his letters among the Portsmouth Papers. Believes JCA may be able to help, and may have found a formula for the motion of the Moon's apogee. See draft of letter from Newton to Cotes (Box 19/1), which was found with this letter.

Draft of letter for which the final version does not survive, of late Jul./early Aug. 1712, containing a draft of the Scholium to Proposition 35 of the Principia, 2nd ed., 1713. See A.R. Hall and L. Tilling (eds.) The correspondence of Isaac Newton. Vol. 5, 1709-1713. CUP, 1975. pp 315-319, letters 929 and 931.

The letter was discovered in JCA's papers with letters from D. Brewster, March - May 1855, (Box 5/37), and had evidently been sent to Brewster for comment and returned, through the post.

The remainder of Newton's drafts of letters to Cotes are among the Portsmouth Papers in CUL, and the final versions (other than that of this letter), are in Trinity College Library.

Transcripts of documents described in the catalogue of the Portsmouth Papers.

Sect. VI. IX. Correspondence from Cotes and Crownfield.

Notes by JCA on correspondence here transcribed.

Transcripts of documents described in the catalogue of the Portsmouth Papers.

Sect. VI. IX. Correspondence to Cotes and Crownfield.

Regarding the dependence of fluents upon measures of ratios and angles. Copied 24 Nov. 1718.