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Incomplete. See 16/17/1 for another draft of same letter. See 36/18/1 for French translation. Acknowledgement of copies of CD's replies to LeVerrier's attacks on his theory of the moon. Nature of LeVerrier, Hansen's and Plana's errors. M. de Pontecoulant's letter in Monthly Notices of RAS.

Astronomical notes, some dated 16 May 1855. Including "Errata in Pontecoulant's Theorie Analytique" "Errata in Plana's Theorie de la lune", "Errata in Damoiseau's Theorie de la lune". "Extract from Newton's MS used by Pemberton in preparation of 3rd ed. of Principia 16 May 1855", Various memoranda, "Extract from Sherburne's Catalogue of the most eminent Astronomers, Ancient and Modern. London, 1675".