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See16/22/3 for another copy. Sympathy at death of Charles Delaunay.

Proper comparison of Hansen's and Delaunay's equations of Longitude, Latitude and Parallax [of the moon] much needed. Description of such comparisons as already exist. JCA's own parallax tables. Tables of Moon's Ephemeris might be obtained from Hind: JCA will enquire. Hill's computation of the perturbations of Jupiter and Saturn very worthy.

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.

Speech proposing that Delaunay be made a foreign member of the RS.

Comments on comparison of Hansen and Delaunay's lunar tables. Suggesting co-operative work between British and American Nautical Almanac offices. MS note by Newcomb at end giving permission for confidential sections to be published. See also JCA's draft at 16/49/1). Letter or extract of letter transcribed for MacAlister's biography.