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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.

Knobel's Table of comparisons of Greenwich Observations and Hansen's tables. Letter or extract of letter transcribed for quotation in MacAlister's biography. Possible that this particular item is JCA's own file copy.

Congratulations on work on Hansen's tables. Letter or extract of letter transcribed for MacAlister's biography.

Acknowledgement of paper on Hansen's theory. AC's treatment of Lunar theory by method of variation of elements is new; outlines the possible difficulties. JCA is applying this method to the secular inequalities of the moon's mean motion, further to paper in PTRS, 1853.

Acknowledgement of copy of paper on Disturbing functions. Origin of error of Hansen's. Agrees to look at remainder of development of [omega].

[JCA's comments on De La Rue's speech on awarding Gold Medal of RAS] Acknowledges copy of Hansen's letter sent. Disagrees with H's assertion that he never contested JCA's theory of the secular acceleration of the moon: H caused LeVerrier to attack JCA and Delaunay, and is now adapting his own theory without admitting it might be wrong.

Letter of introduction for Pierce. Plana convinced of JCA's and CD's expression of the secular acceleration of moon's mean motion. Hansen and LeVerrier might yet be convinced.

Hansen's memoir on the perturbations of the small planets.

Comments on De La Rue's speech on awarding Gold Medal of RAS to JCA. Whether a quotation from Herschel should be included. Whether LeVerrier should be mentioned in light of his and Delaunay's part in the controversy over the secular variation of the moon's mean motion. Accuracy of Hansen's and Plana's theories. Encloses copy of Delaunay's letter.

See 36/18/2 for French translation. Sends copies of reply to Pontecoulant, Plana etc: one for CD personally, one for the French Academy of Sciences.