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[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.

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.

Incomplete. [JCA's comments on De La Rue's speech on awarding Gold Medal of RAS] Theory of moon: where work of Plana and Damoiseau is incorrect and how it might be improved. Errors of Hansen's ditto. Plana's original reception of JCA's theory of the moon.

In JCA's hand. Sends two equations from Hansen to explain the inequality of the moon's motion [missing]. Requests that JCA may be allowed to see the letter.

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.

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.

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.

Acknowledgement of copies sent by CD of investigation into Hansen's long inequalities and corrections of LeVerrier's Annales, and CD's volume on the Theory of the Moon. Praise of CD's method.

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. See 16/17/2 for another version of this letter.

Offering PAH honorary membership of Cambridge Philosophical Society.