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Has been investigating the Cavendish experiments recently repeated by Francis Baily. Thinks G. B. Airy has neglected the resistance of the air in his mathematical theory. Would like to send an abstract of his investigations so that JH can judge their merits.
Is grateful for his letter on the Cavendish experiment. Gives outline of his own theories regarding certain aspects of the Cavendish experiments, and would like his opinion on these before they are incorporated into a paper.
Sends his manuscripts. Discusses some of Michael Faraday's experiments, in particular his theory on the non-magnetism of blood. Has sent Faraday a paper on the action of voltaic currents.
Explains combined British and foreign postage rate applied to JH's letter, which has been forwarded to France. [JH annotation on verso about actinometer.]
Reports organization of N. L. Lacaille's star catalog. Suggests method by which to compare this with Thomas Henderson's figures to determine Henderson's method of computation.
Wishes to obtain copy of JH's observations of sun spots at Cape of Good Hope.