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Reminds JH that the algebraic formulation of the theory of the achromatic telescope eyepiece was formulated by GA.
Offering sympathy on the death of JH's daughter [Margaret Louisa].
Is sending a tract on 'Probable Errors.' Further observations on JH's article on telescopes.
Asks for his comments on the results of his Magnetic Register 1848-1857.
Further remarks concerning his Magnetic Registers [see GA's 1861-4-22].
Regarding the evaporation of water as a source of electricity. Magnetic results in relation to the North Atlantic.
Encloses printed copies of letters received from Johann Lamont regarding apparatus for examining Galvanic currents in the earth; would like his comments on them. Gave lecture in Manchester on the eclipse.