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After collecting and reducing all nebula observations by JH and William Herschel, JH objects to GA's suggestion that JH should pay for calculations needed to prepare catalogue of nebulae. Hesitates to request additional funds from R.S.L.
Acknowledges receipt of Royal Observatory's astronomical, meteorological, and magnetic observations for 1863.
Concerned about 'Commercial weight' of new standard of weights and measures.
JH responds with an assessment of the Indian observatories [see GA's 1866-9-24].
Has seen colored fringes on clouds described, and explained, in a journal. Does GA accept the explanation?
Asks GA many questions about his magnetical explanation [see GA's 1861-4-22].
Sends £10 to GA, exhausting grant from R.S.L. GA's estimate of 5600 nebulae was too high. Recommends asking R.S.L. for additional £50.
Explains how to detect errors in catalogued positions of stars. List of new nebulae in [G. F. J. A.] Auwers's catalogue.
[Form Letter] GA's address, as Astronomer Royal, to Board of Visitors. Progress report on F. G. W. Struve's proposal for joint French-English-Belgian triangulation survey.
About some major variations in terrestrial magnetism readings.
Comments on GA's theory of the thermo-electric origin of terrestrial magnetism.
Has read the syllabus of GA's lectures on magnetism; it reminds JH of his attempt to solve the problem of 'Mahomet's coffin', which JH still believes would work.
About William Whewell's accident, and the ideas of E. F. W. Klinkerfüss on the behavior of light due to the motion of a star source.