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Against changing location of Royal Observatory [from Greenwich], but will defer to opinion of [G. B. Airy] Astronomer Royal. Airy is most competent to judge situation. Still ill.
Too ill to work on anything besides nebula catalogue. Discusses recent meteorological phenomena, period of solar spots, and great pyramid.
Occupied with matters besides magnetism lately. Interest in science of Prince Consort [Albert] is praiseworthy. Discusses several observatories and letter of [T. W.?] Blakiston.
Lists magnetic books received from ES. It will be some time before JH can direct his attention to magnetic issues.
Asks for information concerning the magnetic observations and compilations made in various countries and regions.
Thanks for declination readings from photograms at Kew. Thinks meteorological observatory on Vesuvius is good idea, but not sure a magnetic one is. Includes two charts of world.
Has been too ill to write terrestrial magnetism paper for Edinburgh Review. Suggests other people to write it.
Advises on the construction of the Melbourne reflecting telescope. Thinks [W. P.] Wilson should come to watch construction.
Has signed certificate for [W. F.] Hook. [See ES 1861-12-5] Congratulates ES [on presidency of R.S.L.]. JH on B.A.A.S. balloon committee. Proposes design for metallic thermometer.
Pleased ES and [Balfour?] Stewart like plan for metallic thermometer. Suggests way to obviate effect of pendulous movement of the suspended weight.
Asks help of R.S.L. in reducing all observations to 1870 in JH's catalog of nebulae. Estimates cost at £10.
JH's catalog of nebulae, reduced to 1880 as originally planned, is nearly complete and consumed all of £20 granted by R.S.L. Seeks £16 more to expand catalog and reduce data to 1860, as recommended by G. B. Airy.
Needs to know soon if R.S.L. will approve grant to expand JH's catalog of nebulae. Otherwise G. B. Airy will dismiss man employed to do those computations. [JH annotation: Sent similar letter to G. G. Stokes on same date.]
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Discusses proposed Melbourne telescope, including [William] Lassell's proposed mounting and its implications for observing nebulae.