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Would like to know the degree of sensibility to heat of JH's paper. The paper of W. H. F. Talbot is useless for his purpose as only violet heat affects it. Did JH use a flint glass prism for his spectrum experiments? Has he ever used photography to show the impression of polarization and diffraction?
Explains results obtained by R.S.L. subcommittee considering state of meteorological journal published in R.S.P.T. Wonders about feasibility of establishing 'simple but accurate meteorological register' under public authority.
Describes difficulties in attempting to produce good meteorological register and establish national meteorological observatory.
Thanks for JH's letters and the paper on photography with special reference to the effects of heat. Was present at the R.S.L. during consideration of a national observatory. Would like JH's opinion. Is working on a supplementary report on meteorology.
Sending a notice about the polarization of the sky. Also some practical papers he set at Durham. Has the obelisk ready for shipment to the Cape. Has asked Richard Taylor to send him a copy of his report on Meteorology.
About various testimonials, from JH and others, for JF's application for a government pension.
Is grateful for JH's letter and commendation regarding application for a government pension; will endeavor to carry out his recommendations.
Would like to know the composition of the fluid in JH's actinometers.
Would like to see him for a few minutes to discuss a paper he is preparing for the R.S.L. on actinometer observations.
No meeting of the R.S.L. on the 19th but could arrange to see him before dinner. Hopes to spend the summer amongst the glaciers.
Is grateful for his letter and photographs. Will send him his paper on glaciers, which he is pleased to see interests him. Thomas Brisbane must be in error about the refusal of the Royal Society of Edinburgh to print his magnetic observations.
Accepts JH's invitation to join Magnetical and Meteorological Committee of B.A.A.S. Will see JH at Cambridge next week. T. M. Brisbane's magnetic observations will be published in Transactions [of Royal Society of Edinburgh]. JH was responsible for making these known.
Sends new edition of JF's Travels [through the Alps of Savoy]. Hopes JH will examine the theoretical part.
Comments, after delays due to busyness, on JH's queries on the calibration of actinometers and gives results of experiments.
Sympathizes with JH's feelings of regret over actinometer readings. Has procured a new thermometer and carried out experiments toward correction of actinometers.
Gratitude for gift of JH's Cape Results. Just returned from geological tour of highlands with [Bernhard] Studer from Bern [Switzerland]. Hopes to purchase Madame Witte's 'model of the Moon...for Edinburgh,' if it has not been bought in London. Observed Neptune at Oxford in company with U. J. J. Leverrier, J. C. Adams, and Wilhelm Struve.
Regarding the possibility of a new edition of JH's Treatise Astr. originally published in Lardner's Cyclopaedia. Has found it very useful for his students.
B.A.A.S. and Royal Society of Edinburgh have been approached to apply to the government for finance to send an observer and reflector to the Cape Observatory. Does JH think this advisable, with his knowledge of conditions at the Cape?
Outlines theory behind and method for preparing thermographic paper, which allows observers to determine 'what share each ray of the spectrum bears in producing the observed total effects.'