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Comments on JH's laying to rest of William Herschel's 40-foot telescope.
On the effect of JH's visit to Nantes.
Note accompanying a sketch of an earlier time in the lives of JG and JH (sketch by Jane Grahame).
Francis Beaufort has shown him his copy of the 'Requiem' and would be pleased if JH would send him a copy. Mr. Harvey and himself have been observing nebulae on the clear nights. Is having a Munich object glass mounted. Will be in town towards the end of the month.
Wishes JH would lay hands on the memorandum concerning the Zenith observatory on Etna. Explains why JH's theories regarding a point in gunnery do not work in actual practice. Queries the measurement given by JH for the height of Etna.
Regarding the correct figure for the height of Etna, W. H. Smyth favors the half foot measurement. Regarding falls of stones from Vesuvius. Encloses calculations made by professor at Naval College. Remembers large balls of lava at Teneriffe.
Was not certain how to reply to his last obliging letter. Has resolved to write to Professor [J. P.?] Müller. Thought it right to inform JH of his plans.
Drawing attention to his prediction of the storms of 1838 and 1839.
Affairs at the Cape; thinks Andries Stockenström is the man to be sent out to negotiate with the Boers. Would like JH's views on the subject.
Has been applying his mode of calculation for the barometrical heights for the years 1815-23 and sent the results to the R.S.L. As JH may not see them he sends a few comments on them. Would like a suitable colleague to share his labors.
Encloses some more calculations of height by means of the barometric mean temperature. Comments on these. Staying at Ackworth until April.
Would like JH's account of his own method of fixing a photograph as noted in his memoir. Singular phenomenon of the Daguerreotype. Hopes to produce a photographic paper to equal the silver plate before the month has expired. Will let him know when his process is complete.
Is grateful for the handsome manner in which JH has acknowledged RH's work. Would be willing to prepare a memoir for the R.S.L. Does Louis Daguerre's patent affect RH's manufacture of photographic papers? Has not studied the bromnets so far, but has studied the effects of bromine on plates. Comments on his results.
Sends his paper for communication to the R.S.L. Will send some more examples later as his camera has developed a defect.