When he was staying with Headlam he arranged to show him round a chemical works. Wonders if the sketch JH made at the time of a method for reducing chemical fumes is still extant. Would be glad to receive a copy of it, and the name of the works.
Is little conversant in physiology so is unable to discuss GH's theories. Suggests some alterations to the text of the article.
Congratulates him on his discovery of the parallax of Alpha Centauri. Comments on this and makes suggestions for further examination.
Recommends buying optics for 7.5-inch telescope from Metz and Mahlers in Munich and having those mounted in London.
Has been considering what principle should be followed in the computation of the orbits of double stars. Gives his views.
Obviously a ring of planets is being discovered. Congratulations on the discovery. Is the reading based on one night's observations only? Gives it a female name, possibly Iris.
Has written a letter to Lord John Russell outlining the case of Andries Stockenström. Does not wish to become involved in Cape politics or the affairs of the Anti-Slavery Society much as he appreciates their importance.
Comments on the pros and cons of a statue or professorship in memory of John Dalton. Would favor a professorship. Thinks the rules should be amended. Knows a good man for the position.
Will distribute the prospectuses of LH's book as desired, but regrets he will be unable to subscribe for a copy himself as its price is too expensive for his means. Pleased to hear of his good health.
Tells WT about JH developing the thermographic paper which is susceptible to 'calorific' and 'chemical' rays of light.
The Physical [?] Committee is meeting the next day to deal with the question of establishing a magnetic and meteorological observatory. JH [Chair of the Physical Committee?] cannot attend the meeting and sends his supportive, but cautioning, comments.
Supports the remeasurement of N. L. Lacaille's geodetic arc in South Africa, giving a number of reasons for his support.
A note to accompany some letters being returned to GA.
Comments on the operational and organizational details of the magnetic and meteorological observatories, and on the supervisory committee's [the Physical Committee of the R.S.L.] responsibilities.
Remarks on the significant increase in brightness of the star Eta Cygni, and comments on several other variable stars.
Extensive letter answering the many queries about nebulae raised by AH in his 1844-4-18 [letter contains notes made by AH].
Sends thanks and very high praise for AH's first volume of Kosmos. Also comments on a number of other astronomical matters.
Mother and baby [Margaret and Julia] are doing well; JH asks questions relating to the Grovers giving up the lease on JH's property at Slough.
Convey his thanks to the King for the Order of Merit. Regrets he did not see the King or AH when they visited London recently. Gives astronomical information.
Comments on JD's work in photography; JH goes on to talk about JH's ideas of 'chemical' rays of light.