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As the Committee is to meet on Thursday he thinks it should reconsider its decision not to publish W. H. F. Talbot's paper on the Calotype process. Gives reasons as stated in a letter he has received from Talbot.
Has been considering a reply to JL's letter of the 25th. Outlines two courses to take and prefers the latter himself. Communicate with Richard Sheepshanks regarding the viva voce.
Has received the books. Began with Karl Holtzmann's and finds the reasoning at fault. Comments on this. [Marked 'not sent.']
R.S.L. business about an observatory at the North Cape in Sweden.
Comments on a paper on the calotype by W. H. F. Talbot, adding some experiences of his own on the subject.
Comments on Louis Daguerre's work, and on the question of a North Cape observatory.
Comments on balloon ascent report, photographic paper made with vegetable colors, and the need to provide a polarizing crystal to J. B. Biot.
Comments on JL's improvements to planetary theory.
Arrangements for JL's presentation to be made to the R.A.S.
Has received JL's memoir on the tides. JH would like to amalgamate certain portions with a memoir from William Whewell. JH adds some comments on photographic experiments he has made.
Believes that R.S.L.'s request for £3000 grant to establish permanent magnetic and meteorological observatory is too hasty. Urges caution. Points out potential problems.
Is unable to come to London for the Standards Commission meeting and thus will also not be able to come to the dinner party. Encloses some recent photographs.
JH comments on JL's 'memoir on the heat of vapours,' indicating JH's dissatisfaction with the experimental basis (the experimental work of J. L. Gay-Lussac) for the conclusions. JH offers improvements in the construction and operation of the ice calorimeter.
JH has arranged for U. J. J. Leverrier, J. C. Adams, and Wilhelm Struve to visit JH together at Collingwood. JH is writing to invite JL to join them.
Promises to become more knowledgeable about [heat?] theory in order to be able to discuss it with JL. Cautions that the subject is an intricate one.
Mostly news of JH's family; JH inquires as to the state of health of JL's mother.
JH expresses some concern about the accuracy of a wet bulb thermometer, as he is not clear about the nature of the experimental base for its use.
Thanks for 'small, but intense' volume sent.