Sends series of solar heliographs. If further suggestions for improvement of these are noted, please send them. Is preparing to photograph Dec. 31 eclipse.

Has no suggestions to improve photographs. Wants to determine whether the degradation of light from center to edge of sun is 'real.' Does not think sun's size affects focus.

Condolences on death of JH's daughter [Margaret] Louisa.

Thanks MS for sympathy letter. Discusses present situation in Italy. Discusses his children and their scattered locations, e.g., a son fighting in the Indigo affair. Discusses his articles for Encyclopaedia Britannica.

Detached postscript discussing sunspots, comparing them to the low barometric pressure center in cyclones. J. S. Henslow is dying.

Talked to [L.-F.-C.?] Breguet for JH. Discusses work [on hygrometer?/metallic thermometer?] in detail, including diagrams. Regrets not having seen JH's daughters in Paris. Says he is recuperating from the 'catastrophe' and can still use his left eye.

Forwards letter to HR from [L.-F.-C.?] Breguet, who desires to construct a metallic thermometer for JH. HR requests quick reply from JH.

Sends list of works received on an official form. Followed by letter. Suffers deeply from death of his wife, daughter, and her son. Had hoped to see JH in London, but JH was absent.

Realizes that they have never been introduced. Nonetheless, requests JH's personal opinion on a matter of high importance to science. Asks JH to critique a memoir.

Sends some memoirs to JH. Is keeping the most recent ones. Has always cited JH in his works. Requests JH's critique of AP's work on photo-electric images. Leaves London in an hour and regrets not having met JH.

Finds JT's work on thermotics 'highly interesting,' although criticizes measurements of 'tenuity' of vapor, and explanation of scattering of sunlight and formation of corona around moon during eclipse.

Thanks for memoirs sent.

Important office in French Institute has been passed on to MS. Compliments JH and many other members of R.S.L., and suggests exchange of ideas, asking JH for delivery of latest edition of JH's astronomy text, discusses idea of heat as motion, and other concepts. Expresses high scientific aspirations.

Discusses the project of erecting a large telescope in the southern hemisphere [Melbourne telescope] for observation of nebulae. Expresses reservations and makes suggestions about the project.

Reply to JT's 'Remarks on Radiation and Absorption.' Calls non-absorption of air and vapor key to understanding meteorological phenomena. Remarks on 'radiant heat' from moon.

Stresses importance for Balloon Committee of obtaining corresponding temperatures and pressures; describes two highly sensitive thermometers that might be built for this purpose.

Thanks for MS's works, communicated through [Picot] Tremblay. Worries that JH has insufficient time and lags behind in the physical sciences. Comments on ideas put forward in 1824 by JH and discussed by MS. Has found MS's name connected with suspension bridge over Rhone River.

Thanks for and comments on paper and lectures on 'diathermancy &c' of gases, scientific teaching, and solar chemistry. Regrets that JT mentioned all names connected with light research except JH's. Remarks on absorption of light, molecular vibrations.

Updates JH on activities of Balloon Committee, and thanks him for suggestion regarding temperature measurement. Mentions improving health of Mrs. Sykes.

Gives account of observations on lunar radiation, including detailed description of experiments.