No summary available.

Encloses an outline of JH's paper on iron [? 'On the Separation of Iron from Other Metals,' RSPT (1821), 293-9].

Thanks HO for JH's election to the Royal Academy of Copenhagen. Comments on some chemical and magnetical experiments.

Is making arrangements to meet with TH in London.

[Responding to WT's 1826-2-7], JH thanks WT for materials sent, makes suggestions regarding WT's upcoming trip to Geneva, and asks WT to deliver a book to [Alfred] Gautier.

Denies any knowledge of a R.S.L. Council meeting. Trusts the council will make its decisions based on public duty and science, not on the fact that the decision must be defended in later discussions. Has passed [George] Fisher's letter on to members as ES requested.

Informs WS that the Astronomical Society has voted WS a gold medal for WS's observations of double stars. Says he is now observing nebulae. Confirms receipt of WS's fourth volume of observations sent by [E. C. F.?] Knorre. Asks WS to verify [Henry] Kater's observations on black zones in Saturn's outer ring.

Thanks for ME's letter; JH hopes to see her in Ireland in summer.

Asks for the use of an invariable pendulum and a clock from the Board of Longitude so that G. B. Airy and William Whewell can carry out experiments to measure the change in gravity and the mean density of the earth, in a Yorkshire coal mine.

Thanks for valuable communication, which will be laid before the Board of Longitude. Has completed own paper for the Astronomical Society. J. F. Encke has sent more copies of the proof-map. Ernesto Capocci's observations of the comet similar to his own. Has been unable to use Charles Tully's or John Ramage's telescopes yet owing to clouds.

Remarks on FB's address on astronomy [fragment only].

Writes to urge GA to avail himself of the opportunity of working with Basil Hall in swinging the pendulum at Greenwich; concludes with a note for William Whewell about JH's view of the 'extremely irregular' figure of the earth.

Sent to CH a copy of James South's second paper on double stars and a synoptic catalog of them. Calls CH one of the first discoverers of the 'comet of 1795.' Sent to Astronomical Society a report on 300 new double stars.

Asks questions about the prospectus [see JE's 1826-3-2] prepared by the Berlin Royal Academy for a map of the heavens. Asks JE to send JH a copy of [K. L.] Harding's star atlas.

Sent medal to WS. Tells WS it was awarded to WS and [James] South. Speaks of [Francis] Baily's medal presentation speech. Lists books sent to WS.

Invites HK to dinner Saturday to meet James South and Alexis Bouvard.

[Responding to WT's 1826-3-24], JH concurs with P. S. Laplace's view about the advantage of astronomical observation from high elevations, e.g., from mountains. Comments on telescope prices, a paper by WT, Florence, and JH's plan to visit the Continent.

Encloses a letter from Dr. John Brinkley. Please send on his manuscript catalogue of nebulae. Regarding the reading and printing of CB's paper at the Analytical. Site for his pendulum experiments.

Has read his paper on vaporization with much interest and can see no objections to its arguments. Comments on some of the details.

No summary available.