Thanks for gelatine [?] paper. Hopes to photograph the sun.

Invites to dinner. Will try to arrange meeting between ES and Danish hydrographer Captain Lahrtman[?].

Encloses differences determined through indications of portable barometer, standard, thermometer, and various other instruments.

Comments on ES's measurement [in his Account of Experiments to Determine the Figure of the Earth] indicating 'the increase of the fraction expressing the earth's compression.' Predicts that ES's result will cause a 'sensation,' but does not commit himself to it.

Responds to ES's proposal to conduct a series of meteorological observations from the peak of Teneriffe. Promises to bring it before the Board of Longitude for consideration for support.

Responds to ES's letter of 1825-4-4, stating that JH now understands that ES will proceed with the Teneriffe observations only if funds are provided. Praises Sabine's previous work.

On 1825-4-7 presented ES's proposal for experiments at Teneriffe to the Board of Longitude, which judged the experiments not sufficiently relevant to the Board's concerns. Offers to seek endorsement from the R.S.L.

Invites ES to join him and other scientists for dinner. Requests that ES prepare a detailed description and justification of his proposed Teneriffe experiments for consideration by the R.S.L. Council.

Read your proposal on experiments at Teneriffe to the R.S.L. Council, which declined to make 'an especial recommendation' in support of them to the government.

Encloses R. Bonne's letter and gives further instructions regarding rockets for experiment.

Six artillery men have been placed under ES's command. Encloses letters from Charles Bonne. Asks ES to oversee the arrival of 180 rockets to be used at Wrotham and Fairlight. Proposes that ES test whether a light at Wrotham can be seen at Fairlight in which case gunpowder will be used instead of rockets. Sets date for ES to meet Bonne in Hornoy. Urges ES to record his expenses for the Board of Longitude.

Encloses note about transportation of rockets, telescope, and chronometer, with suggested schedule for experiments.

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.

Writes about arrangements for an R.S.L. council meeting.

Discusses Harvard University offer to make magnetic measurements. Requests ES to read Admiralty extracts. Asks questions regarding JH's upcoming review [in Quarterly Review] of several works on terrestrial magnetism.

Expresses great pleasure that the fixed observatories have received official approval and financial support. Approves of ES's cost estimates. Encloses copy of the B.A.A.S. memorial. Agrees to tell Humphrey Lloyd to order instruments as requested by ES.

Sends plans for and detailed explanation of device to suspend cot or couch in ship so as to 'destroy' ship's motion and alleviate seasickness.

Regrets deeply the little notice given to the observatories and to Humphrey Lloyd in the R.S.L. President's recent speech. Urges ES to comfort Lloyd. States R.S.L. 'is no longer the sole arena in which a scientific name can be acquired.'

Declines to take steps to call a special committee or council meeting of the R.S.L. regarding foreign communications of the observatories, noting his own wish to stay out of R.S.L. affairs.

On what is to happen at the expiration of a three year period assigned for the undertaking of certain magnetic observations.