Regrets he was unable to see JH when in town last week. Outlines the scheme for a new club.

Plans to write John Russell in an effort to secure a pension for Thomas Maclear; asks for R.A.S. and WS's support. Asks WS to obtain some facts relevant to pension request.

Glad JH is writing the meteorology. Collecting materials for charts of ocean. Forwards some of this to JH for comments.

Sympathizes with JH's feelings of regret over actinometer readings. Has procured a new thermometer and carried out experiments toward correction of actinometers.

Is desirous of procuring impressions of prismatic spectra from all parts of the globe. These should show the chemical influence of the solar rays. The B.A.A.S. may be able to help or Colonel Edward Sabine. Can JH use his influence?

Notes on part of CD’s species sketch.

Asks WS if possible to enclose a note by Francis Beaufort to John Russell concerning request for pension for Thomas Maclear. Lays aside double star observations; continues work on orbit equation.

In response to a request, JH is not willing to part with any letters from his father, William, but will send one of William Herschel's notes to his sister, Caroline.

Thanks for his note. Is writing to remove any misconceptions JH may have about the proposed new club. Michael Faraday will be joining on condition that there will be no dinners.

Corrects a misunderstanding of his description of salt deposits [in South America, pp. 74–5]. The salt referred to was from Rio Negro, and was coarsely crystallised and free of other saline substances found in sea-salt. CD believes its lesser value in curing meat is owing to the absence of muriates of lime and magnesia and suggests that it might be worth while to add them to the Rio Negro salt.

No summary available.

W. S. Jacob sends Alpha Centauri observations to R.A.S.; uses JH's Cape Results as a guide to double stars.

A specimen of Machairodus offered for sale by F. J. Muñiz.

Discusses possible publication in England of paper by Muñiz describing the skeleton.

Sends pamphlet on scarlatina in the Pampas.

Has received copy of CL’s Principles [7th ed.].

Comments on reading Annales des sciences naturelles.

David Milne’s and Robert Chambers’ views on Glen Roy.

Mentions sales of South America.

Describes visit to his father at Shrewsbury.

Giving details of Thatcham Church and of the tablet, which is to be erected in memory of Francis Baily. Sculptor will be sending proof of the inscription.

Asks WS to take the chair at the next meeting of the R.A.S [probably concerning the Adams-Leverrier dispute].

Memorial presented by members of the British Association for the Advancement of Science and other scientific societies, submitting that natural history is inadequately provided for by the present constitution of the Board of Trustees of the British Museum.

Notes that actinometer observations prove faulty due to problem with instruments. Asks that WS notify Indian observatories to join others in terminating such observations until JH finds method of getting around problem.

Thanks for sending his book on the Correspondence of James Watt. Hopes to give it the attention it deserves, but meanwhile comments on the water controversy of Henry Cavendish, Joseph Priestley, and James Watt.

Believes he has succeeded in integrating elliptic and hyperbolic functions in finite terms, and sends a paper in which this is discussed.