Thanks JH for letter. Regrets having missed possibility of seeing JH while in England. Asks JH to convince [Charles] Babbage to pass through Brussels instead of Rotterdam.

Expresses regrets that George Airy's memoir on spherical aberration in telescope eyepieces and WH's 'Theory of Systems of Rays' reached JH too late for adequate treatment in JH's 'Light.'

Thanks for, praises, and comments on WH's 'Systems of Rays' paper. Says WH will have a distinguished career. Mentions other works and hopes to forward them with others he receives to WH.

Suggests change in composition of a pot to be made by [Apsley] Pellatt for an experiment.

Hopes to meet JH in London, and to finish building for R.S.L. soon. Discusses various prisms for experiments. Mentions 'neat' process for drawing uranium from iron.

Outlines experiments for JC to carry out on 'agglutination of Earths for living Crucibles.'

Thanks managers of Royal Institution for generosity in offering facilities [to Optical Glass Committee] for erection of a furnace.

Proposes an adjustment in the proportions of the ingredients in the next glass-making experiment.

Discusses the poor health of Heinrich Olbers, and Johann Encke's inability to acquire the necessary instruments. Wants JH to send to CH a few of her 'Indexes.'

Thrilled by JH's encouragement concerning WH's 'Theory of Systems of Rays.' Enthusiastic about his career prospects at the University of Dublin.

Sorry that he could not meet JH when JH was in Dublin; hopes to be introduced to JH soon. Answers JH's queries about WH's work; explains that he is studying 'the general properties of systems of rays, and of the surfaces with which they are connected.'

Feels distant from her family in England. Notes that the French occupation has changed Hanover from what it was when CH left in 1772.

Discussing William Herschel's financial difficulties, CH confides that 'she never felt satisfied with the support your father received toward his undertakings, and far less with the ungracious manner in which it was granted.' Regrets WH was not able to do more work with the 40-ft. reflecting telescope.

Writing her memoirs, CH sends for JH's perusal an account of her youth.

Received the first volume of Johann Pfaff's German translation of William Herschel's papers. Just completed a second catalog of double stars; review of nebulae going slowly. JH comments on his precise sweeps.

She 'can only think of what is past, and is for ever forgetting the present.'

Thanks JH for sending his second catalog of double stars; remarks that 'by the manner in which you gentlemen now attack the starry heavens, it seems that there will soon remain nothing to be discovered.'

Awaits JH's instructions on duplicating barometer observations taken at Mt. Etna. Francesco Lunn visits, will verify observations made by MG. MG congratulates JH on the success of his efforts to measure the brightness of light with precision.

Requests JH to read his paper on the properties of chromium at R.S.L. meeting. Discusses the experiments described in the paper.

Astronomical Society will lend instruments, including a Beaufoy Clock and a transit circle, to WS for his observations.