Reports on good health and behavior of JH's new daughter, Caroline Emilia Herschel. Comments on Greek music and on recent results of the R.S.L. Glass Committee.

Has read his book on the decline of science and thinks that the book may do some good. Comments on various parts, and outlines things that could happen as the result. Has replied to Encke's letter about Ephemeris.

Is reluctant to sign any certificates for memberships in the R.S.L. just now [does not explain reason].

Thanks TH for some crystals, including borax, as well as a paper by J. J. Lister. JH has been cutting the borax crystals preparatory to grinding and polishing them; JH has used these crystals to observe a phenomenon previously seen with a mass of niter.

About the prices of telescope mirrors, and specifically the one of T. J. Hussey; recommends use of certain stars to test the optical quality of the mirror.

Thanks WS for excerpt from Niccolo Cacciatore's letter; comments on the awarding of medals for merit, and points out some necessary conditions which must be considered if the observations of the satellites of Jupiter are to be used in determining the constant of aberration.

Arrangements for R.S.L. annual banquet. Lord High Admiral may attend.

Received Thomas Young's portrait. Will send summary to Hudson Gurney soon. Suggests correction in proposed title.

F. G. W. Struve will arrive in July. Before HK and wife leave for Continent next week, please leave directions how Struve may obtain Struve's scale.

Is defending a change in notation for the angles of position system that JH introduced in a paper. [Postscript dated 1830-7-7 marked 'Private' and deals with business relating to the Athenaeum and a comment on Charles Babbage's book.]

Submits JH's manuscript on Thomas Young's mathematical works for HG's biography of Young. Notes their excessive obscurity. Reasons for insisting that JH's name be added no longer exist. Asks HG's votes for two candidates for Athenaeum.

Provides HG [who was writing a biography of Thomas Young] with a detailed evaluation of Young's contributions to physical science, e.g., Young's development of the principle of interference in optics.

Some comments about the [Vignette] together with its return.

Declines to write the Bridgewater Treatise on astronomy; also declines to comment on a paper due to lack of time and difficulty with the author.

Been working on a new mirror for the 20-ft. telescope; very pleased with its performance. Asks CH to distribute his fourth catalog of double stars among the Prussian and German astronomers.

Is hesitating about a decision to come in to London, because his mother seems very ill.

About JH's mother's health, his coming to London, and daughter Caroline's vaccination. Is thinking about writing a 'discourse on science,' and complains about sitting up several nights, waiting for two stars to appear and now means 'to break the telescopes & melt the mirrors.' Found passage in Cicero to serve as motto for JH's Prelim. Discourse.

Inadvertently opened draft of Thomas Young's biography sent by HG, but sealed it immediately. Adamant that JH not see this before it is published. Will not change one word of JH's critique of Young's mathematics. If criticism offends Mrs. Young, then burn JH's manuscript.

Thanks GA for the second volume of his observations; wishes the publications of the Astronomer Royal were as good; adds some comments on polarization of light by liquids, and then talks about observing Georgium Sidum [Uranus], and deals with the orbits of satellites of planets generally.

Expressing his grief over Isabella Stewart's approaching death. JH's mother is bearing the heat quite well. JH is busy observing again and his new mirror is excellent. Declines to sign [F. W.] Hope's certificate for R.S.L. because JH objects to council's current policies. Tell Peter Stewart that JH insists on paying for chinaware.