No summary available.

No summary available.

Discusses JH's spectrometer and possibility of using surplus from R.S.L. Donation Fund for its construction and enquiry with it into nature of light and heat.

Offers to meet FB at Manchester B.A.A.S. meeting and to bring FB to Collingwood for a quiet visit.

Has stayed in Manchester an extra day, and has managed to avoid becoming involved in the organization of next year's B.A.A.S. meeting at Cork; talks about plans for F. W. Bessel to visit Collingwood, and about JH's plans to return home.

Alerts WW that F. W. Bessel, in very poor health, will attend the Manchester B.A.A.S. meeting. JH plans to bring Bessel to Collingwood after the meeting.

JDH writes to Charles Lyell about specific points of geological interest encountered on the Ross Antarctic Expedition. Thanks Lyell for giving him Darwin's book with a description of Cape Verde. Also says he values THE GEOLOGICAL RESEARCHER & the profile of Lyell, which he keeps in his cabin with his father & Baron Humboldt's. Describes the Geology of Kerguelen Island & compares it to the account of Captain Cook who knew it as Desolation Island. Rocks incl: Trass, lava, Breccia, whinstone, volcanic conglomerations, basalt configurations, Quartzes & Zeolites. McCormick sent back fossil woods. Letter includes a sketch of Christmas Harbour. Birds incl: endemic Chionis & night Petrel. 3 insects: a Curculio, apterous moth & a spider. Describes the Kerguelen climate. Found more plants than expected: seaweeds, lichens, Mosses & Jungermannia, all perennial South American types. Writes about icebergs near Kerguelen & refers to the theory of erratic boulders which Charles Lyell's son has written about. Describes an agate fossil trunk he found in Van Diemen's Land & his notes on it in TRANSACTIONS OF THE NATURAL HISTORY SOCIETY OF TASMANIA. The Auckland Island flora resembles that of New Zealand. Describes icebergs, first seen at latitude 63 degrees south. At 66°S collected black volcanic rock containing Olivine from an iceberg, which is illustrated. Describes mountainous land mass at 71°S & an island with a penguin rookery. Dredging to 300 fathoms found marine life: chiefly Mollusca, Crustacea, Corals, Bicellaria, some Ophiura & Syenite rock deposited by an ice berg. On an island 76°S observed signs of the different natural means of rock transportation & land formation. Includes a sketch of the ship 'Erebus' anchored off this island's cliffs. Describes discovery of the volcanoes 'Erebus' & 'Terror' incl. sketch. Discusses abundance of Diatoma found in the tow net & stomachs of Salpa & his belief that it is vegetable not animal. JDH has a geological collection for Lyell Jnr.

Gives his opinion of [George] Merz, stating that he has not done anything to 'distinguish himself from a mere practical follower of [Josef] Fraunhofer.' Requests that JH send encouragement to James Challis.

Compares actinometric measurements of radiation. Explains interest in total eclipse relative to actinometry. Discusses the possibility of making actinometric measurements by photographic means.

Sorry to hear RH has been ill; JH sends some photographic examples.

Carl Steinheil has proposed making telescope mirrors by plating silver on glass. Is writing to JH to tell him that somewhat earlier he had included this process in one of his patents.

No summary available.

Of JG's intention to write a pamphlet against slavery.

Letter to accompany a complimentary copy of FB's new book on logic.

Thanks JH for his letter [1841-10-10]. Discusses difficulty of measuring distance between a star of primary largeness and a small telescopic neighbor star. Rejects theory that temperature influences observation results. Appreciates JH assessment of the correspondence between WS's work and that of [F. W.] Bessel. Complains confidentially that Bessel neglects to acknowledge WS's work on parallax, begun a year before Bessel's own. Assures JH of WS's continual efforts in observing new phenomena. Comments on JH's 'On the Revision and Rearrangement of the Constellations.'

No summary available.

Enjoyed CH's last letter.

With R.S.L. Council, is glad that compliance with JH's wishes regarding photographical inquiries has pleased JH.

Welcomes ER back to England. Met ER's host, Charles Babbage, at Greenwich yesterday. Wants to visit before ER departs for Geneva, but JH's wife is ill. Based on accounts of Geneva by ER's wife, JH sent three oldest daughters and their governess to spend summer there.

Received WB's atmospheric curves yesterday, but too late to report them [at 1842 B.A.A.S. meeting]. Final report will be presented at next [1843] meeting.