Showing 1–20 of 47 items
Remarks on his illness and treatment.
Discusses MS [of Coral reefs] and changes in his view of coral reefs since Journal of researches. Mentions C. G. Ehrenberg’s observations on coral reefs.
Answers a number of queries from Lyell concerning geography and geology of Chiloé Island and its relationship to the Cordilleras.
Asks about "perched rocks" on Jura and notes their relevance to Louis Agassiz’s theory. Discusses Agassiz’s view on Jura.
Mentions seeing Robert Brown.
Notes R. I. Murchison’s discovery of shells in central England.
Weakness of negative evidence.
Discusses the role of ice in determining the geological features of the Jura. Mentions view of Agassiz. Objects to idea of "a [sea of ice] carrying rocks". Notes Agassiz’s earlier view of "ice expanded in the line of the Great Swiss Valley". Comments on Pentlands.
Defends his theory [in "Parallel roads of Glen Roy" (1839), Collected papers 1: 87–137] against the view that the "roads" were formed by glacial action.
Discusses at length Louis Agassiz’s book [Études sur les glaciers (1840)] and Agassiz’s explanation of moraines. Defends his own theory of the importance of floating ice. Relates glacier theory to his own interpretation of Glen Roy.
Mentions a paper he is writing on South American boulders and till [Collected papers 1: 145–63].
Discusses various types of coral reefs on which he has been collecting notes. Views of C. G. Ehrenberg. His conception of the formation of Bermuda.
Pessimistic about the effect of his poor health on his scientific work.
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.
Discusses relationship of subsidence to the formation of coral reefs.
Discusses growth of various species of coral. Explains significance of dead reefs.
Describes meeting of the Council of the Geological Society; the controversy involving Edward Charlesworth.
Mentions conversations with William Lonsdale about Lonsdale’s work on corals and the financial support for his work.
Murchison’s views on glaciation in Wales.
Agassiz’s observations at Glen Roy.
Believes "absurd letter" hastily read at last Geological Society Council meeting was from Charlesworth’s solicitor. Suggests that it may have been sent to entrap the Council and that it should be read over carefully.
JDH last wrote to Charles Lyell in Sep 1842. He now continues the story of the expedition. The cliff of Cape Horn did not live up to its reputation. The expedition went to Hermite Island in Fuegia. Mentions [Charles] Darwin's account of it as the summit of a submerged mountain. JDH collected Cryptogamia previously found by Menzies, Forster & Banks plus new mosses. Describes St Martin's Cove & the view of the island. Describes the island geology in detail, mentions Maxwell Harbour, Cape Spencer & arseniate of iron. The only notable insect was a Carabus. Discusses Fuegian weather. Recounts a discussion with an officer of the 'Philomel' re. Darwin's thoughts on Falkland Islands' geology. Describes the geology of the Falklands: very uniform, consisting of quartz, peat bogs & clay. Only abundant vegetation in the Falklands is grasses, noted European introductions incl: Veronica serpyllifolia, Poa Annua, Rumex sp. & Alsine nudia. JDH found pumice from the South Shetlands. Mentions a rock off the coast seen by Lieutenant Burdwood & now submerged. The expedition sailed south for Antarctica on 17 Dec & saw first ice near Clarence Island. Reached land at 'Cape Francais' & followed the coast south. Describes the landscape incl. mountainous coast, glaciers, volcanic islands & islands named by D'Urville: Trinity Land, Palmer's Land, Terre Louis Phillippe & Terre Joinville & the great landmass Biscoe called Graham's Land. Describes in great detail the geology, geography & climate of a volcanic island they landed on. Compares the snow there to that on Mt Etna as described in Lyell's son's PRINCIPLES OF GEOLOGY. Birdlife incl. Petrels, Penguins & Cormorants. Only moss, lichen & seaweed can survive the conditions on the island. Ice stopped them tracing Weddel's route but on 5 Mar reached their most southerly point 71 degrees latitude. JDH reports arriving at False Bay, Cape of Good Hope to anchor in Simon's Bay. Offers rocks to Lyell's son Charles & birds & shells to his daughters.
Mentions expected birth of child [Henrietta Emma].
BAAS meeting.
Comments on letters from G. R. Waterhouse and William Lonsdale.
Describes survival of apparently "fossil" seeds sent by W. Kemp.
Is at work on MS [of Volcanic islands].
Inquires of CL about the suitability of George Robert Waterhouse for a natural history post in the British Museum. Congratulates CL on his successful trip to the United States.
Description and defence of his view of the tosca in Banda Oriental, along the Rio Uruguay and at the Rio Negro, taking issue with A. D. d’Orbigny. Refers to the pumice in the Patagonian Territory. Two tables show the layered tosca formation along the Uruguay.
Asks about CL’s new book [Travels in North America (1845)].
Discusses views of A. D. d’Orbigny on elevation.
Mentions reading W. H. Prescott [History of the conquest of Mexico (1843)].
Regarding L. F. Menabrea's papers, thinks he is a good mathematician. Is not so sure about Augusta A. King's (Lady L[ovelace]) notes.
Remarks on fossils described in A. D. d’Orbigny’s Voyage dans l’Amérique méridionale.
Asks CL whether he has talked with John Murray concerning 2d ed. [of Journal of researches].
Mentions conversation with Hugh Cuming about South American shells. Has had G. B. Sowerby (elder) look at some specimens.
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