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.

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.

Sends, for signature, a statement approving change in rules of the Leopoldino Academy [Dresden] to be forwarded to CD to sign.