Differences in variability of species within a single genus. Further observations on Lycopodium.

Interested in Humboldt’s river with different floras on opposite banks, and other unexplained cases of very local distributions.

Would like to visit on the weekend of 7–8 December.

Differences in floras of St Helena and Ascension.

[Notes on conversations with J. D. Hooker.] Geographical distribution; diffusion and distribution of species. Island and mountain floras; means of migration (high-roads, icebergs).

Thanks for pleasant stay at Down.

Remarks on boulders found on southern islands.

Describes the alpine character of the Andes flora and relays information on other mountain floras.

Quotes instances of seeds that retained their vitality after being carried by ocean currents.

Sends notes on the comparative floras of New Zealand, Australia, and west coast of South America.

Encloses a copy of part of a letter from George Gardner in Ceylon concerning the European character of the mountain flora.

Discusses microscopic examination of rock specimens taken from Pampas deposit and from Chilean tuff. Says he finds organic remains only in the tuff.

Thanks for CD’s comments on "sketch".

Lengthy discussion of geographical distribution and island floras.

Has been "delighted with" [Robert Chambers’] Vestiges [of creation (1844)].

Galapagos flora work goes on well.

Sends names of species found in banks of marine shells near Buenos Aires. Shells identified by G. B. Sowerby (elder). [See South America, pp. 2–3.]

Says tuff collected by CD in Pampas and Chile contains organic remains. Wants to examine specimens further and hopes for Government support in doing so.

Describes stratification of cliffs on south shore of Rio Gallegos; fossils found at base of cliffs. Speculates about geological past of the area. Discusses climate of southern Patagonia; navigation problems at the mouth of Rio Gallegos.

Gives results of soundings taken between Falkland Islands and South American mainland. Describes geology of Falklands, especially the dikes found on many islands. Comments on climate of Falklands. Discusses horses and cattle, health of his children in the Falklands. Mentions volutes found in the Falklands.

Passes on report of FitzRoy’s policies as governor of New Zealand.

Sends comparison of the floras of Society and Sandwich Islands.

Reports on an ancient town on Ascension, which is now at sea-level and approachable only by boat.

Previous letter [missing] on Edinburgh position was ill-tempered. Friends assure him that he ought to be thankful for opportunity to try for professorship.

Reports meeting with Humboldt in Paris.

Sends results of chemical tests on specimens [of salt, see South America, pp. 73–5].

Encloses abstract from Justus Liebig on composition of bones and their ability to withstand decay.

Agrees that CD’s fossil shells do not differ from those ADd’O saw in South America. Apparent differences due to errors by G. B. Sowerby. Collection magnificent; recommends special publication. Enabled ADd’O to correct error in dating of sandstone of Concepción. Lists geological periods represented in collection from Jurassic to Diluvian. Collection includes unusual group of crepidules.

Identifications of CD’s fossil shells. New species marked; many described previously by ADd’O.

Sends information on Gryphaea orientalis. [See South America, p. 212.]

Encloses analysis of salt from Patagonia. Cannot account for its inferiority.

Comments on G. B. Sowerby’s identifications of South American fossil shells [812]. [Notes from more than one original memorandum].

Comments on a compass diagram designed to show the dip, strike, and anticlinal lines of a geological formation.

Discusses cleavage planes of mineralogical specimens.