Summary

More comments on "Insular floras": community of peculiar genera in the Atlantic islands descended from European plants now extinct.

Summary

Returns notes on Confervae.

Has had information from Ehrenberg on organic forms in Atlantic dust.

Thanks for sketch of Galapagos flora.

Summary

On JDH’s suggestions for new edition of Origin.

Gray’s Atlantic Monthly articles to be published [in England] as a pamphlet.

Summary

Before JDH discusses flora of Canary Islands CD suggests he read F. B. White’s paper [see 11707], which explains stocking of Atlantic island fauna as due to changed currents during [last, or Miocene] northern glacial period.

Summary

Answers JDH’s questions on connection of SE. England and continent,

on the effect of breaking the Isthmus of Panama,

and on Madeira flora as remnant of Tertiary flora.

Cautionary remarks for JDH on his "Insular floras" speech, designed to strengthen case of "occasional migration" theory.

Summary

Includes comments about George Bentham’s anniversary address to the Linnean Society with particular notice of the favourable attention to Darwin, except for Natural Selection, and to AG’s essay in the Atlantic Monthly.

He defends [W. B.] Carpenter and [Jeffries] Wyman against [Richard] Owen.

Gossip about scientific honours and other matters.

Summary

CD encloses letter from Asa Gray, although it is critical of JDH.

Role of struggle in forming species in retreat from advancing glaciers.

Summary

Would like copy of "Galapagos flora" when published ["Plants of the Galapagos Archipelago", Trans. Linn. Soc. Lond. 20 (1851): 163–233].

Will keep JDH’s Pacific island notes till his return.

Summary

CD defends his view of land birds on St Helena.

Explains why he would not expect American plants on the Azores.

It makes him miserable that he and JDH look at everything so differently.

Summary

Comments on Huxley–Falconer dispute [see "On the method of palaeontology", Ann. & Mag. Nat. Hist. 18 (1856): 43–54].

Wollaston’s On the variation of species [1856].

Has exploded to Lyell against the extension of continents.

Plants common to Europe and NW. America as result of temperate climate.

Summary

Comments on JDH’s list – very good, but Orchids and Primula paper have too indirect a bearing to be worth mentioning. The Eozoon is a very important fact and to a much lesser degree the Archaeopteryx. Müller’s Für Darwin [1864] perhaps the most important contribution.

CD has forgotten to mention Bates on variation and JDH’s Arctic paper ["Distribution of Arctic plants", Trans. Linn. Soc. Lond. 23 (1862): 251–348] in new edition of Origin.

Now finds that Owen claims to be originator of natural selection.

Summary

Has finished Variation. May insert a chapter on man.

Still puzzled by seeds of Adenanthera.

New Zealand and Borneo flora problems continued.

Fritz Müller found six genera of dimorphic plants in one day.

Summary

Analysing results of last spring’s Primula experiments, CD infers pollen of short-styled plants "suits" long-styled plants.

Summary

Woolner’s bust.

Smith’s health.

St Helena Umbelliferae.

Brambles.

Summary

Gongora cannot be female of Acropera; it may itself be a male.

Hopes Daniel Oliver will "sink Atlantis" in his Royal Institution lecture.

Summary

Asa Gray’s anonymous review.

"Intensely interested" in orchid homologies; like a "game of chess".

Summary

CD cannot see the Emperor of Brazil because he is in Southampton, but he sends sincere respects for the Emperor’s role in assisting science.

Summary

Acknowledges note and parcel for Ehrenberg.

Considers why different areas have different numbers of species. Gives an example opposing JDH’s view that paucity of species results from vicissitudes of climate. CD has concluded that species are most numerous in areas that have most often been divided, isolated from, and then reunited with, other areas. Cannot give detailed reasons but believes that "isolation is the chief concomitant or cause of the appearance of new forms".

Summary

On final instalment of "Insular floras" [Gard. Chron. (1867): 75]; rejoices at extent of their agreement.

Some criticisms of JDH’s position on geographical affinities, and volcanic islands.

Summary

Has read a paper, presumably by JDH, using the Madeiran flora to argue against Forbes’s doctrine.

JDH asked how far CD will go in attributing common descent; he intends to show "the facts & arguments for & against the common descent of species of same genus; & then show how far the same arguments tell for or against forms, more & more widely different".