Summary

Wants references to facts quoted in Variation for an essay he is writing on origin of British cattle.

Summary

Sends CD some Indian corn seeds to demonstrate the extreme effect sometimes producible on progeny by the mutilation of a parent.

Writes of a recent book.

Summary

Comments on GRW’s paper [Rep. BAAS (1843): 65–7; Ann. & Mag. Nat. Hist. 12 (1843): 399–412]. CD says by "link" between any two groups he never understood a half-way link, merely one in a long series. Observes that one cannot have a simple species intermediate between two great families. Criticises GRW’s use of circles to represent groups, which leads to thinking that groups are of equal value.

Summary

Does JDH’s Wahlenbergia confirm CD’s law? Variations of one species assume the character of a distinct but allied species or genus.

Seed-salting: old ones float and germinate.

Owen’s "grand paper" [? J. Proc. Linn. Soc. Lond. (Zool.) 2 (1858): 1–37].

Summary

THH’s term "Pithecoid Man" is a theory in itself.

CD is convinced that his doctrine of a mundane period of glaciation is correct.

Henrietta’s serious illness.

Summary

Captain FitzRoy has no objection to appending advertisement of other works connected with Beagle voyage to CD’s volume [Journal of researches].

Summary

CD’s opinion of Lyell’s Antiquity of man and of Owen’s comment on it.

Disappointed Lyell has not spoken out on species and on man.

Pleasure of new hothouse and the plants JDH supplied for it.

Summary

Asks for copy of CD’s paper ["Ancient glaciers of Caernarvonshire", Collected papers 1: 163–71]. Gathers that drift of Moel Tryfan is glacial.

Believes Glen Roy roads formed later than submergence of Scotland.

Asks CD’s opinion concerning relative chronology of various glacial deposits, particularly a flint tool find in the Ouse River near Bedford.

Summary

His fossil bones are unpacked and some are great treasures. He has some geology to do: R. I. Murchison has lent him a map and asked him to look at a part of the country he has been describing.

Their only protection against having Harriet Martineau as sister-in-law is that she works Erasmus too hard.

Summary

Submits the account of Smith, Elder & Co. for the second number of the second part of the Zoology.

Summary

The fourth number of part one of the Zoology has now been published. The Smith, Elder & Co. account is submitted.

Summary

Thanks for JLGK’s article [see 8331].

CD thinks it a pity that Owen shows so little consideration for the judgment of other naturalists.

Summary

His troubles during the revolution have ended well.

Now plans to investigate geological formations at Rio Negro. Is concerned about the expense but cannot bear to miss seeing "one of the most curious pieces of Geology".

Summary

Presents the Smith, Elder & Co. account for the fourth number now published of the second part of the Zoology.

Summary

They learn from a garbled report in the Times that CD’s specimens have arrived in Cambridge.

William Clift, at Royal College of Surgeons, delighted by CD’s letter about the bones that were sent to Plymouth.

Strange coincidence that Royal College of Surgeons has the front portion and CD has sent home the remainder of a skull, of which a drawing can now be completed.

Other news of family and friends.

Summary

Regularly attends Owen’s lectures. Owen at pains to show groups are not linked. Thus makes Lepidosiren appear fish-like.

GRW thinks embryology will become chief guide to insect classification. But contradictions between classification based on embryological and adult characters do occur.

Summary

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.

Summary

Believes CD’s argument against special creation based on absence of terrestrial mammals on islands isolated before Pliocene era is very strong. However, the absence means Cetacea and bats have not modified towards terrestrial existence. There is similar lack of development of bats and rodents in Australia. Constancy among land shells of Madeira over long period shows that the majority of their species are immutable: a minority of "metamorphic" species maintains the overall number of true species while extinction removes many. Emphasis on the role of extinction discomfits CD’s opponents since the power of generation of new species ought to keep pace. Mentions Ammonite deposits with reference to CD’s comments on their apparent sudden extinction [Origin, pp. 321–2]. Perhaps absence of transmutation on slowly subsiding atolls indicates the slow rate of selective change.

Summary

Sexual differences in bird species and seasonal variation in plumage.

Summary

Returns [Wallace] memorial.

Hopes to be able to send classification paper soon. [See 12935.]