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* direct »Letter 82 — Darwin, C. R. to Fox, W. D., 25 [Aug 1830]
Has been in N. Wales two weeks, having gone with Hope and two Eytons. Not many good insects; disillusioned with Hope, found him egotistical and stupid. Hopes WDF will stay in Cambridge until after CD arrives.Some entomological news.
* direct »Letter 251 — Darwin, C. R. to Henslow, J. S., 24 July & 28 Oct & 7 Nov 1834
CD is excited by JSH's high opinion of his collections. Discusses his notes and some new discoveries. Summary of events since leaving Falklands. Geology of Patagonia. Corallines at Tierra del Fuego convince him of artificiality of arrangement of their families by Lamarck and Cuvier. Geological expedition in Andes, ending with serious illness. Specimens being sent.
* direct »Letter 424 — Darwin, C. R. to Lyell, Charles, 9 Aug [1838]
Comments on receiving copy of Lyell's Elements [of geology]. Much is new to CD, and he is copying out notes and references. Criticises geological work of John Phillips. Describes expedition to Glen Roy, about which he is writing a paper ["Parallel roads of Glen Roy" (1839), Collected papers 1: 87–137]. Enjoys the Athenaeum Club.Criticises entomological work of F. W. Hope. Asks Lyell to obtain for him a copy of barometric readings made at Leith. Asks him to ascertain altitude of several Scottish lochs.Comments on FitzRoy's character.
* direct »Letter 428 — Darwin, C. R. to Lyell, Charles, [14] Sept [1838]
Comments on an article in Edinburgh Review [by David Brewster, 67 (1838): 271–308] on Comte's Philosophie positive. Discusses falsity of Élie de Beaumont's views of contemporaneous parallel lines of elevation and subsidence. Owen's views of relationship of reptiles to birds. On "question of species" CD has filled notebook after notebook with facts, "which begin to group themselves clearly under sub-laws".
* direct »Letter 627 — Darwin, C. R. to Jenyns, Leonard, [May–Sept 1842]
Glad to hear that LJ will repeat his notes to Gilbert White's [Natural history of] Selborne [1843] in a separate work. Critical of G. R. Gray's attaching his own name to Furnarius cunicularius [in Birds, pp. 65–6]. Strickland's nomenclature laws are needed to check egoism.
* direct »Letter 680a — Darwin, C. R. to Dieffenbach, Ernst, 4 July [1843]
CD gratified that ED wants to translate his Journal. Will send a copy of Coral reefs, which contains a fuller treatment of topic. Perhaps ED would insert a note to this effect. Can lend woodcuts from Coral reefs if ED wants. CD will send a few corrections; he wants to amend way he criticised Agassiz's glacier theory. He is also enclosing a questionnaire concerning differences between races or varieties and species, about which he intends to publish sometime.
* direct »Letter 829 — Orbigny, A. C. V. D. d' to Darwin, C. R., 14 Feb 1845
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.
* direct »Letter 853 — Ehrenberg, C. G. to Darwin, C. R., 8 Apr 1845
Discusses table of Atlantic dust samples. Thinks dust came from South America. Discusses Patagonian tuff samples. Answers CD's query about material from Pampas. Believes deposit made in brackish water. Criticises account of Atlantic dust in F. J. F. Meyen [Reise um die Erde (1834–5)].
* direct »Letter 901 — Lyell, Charles to Darwin, C. R., [after 2 Aug 1845]
CD's criticism of his book [Travels in North America (1845)]. Compares invertebrate animals of Tasmania and England. Mentions views of C. J. F. Bunbury on climate of the Carboniferous period. Robert Brown says Australian flora has the widest range.
* direct »Letter 905 — Darwin, C. R. to Lyell, Charles, 25 Aug [1845]
Discusses the power of land covered with snow to radiate heat. Criticises CL's discussion of slavery [in Travels in North America (1845)]. A review of CL's book is in Gardeners' Chronicle. Mentions John Lindley's views on carbonic acid gas and extinction; refers to the discussion of multiple and single creations in Humboldt's Kosmos. The origin of volcanic craters of elevation. There is a popular demand for a new edition of Principles. Praises palaeobotanical work of C. J. F. Bunbury.