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To J. D. Forbes   [November? 1844]


Believes JDF’s discoveries in the structure of glacier ice will explain the structure of many volcanic masses. Will JDF’s views throw any light on the primary laminated rocks?

Author:  Charles Robert Darwin
Addressee:  James David Forbes
Date:  [Nov? 1844]
Classmark:  Proceedings of the Royal Society of Edinburgh 2 1845: 18)
Letter no:  DCP-LETT-786

To Henry Denny   7 November [1844]


Discusses HD’s information that same species of birds at remote stations have identical parasites. Urges him to investigate N. American land-bird parasites.

Is deeply interested in everything connected with geographical distribution, and the differences between species and varieties.

Author:  Charles Robert Darwin
Addressee:  Henry Denny
Date:  7 Nov [1844]
Classmark:  Cleveland Health Sciences Library
Letter no:  DCP-LETT-787

From J. D. Hooker   8 November 1844



Sends notes on Infusoria for Ehrenberg.

Comments on distribution of species in natural orders that have local distributions. Intermediate forms between species of Lycopodium.

Author:  Joseph Dalton Hooker
Addressee:  Charles Robert Darwin
Date:  8 Nov 1844
Classmark:  DAR 100: 24–5
Letter no:  DCP-LETT-788

To J. D. Hooker   [10–11 November 1844]



Origin of Antarctic brash ice.

Further on case of Lycopodium: does JDH know any genera of plants whose species are variable in one continent but not in another? Discussion on variations between floras as regards species richness, and factors affecting geographical distribution. On species, CD expects "that I shall be able to show even to sound naturalists that there are two sides to the question of the immutability of species; – that facts can be viewed and grouped under the notion of allied species having descended from common stocks". Mentions books and papers for and against species mutability. CD believes past absurd ideas arose from no one’s having approached subject on side of variation under domestication.

Would like to see Clarke’s paper

and would welcome visit from JDH.

Author:  Charles Robert Darwin
Addressee:  Joseph Dalton Hooker
Date:  [10-11 Nov 1844]
Classmark:  DAR 114: 19
Letter no:  DCP-LETT-789

To J. D. Forbes   13 [November 1844]


Mexican specimen of laminated obsidian.

Comments on Forbes’s publication comparing lava streams and glaciers. Mentions ice-action theories of a young German.

Author:  Charles Robert Darwin
Addressee:  James David Forbes
Date:  13 [Nov 1844]
Classmark:  University of St Andrews Special Collections (Papers of J. D. Forbes: msdep7 – Incoming letters 1844, no.65
Letter no:  DCP-LETT-790

From J. D. Hooker   14 November 1844



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.

Author:  Joseph Dalton Hooker
Addressee:  Charles Robert Darwin
Date:  14 Nov 1844
Classmark:  DAR 100: 26–7
Letter no:  DCP-LETT-791

To J. D. Hooker   [18 November 1844]



Would like JDH to visit. Regrets he will not be fit to visit JDH.

Author:  Charles Robert Darwin
Addressee:  Joseph Dalton Hooker
Date:  [18 Nov 1844]
Classmark:  DAR 114: 20
Letter no:  DCP-LETT-792

To Leonard Jenyns   25 [November 1844]


On checks to increase of species and the observations which led him to regard species as mutable in form. Would welcome "at some future time" LJ’s criticism of the "sketch" of his conclusions.

Author:  Charles Robert Darwin
Addressee:  Leonard Jenyns; Leonard Blomefield
Date:  25 [Nov 1844]
Classmark:  Bath Royal Literary and Scientific Institution
Letter no:  DCP-LETT-793

To W. A. Leighton   25 November [1844?–6]


Thanks for procuring cuttings of weeping yew.

Author:  Charles Robert Darwin
Addressee:  William Allport Leighton
Date:  25 Nov [1844-6]
Classmark:  Fraser’s Autographs (dealer) (May 2013)
Letter no:  DCP-LETT-653F

To Susan Darwin   [27 November 1844?]


Sends thanks for money.

Comments on treatment prescribed by his father.

Encloses notes by John Higgins with investment advice. Discusses advisability of investing in farmland in Lincolnshire. Cites advice of Sir John Lubbock concerning purchase of land.

Author:  Charles Robert Darwin
Addressee:  Susan Elizabeth Darwin
Date:  [27 Nov 1844?]
Classmark:  DAR 92: A9–10
Letter no:  DCP-LETT-833

To Adolf von Morlot   28 November [1844]


Mentions his Plutonic view of earth history.

Cites Lyell’s opinions on loess.

CD doubts contemporaneousness of extinct great animals with ice period.

Cites applicability of Forbes’s theory of glacier structure to structure of volcanic obsidian.

CD is falling astern in the geological race for knowledge.

Author:  Charles Robert Darwin
Addressee:  Charles Adolphe Morlot (Adolph von Morlot)
Date:  28 Nov [1844]
Classmark:  Burgerbibliothek Bern, Bern, Switzerland
Letter no:  DCP-LETT-794

From J. D. Hooker   29 November 1844



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

Differences in floras of St Helena and Ascension.

Author:  Joseph Dalton Hooker
Addressee:  Charles Robert Darwin
Date:  29 Nov 1844
Classmark:  DAR 100: 28
Letter no:  DCP-LETT-795
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