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From J. D. Hooker   [16 November 1856]

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JDH not happy with CD’s explanation of the absence of north temperate forms in the Southern Hemisphere, given his explanation for the spread of sub-arctic forms to the south. [CD’s note is in response to JDH’s criticism.]

Author:  Joseph Dalton Hooker
Addressee:  Charles Robert Darwin
Date:  [16 Nov 1856]
Classmark:  DAR 100: 162–3
Letter no:  DCP-LETT-1622

From J. D. Hooker   9 November 1856

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Summary

JDH approves MS section on geographical distribution.

Never felt so shaky about species before.

His objections to some mechanisms of distribution that CD proposes.

Author:  Joseph Dalton Hooker
Addressee:  Charles Robert Darwin
Date:  9 Nov 1856
Classmark:  DAR 100: 105–10
Letter no:  DCP-LETT-1983

To J. D. Hooker   11–12 November [1856]

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Summary

CD relieved by JDH’s positive response to his MS.

CD continues observations on means of transport.

JDH’s Raoul Island paper [J. Linn. Soc. Lond. (Bot.) 22 (1857): 133–41], showing continuity of vegetation with New Zealand, best evidence yet of continental extension.

Author:  Charles Robert Darwin
Addressee:  Joseph Dalton Hooker
Date:  11–12 Nov [1856]
Classmark:  DAR 114: 181
Letter no:  DCP-LETT-1986

To J. D. Hooker   15 November [1856]

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CD finds JDH’s objections to a mundane cold period significant, and he endeavours to show how they do not rule out mutability.

He is writing on crossing.

Author:  Charles Robert Darwin
Addressee:  Joseph Dalton Hooker
Date:  15 Nov [1856]
Classmark:  DAR 114: 182
Letter no:  DCP-LETT-1989

To J. D. Hooker   18 November [1856]

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Summary

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

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

Author:  Charles Robert Darwin
Addressee:  Joseph Dalton Hooker
Date:  18 Nov [1856]
Classmark:  DAR 114: 183
Letter no:  DCP-LETT-1991

From J. D. Hooker   22 November 1856

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Continued debate on formation of species as a result of retreat from glaciers.

JDH suggests internal powers of species modification, which he knows CD abhors.

Author:  Joseph Dalton Hooker
Addressee:  Charles Robert Darwin
Date:  22 Nov 1856
Classmark:  DAR 100: 111–12
Letter no:  DCP-LETT-1995

To J. D. Hooker   23 November [1856]

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CD, attempting to clarify debate, states more of his position. External conditions cause "mere variability". Formation of species due to selection. Relation of an organism to its associates far more important than external conditions.

Author:  Charles Robert Darwin
Addressee:  Joseph Dalton Hooker
Date:  23 Nov [1856]
Classmark:  DAR 114: 184
Letter no:  DCP-LETT-1997
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