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To J. D. Hooker   1 August [1857]

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Important issue at stake with new flora calculations: evidence that species are only strongly marked varieties. Planning large-scale survey.

Author:  Charles Robert Darwin
Addressee:  Joseph Dalton Hooker
Date:  1 Aug [1857]
Classmark:  DAR 114: 206, 207
Letter no:  DCP-LETT-2130

To J. D. Hooker   22 August [1857]

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Summary

Tabulation of varieties goes on; very important as it shows the branching of forms. Mentions his principle of divergence.

Author:  Charles Robert Darwin
Addressee:  Joseph Dalton Hooker
Date:  22 Aug [1857]
Classmark:  DAR 114: 208
Letter no:  DCP-LETT-2134

To J. D. Hooker   6 September [1857]

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Summary

Some negative results in variety tabulation survey.

Galls on wild carrot.

Author:  Charles Robert Darwin
Addressee:  Joseph Dalton Hooker
Date:  6 Sept [1857]
Classmark:  DAR 114: 209
Letter no:  DCP-LETT-2137

To J. D. Hooker   11 September [1857]

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Representative species may complicate tabulation of varieties.

Questions for Mr Anderson about horse colouring in Norway.

Has been writing an "audacious little discussion" to show that "organic beings are not perfect, only perfect enough to struggle with their competitors".

Author:  Charles Robert Darwin
Addressee:  Joseph Dalton Hooker
Date:  11 Sept [1857]
Classmark:  DAR 114: 211; DAR 115: 73a
Letter no:  DCP-LETT-2140

To J. D. Hooker   30 September [1857]

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Summary

C. F. Ledebour [Flora rossica (1842–53)] particularly useful for variety tabulation. Results generally favourable.

Additions to Down House.

Last two chapters of MS took six months to write.

Author:  Charles Robert Darwin
Addressee:  Joseph Dalton Hooker
Date:  30 Sept [1857]
Classmark:  DAR 114: 210
Letter no:  DCP-LETT-2148

To J. D. Hooker   20 October [1857]

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Summary

Returns some of the systematics books borrowed from JDH. Will now take on A. P. and Alphonse de Candolle [Prodromus].

Arrangements for a visit.

Author:  Charles Robert Darwin
Addressee:  Joseph Dalton Hooker
Date:  20 Oct [1857]
Classmark:  DAR 114: 212, 222c
Letter no:  DCP-LETT-2156

To J. D. Hooker   [23 October 1857]

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Summary

Return of books.

JDH coming to Down.

Author:  Charles Robert Darwin
Addressee:  Joseph Dalton Hooker
Date:  [23 Oct 1857]
Classmark:  DAR 114: 214
Letter no:  DCP-LETT-2157

To J. D. Hooker   14 [November 1857]

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Summary

Rule that species vary most in larger genera seems universal.

Response to Gardeners’ Chronicle note on "Bees and kidney beans" [Collected papers 1: 275–7].

Author:  Charles Robert Darwin
Addressee:  Joseph Dalton Hooker
Date:  14 [Nov 1857]
Classmark:  DAR 114: 215
Letter no:  DCP-LETT-2170

To J. D. Hooker   21 November [1857]

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Summary

Mrs J. S. Henslow’s illness.

Author:  Charles Robert Darwin
Addressee:  Joseph Dalton Hooker
Date:  21 Nov [1857]
Classmark:  DAR 114: 213
Letter no:  DCP-LETT-2174

From J. D. Hooker   [2 December 1857]

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News of Mrs Henslow’s death.

Studying Impatiens, which bears on CD’s problems. Though genus is endemic to India, with over 100 species, CD will be glad to know they do not run into one another.

Author:  Joseph Dalton Hooker
Addressee:  Charles Robert Darwin
Date:  [2 Dec 1857]
Classmark:  DAR 104: 178–9
Letter no:  DCP-LETT-2178

To J. D. Hooker   4 December [1857]

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Summary

Inquiries on effect of dry heat on temperate plants for glacial chapter.

Author:  Charles Robert Darwin
Addressee:  Joseph Dalton Hooker
Date:  4 Dec [1857]
Classmark:  DAR 114: 216
Letter no:  DCP-LETT-2180

From J. D. Hooker   [6 December 1857]

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Finds CD’s results [of his survey of well-marked varieties from A. P. and Alphonse de Candolle’s Prodromus systematis naturalis regni vegetabilis (1824–73)] "very curious and suggestive". Thinks the Labiatae will present an obstacle to him as it is a very large and distinct order with well-defined species and genera. Would like to see him tackle more volumes of Candolle’s Prodromus, as his case can only be established by evidence from mundane plants. CD should beware of generalising from local species variability. A comparison of C. C. Babington’s and G. Bentham’s [British] Floras [Babington Manual of British botany (1843, 4th ed., 1856); Bentham Handbook of British flora (1858)] would be invaluable. Suggests CD write to Ferdinand Müller and Charles Moore in Australia. Moisture favouring extension of species is important for CD’s view.

Author:  Joseph Dalton Hooker
Addressee:  Charles Robert Darwin
Date:  [6 Dec 1857]
Classmark:  DAR 104: 195–6, DAR 47: 192
Letter no:  DCP-LETT-2181

To J. D. Hooker   9 December [1857]

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Survey of species with well-marked varieties: JDH’s Labiatae case a "great blow", but result is very generally consistent.

Author:  Charles Robert Darwin
Addressee:  Joseph Dalton Hooker
Date:  9 Dec [1857]
Classmark:  DAR 114: 217
Letter no:  DCP-LETT-2182

From J. D. Hooker   [17–23 December 1857]

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Sending more Candolle volumes for survey of species with well-marked varieties.

Has begun his introduction [to Flora Tasmaniae]; will not make generalisations.

J. D. Dana’s pamphlet too metaphysical for JDH.

Author:  Joseph Dalton Hooker
Addressee:  Charles Robert Darwin
Date:  [17–23 Dec 1857]
Classmark:  DAR 104: 194
Letter no:  DCP-LETT-2188

To J. D. Hooker   25 December [1857]

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Summary

Species with marked varieties.

Dana’s pamphlet also too metaphysical for CD.

Natural selection chapter on hybridism completed.

Doubts JDH will resist theory in his introduction to Flora Tasmaniae.

Author:  Charles Robert Darwin
Addressee:  Joseph Dalton Hooker
Date:  25 Dec [1857]
Classmark:  DAR 114: 218
Letter no:  DCP-LETT-2194

To J. D. Hooker   [June 1857]

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Request for Floras of Pacific Islands and Greenland.

Individual variation.

Author:  Charles Robert Darwin
Addressee:  Joseph Dalton Hooker
Date:  [June 1857]
Classmark:  DAR 114: 222b
Letter no:  DCP-LETT-2198
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