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From Joseph Dalton Hooker   [c. April 1851]

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Wants catalogue of small islands that contain peculiar plants. Thinks complete floras of islands in various stages of depression [subsidence] would provide good data.

Author:  Joseph Dalton Hooker
Addressee:  Charles Robert Darwin
Date:  [c. Apr 1851]
Classmark:  DAR 100: 164
Letter no:  DCP-LETT-1382

From J. D. Hooker   [late August – early September 1851]

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James Wilson reports case of salmon hybrids.

Herrings inhabit freshwater lake in Scotland during winter.

JDH will edit juror reports for the Great Exhibition.

Author:  Joseph Dalton Hooker
Addressee:  Charles Robert Darwin
Date:  [late Aug – early Sept 1851]
Classmark:  DAR 205.10: 98
Letter no:  DCP-LETT-1440

From J. D. Hooker   [November 1851]

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Flora of New Zealand.

Reconsidering variability of insular species.

Becoming convinced of the probability that the southern flora is a fragmentary one – all that remains of a great southern continent.

Author:  Joseph Dalton Hooker
Addressee:  Charles Robert Darwin
Date:  [Nov 1851]
Classmark:  DAR 100: 82–5
Letter no:  DCP-LETT-1460

From J. D. Hooker   [4 November 1853]

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Royal Society votes its Royal Medal for 1853 to CD. JDH reports the debate and vote at the Royal Society Council.

Honoured for Coral reefs

and Cirripedia.

Author:  Joseph Dalton Hooker
Addressee:  Charles Robert Darwin
Date:  [4 Nov 1853]
Classmark:  DAR 104: 186–7
Letter no:  DCP-LETT-1539

From J. D. Hooker   [after 11 December 1854]

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List of most anomalous Leguminosae [from George Bentham].

Author:  Joseph Dalton Hooker
Addressee:  Charles Robert Darwin
Date:  [after 11 Dec 1854]
Classmark:  DAR 205.9: 391
Letter no:  DCP-LETT-1546

From J. D. Hooker   [26 February 1854]

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Is relieved his book [Himalayan journals] has been well received and glad he has successfully completed it.

Author:  Joseph Dalton Hooker
Addressee:  Charles Robert Darwin
Date:  [26 Feb 1854]
Classmark:  DAR 100: 86–9
Letter no:  DCP-LETT-1557

From J. D. Hooker   [c. 25 March 1854]

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JDH summarises letter from Humboldt.

JDH answers CD’s questions on glacial action in Himalayas.

Author:  Joseph Dalton Hooker
Addressee:  Charles Robert Darwin
Date:  [c. 25 Mar 1854]
Classmark:  DAR 205.9: 382
Letter no:  DCP-LETT-1559

From J. D. Hooker   [24 June 1854]

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Birth of JDH’s second child.

Asks CD’s view of "highness" and "lowness" in animals. Gives his own for plants; extent of deviation from type, e.g., floral parts deviating from leaf.

Reading B. C. Brodie’s Psychological inquiries [1854].

Author:  Joseph Dalton Hooker
Addressee:  Charles Robert Darwin
Date:  [24 June 1854]
Classmark:  DAR 104: 202–4
Letter no:  DCP-LETT-1572

From J. D. Hooker   [29 June 1854]

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JDH on "highness" of Coniferae: they are genuine Dicotyledons, not a link to cryptogams; that is a geologists’ fallacy. Thus they are highest plants in Carboniferous.

Does not agree with CD’s "elastic" species theory. Long correspondence with Lyell on this.

Author:  Joseph Dalton Hooker
Addressee:  Charles Robert Darwin
Date:  [29 June 1854]
Classmark:  DAR 205.9: 383
Letter no:  DCP-LETT-1576

From J. D. Hooker   25 August 1854

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JDH and F. W. Binney identify Calamites specimens as pith casts. They are cryptogams related to, but higher than, Lycopodiaceae and contradict progression.

Insects found in coal.

Lyell says Stonesfield slate marsupials are actually placentals.

JDH reading Alexander Braun on individuality ["Das Individuum der Pflanze in seinem Verhältniss zur Species", Abh. K. Akad. Wiss. Berlin (Phys. Kl.) (1853): 19–122].

Author:  Joseph Dalton Hooker
Addressee:  Charles Robert Darwin
Date:  25 Aug 1854
Classmark:  DAR 205.9: 384
Letter no:  DCP-LETT-1581

From J. D. Hooker   [6 November 1854]

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Fossil leaves from Disko Island.

JDH to begin working out the botanical geography of the polar sea.

Has not forgotten CD’s request on aberrant species.

Has taken a house on Richmond Hill.

Author:  Joseph Dalton Hooker
Addressee:  Charles Robert Darwin
Date:  [6 Nov 1854]
Classmark:  DAR 205.9: 385
Letter no:  DCP-LETT-1600

From J. D. Hooker   [15 November 1854]

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George Bentham’s list of aberrant plant genera. JDH appended the number of species in each genus according to E. G. Steudel’s catalogue [Nomenclator botanicus (1840–1)] and according to JDH and Bentham.

JDH speculates on effect of splitting Australia longitudinally on distribution; it becomes an argument for new creations.

Author:  Joseph Dalton Hooker
Addressee:  Charles Robert Darwin
Date:  [15 Nov 1854]
Classmark:  DAR 205.9: 386
Letter no:  DCP-LETT-1607

From J. D. Hooker   5 December [1854]

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Bentham’s list of aberrant genera: CD’s worry that he eliminated large genera a priori is half right. He eliminated those large, anomalous genera that virtually constitute natural orders. JDH criticises CD’s tabulations of aberrants.

Difficulty of distinguishing affinity and analogy in plants.

Author:  Joseph Dalton Hooker
Addressee:  Charles Robert Darwin
Date:  5 Dec [1854]
Classmark:  DAR 205.9: 388–90
Letter no:  DCP-LETT-1611

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   [3 November 1854]

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JDH’s contempt for R. I. Murchison.

There is a Cyperus species and a Pteris species endemic to hot volcanoes of Ischia. Why are there no other migrators?

Author:  Joseph Dalton Hooker
Addressee:  Charles Robert Darwin
Date:  [3 Nov 1854]
Classmark:  DAR 104: 214–15
Letter no:  DCP-LETT-1629

From J. D. Hooker   [before 7 March 1855]

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CD’s tabulation of colonists curious but explicable.

Working on Tasmanian flora; contemplating general essay on Australian distribution: Tasmania and Australia same alpine species; Swan River flora very peculiar and quite distinct from New South Wales.

Trying to establish new journal at Linnean.

Author:  Joseph Dalton Hooker
Addressee:  Charles Robert Darwin
Date:  [before 7 Mar 1855]
Classmark:  DAR 104: 216–17
Letter no:  DCP-LETT-1638

From J. D. Hooker   [before 17 March 1855]

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JDH criticises C. J. F. Bunbury’s paper on Madeira [J. Linn. Soc. Lond. (Bot.) 1 (1857): 1–35].

Absence of Ophrys on Madeira suggests to JDH a sequence in creation of groups.

Why are flightless insects common in desert?

Australian endemism.

Author:  Joseph Dalton Hooker
Addressee:  Charles Robert Darwin
Date:  [before 17 Mar 1855]
Classmark:  DAR 104: 210–13
Letter no:  DCP-LETT-1644

From J. D. Hooker   [6–9 June 1855]

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Finds Forbes’s continental theories, migration, and double creation are all unsatisfactory explanations of geographical distribution of plants.

Is currently working on problems of sea transport of plant species.

European plants on Australian Alps only explicable by double creations.

Author:  Joseph Dalton Hooker
Addressee:  Charles Robert Darwin
Date:  [6–9 June 1855]
Classmark:  DAR 100: 90–3
Letter no:  DCP-LETT-1694

From J. D. Hooker   [8 July 1855]

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Australian Leguminosae problem: of 900 species not ten are common to southwest and southeast. No migration; hence either creation or variation.

Himalayan thistles: graded intermediates between large and small English species, "shakes species to their foundations". Similarity of CD’s and his views on species.

Author:  Joseph Dalton Hooker
Addressee:  Charles Robert Darwin
Date:  [8 July 1855]
Classmark:  DAR 104: 192–3
Letter no:  DCP-LETT-1714

From J. D. Hooker   7 May 1856

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Non-endemic Ascension Island plants brought by man, not wind-transported.

Bentham has found intermediates between oxlip and cowslip in Herefordshire.

JDH finds quantity of albumen in seeds is not variable within a species.

Author:  Joseph Dalton Hooker
Addressee:  Charles Robert Darwin
Date:  7 May 1856
Classmark:  DAR 100: 94–5
Letter no:  DCP-LETT-1869
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