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To G. H. K. Thwaites   26 March 1877

Summary

Thanks for specimens [of insects].

Wonders whether difference between male and female plays part in fertilisation of fig.

Flowers of Oxalis sensitiva, sent long ago, are trimorphic and cleistogamic.

Author:  Charles Robert Darwin
Addressee:  George Henry Kendrick Thwaites
Date:  26 Mar 1877
Classmark:  American Philosophical Society (Mss.B.D25.508)
Letter no:  DCP-LETT-10913

From G. H. K. Thwaites   28 August 1877

Summary

Thanks for Forms of flowers.

Insects that infest and are parasitic upon the fig fruit.

Author:  George Henry Kendrick Thwaites
Addressee:  Charles Robert Darwin
Date:  28 Aug 1877
Classmark:  DAR 178: 126
Letter no:  DCP-LETT-11119

To George Henry Kendrick Thwaites   10 December 1855

Summary

Mentions seeing GHKT at BAAS meeting at Oxford [1847].

Reports he is working on variation of species. Asks about varieties of pigeons and other poultry, and asks for specimens from Ceylon.

Author:  Charles Robert Darwin
Addressee:  George Henry Kendrick Thwaites
Date:  10 Dec 1855
Classmark:  American Philosophical Society (Mss.B.D25.118)
Letter no:  DCP-LETT-1795

To George Henry Kendrick Thwaites   8 March 1856

Summary

Hopes GHKT will publish on variations in plant species at different elevations. Asks about variations among plants on heights of Ceylon.

Promises to publish on the species question.

Asks for pigeons’ skins from India or Ceylon, and for ducks’ skeletons. Mentions help promised by E. F. Kelaart.

Author:  Charles Robert Darwin
Addressee:  George Henry Kendrick Thwaites
Date:  8 Mar 1856
Classmark:  American Philosophical Society (Mss.B.D25.125)
Letter no:  DCP-LETT-1837

To George Henry Kendrick Thwaites   7 February [1858]

Summary

Thanks GHKT for letter on plant acclimatisation and variation among alpine and lowland forms in Ceylon.

Author:  Charles Robert Darwin
Addressee:  George Henry Kendrick Thwaites
Date:  7 Feb [1858]
Classmark:  American Philosophical Society (Mss.B.D25.150)
Letter no:  DCP-LETT-2211

To George Henry Kendrick Thwaites   31 January [1868]

Summary

Asks GHKT about eyes of screaming elephants.

Author:  Charles Robert Darwin
Addressee:  George Henry Kendrick Thwaites
Date:  31 Jan [1868]
Classmark:  American Philosophical Society (Mss.B.D25.325)
Letter no:  DCP-LETT-2670

From George Henry Kendrick Thwaites   [14 February 1860]

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Summary

Questions how natural selection can explain why some cells remain simple and others are modified into highly complex structures.

Reports on the spread in Ceylon of a recently introduced plant.

Author:  George Henry Kendrick Thwaites
Addressee:  Charles Robert Darwin
Date:  [14 Feb 1860]
Classmark:  DAR 205.4 (Letters)
Letter no:  DCP-LETT-2697

To G. H. K. Thwaites   21 March [1860]

Summary

Is pleased GHKT goes a little way with him.

Has rectified in foreign editions of Origin his omission of an explanation of the failure of many forms to progress;

also has discussion of beauty in MS. Does GHKT really believe Diatomaceae, for instance, were created beautiful so that man, millions of generations later, should admire them through a microscope? CD attributes most of these structures to unknown laws of growth; useful structures are accounted for by natural selection.

Author:  Charles Robert Darwin
Addressee:  George Henry Kendrick Thwaites
Date:  21 Mar [1860]
Classmark:  Smithsonian Libraries (Dibner Library of the History of Science and Technology)
Letter no:  DCP-LETT-2731

To G. H. K. Thwaites   20 October [1860]

Summary

Thanks for fact about ducks in Ceylon. Asks for more information.

Pleased by GHKT’s sentence [about Origin].

Author:  Charles Robert Darwin
Addressee:  George Henry Kendrick Thwaites
Date:  20 Oct [1860]
Classmark:  The New York Public Library. Astor, Lenox and Tilden Foundations. Manuscripts and Archives Division. (Richard John Levy and Sally Waldman Sweet collection: box 2, folder 12)
Letter no:  DCP-LETT-2957

From George Henry Kendrick Thwaites   15 May 1862

Summary

Sends CD a quotation from Plato which anticipates the Origin.

Has been enjoying CD’s paper on dimorphism in the Journal of the Linnean Society ["Two forms of Primula", Collected papers 2: 45–63]. He has found similar structures [see Forms of flowers, pp. 116, 122].

Author:  George Henry Kendrick Thwaites
Addressee:  Charles Robert Darwin
Date:  15 May 1862
Classmark:  DAR 110 (ser. 2): 79–80, DAR 171.1: 3
Letter no:  DCP-LETT-3550

To G. H. K. Thwaites   15 June [1862]

Summary

Refers to his Primula paper [Collected papers 2: 45–63]. Asks GHKT to investigate a similar case in Cinchona.

Author:  Charles Robert Darwin
Addressee:  George Henry Kendrick Thwaites
Date:  15 June [1862]
Classmark:  American Philosophical Society (Mss.B.D25.278)
Letter no:  DCP-LETT-3606

To G. H. K. Thwaites   20 June [1862]

Summary

Asks for information concerning heterostyled and dioecious plants.

Author:  Charles Robert Darwin
Addressee:  George Henry Kendrick Thwaites
Date:  20 June [1862]
Classmark:  American Philosophical Society (Mss.B.D25.280)
Letter no:  DCP-LETT-3613

To G. H. K. Thwaites   29 December [1862]

Summary

Asks for any authentic cases of "sports", which CD calls "bud-variations". Flowers introduced from warmer temperate regions are said to be particularly apt to sport in this way.

CD now has proof that Cinchona is dimorphic and that some dimorphic plants are absolutely sterile with their own-form pollen.

Asks GHKT to examine or send pollen specimens of two Ceylon genera.

Author:  Charles Robert Darwin
Addressee:  George Henry Kendrick Thwaites
Date:  29 Dec [1862]
Classmark:  Cleveland Health Sciences Library (Robert M. Stecher collection)
Letter no:  DCP-LETT-3880

From George Henry Kendrick Thwaites   17 February 1863

Summary

Replies to CD’s letter: dimorphism common in Ceylon Rubiaceae. [See Forms of flowers, p. 286.]

Author:  George Henry Kendrick Thwaites
Addressee:  Charles Robert Darwin
Date:  17 Feb 1863
Classmark:  DAR 109: A94
Letter no:  DCP-LETT-3994

To G. H. K. Thwaites   30 March [1863]

Summary

Thanks GHKT for specimens of Sethia. Discusses functions of their dimorphism for insect fertilisation.

Discusses polymorphism and fertilisation in Lythraceae.

Asks for seed of Limnanthemum.

Describes his interest in galls.

Discusses curious specimens of Gomphia and Lesemia.

Author:  Charles Robert Darwin
Addressee:  George Henry Kendrick Thwaites
Date:  30 Mar [1863]
Classmark:  American Philosophical Society (Mss.B.D25.293)
Letter no:  DCP-LETT-4067

From G. H. K. Thwaites   8 June 1863

Summary

Dimorphism in Linum.

Situation in some of the lower Algae is analogous to that in phaenogams. In some, conjugation occurs between separate filaments, in others between cells of same filament.

Forwards a letter from S. O. Glenie enclosing specimens of Cassia fistula which show the two forms of the anthers.

Author:  George Henry Kendrick Thwaites
Addressee:  Charles Robert Darwin
Date:  8 June 1863
Classmark:  DAR 178: 121–2
Letter no:  DCP-LETT-4208

To G. H. K. Thwaites   29 July [1863]

Summary

Thanks GHKT for Limnanthemum seed.

Comments on his view of algal reproduction.

Discusses flower of Cassia.

Sends photograph of himself.

Author:  Charles Robert Darwin
Addressee:  George Henry Kendrick Thwaites
Date:  29 July [1863]
Classmark:  American Philosophical Society (Mss.B.D25.295)
Letter no:  DCP-LETT-4256

From G. H. K. Thwaites   24 September 1863

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Summary

Sends information on the flowers of Cassia roxburghii; will send flowers of all the species of Cassia for CD to study with a view to discovering the law which operates to bring about the differences.

Author:  George Henry Kendrick Thwaites
Addressee:  Charles Robert Darwin
Date:  24 Sept 1863
Classmark:  DAR 48: 74
Letter no:  DCP-LETT-4303

From G. J. MacCarthy to G. H. K. Thwaites   13 May [1862]

Summary

Sends a transcription of Plato’s Timaeus, sect. 44, but does not think this cosmogony foreshadows Darwinian theory.

Author:  MacCarthy, G. J.
Addressee:  George Henry Kendrick Thwaites
Date:  13 May [1862]
Classmark:  DAR 171: 3
Letter no:  DCP-LETT-5090

To G. H. K. Thwaites   13 February [1868]

Summary

Asks whether mane in male of Macacus silenus protects it from bites or is merely ornamental.

Author:  Charles Robert Darwin
Addressee:  George Henry Kendrick Thwaites
Date:  13 Feb [1868]
Classmark:  American Philosophical Society (Mss.B.D25.341)
Letter no:  DCP-LETT-5872
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letter (31)
Date
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1856 (1)
1858 (1)
1860 (3)
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1863 (5)
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