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 |
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 |
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 and Archives (Dibner Library of the History of Science and Technology MSS 405 A. Gift of the Burndy Library) |
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 |
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 |
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 |
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 |
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 |
To G. H. K. Thwaites 19 May [1868]
Summary
GHKT should not take more trouble about human expression. Discusses contraction of orbicular muscles in elephants.
Asks about colour of first plumage of breeds of Ceylon fowls in which hens alone are coloured.
Author: | Charles Robert Darwin |
Addressee: | George Henry Kendrick Thwaites |
Date: | 19 May [1868] |
Classmark: | American Philosophical Society (Mss.B.D25.342) |
Letter no: | DCP-LETT-6184 |
To G. H. K. Thwaites 2 September 1868
Summary
Thanks GHKT and S. O. Glenie for information about fowls.
Author: | Charles Robert Darwin |
Addressee: | George Henry Kendrick Thwaites |
Date: | 2 Sept 1868 |
Classmark: | American Philosophical Society (Mss.B.D25.354) |
Letter no: | DCP-LETT-6344 |
To G. H. K. Thwaites 28 September [1868]
Summary
Asks him to thank E. L. Layard for trouble taken.
Says Zoological Society "very foolishly" wants no specimens of domestic varieties [from Ceylon].
Author: | Charles Robert Darwin |
Addressee: | George Henry Kendrick Thwaites |
Date: | 28 Sept [1868] |
Classmark: | American Philosophical Society (Mss.B.D25.343) |
Letter no: | DCP-LETT-6395 |
To G. H. K. Thwaites 26 October [1868]
Summary
Encloses Queries about expression.
Author: | Charles Robert Darwin |
Addressee: | George Henry Kendrick Thwaites |
Date: | 26 Oct [1868] |
Classmark: | American Philosophical Society (Mss.B.D25.335) |
Letter no: | DCP-LETT-6431 |
To G. H. K. Thwaites 29 December 1868
Summary
Discusses experiments in breeding fowls.
Comments on letter from S. O. Glenie [see 6440] concerning the eyes of trumpeting elephants.
Author: | Charles Robert Darwin |
Addressee: | George Henry Kendrick Thwaites |
Date: | 29 Dec 1868 |
Classmark: | American Philosophical Society (Mss.B.D25.358) |
Letter no: | DCP-LETT-6514 |