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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   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
Document type
letter (4)
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Darwin, C. R.disabled_by_default
Thwaites, G. H. K.disabled_by_default
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