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Darwin, C. R. in correspondent 
Thwaites, G. H. K. in correspondent 
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DCP-LETT-3550

From:
George Henry Kendrick Thwaites
To:
Charles Robert Darwin
Date:
15 May 1862
Source of text:
DAR 110: B79–80, DAR 171: 3
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].

Contributor:
Darwin Correspondence Project

DCP-LETT-3606

From:
Charles Robert Darwin
To:
George Henry Kendrick Thwaites
Date:
15 June [1862]
Source of text:
American Philosophical Society (Mss.B.D25.278)
Summary:

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

Contributor:
Darwin Correspondence Project

DCP-LETT-3613

From:
Charles Robert Darwin
To:
George Henry Kendrick Thwaites
Date:
20 June [1862]
Source of text:
American Philosophical Society (Mss.B.D25.280)
Summary:

Asks for information concerning heterostyled and dioecious plants.

Contributor:
Darwin Correspondence Project

DCP-LETT-3880

From:
Charles Robert Darwin
To:
George Henry Kendrick Thwaites
Date:
29 Dec [1862]
Source of text:
Cleveland Health Sciences Library (Robert M. Stecher collection)
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.

Contributor:
Darwin Correspondence Project
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