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Darwin Correspondence Project
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From Asa Gray   [early August 1856]

Summary

Believes intermediate varieties are generally less numerous in individuals than the two states that they connect.

Discusses the difficulties of deciding what is the typical form of a species

and gives some opinions on the variability of introduced species compared with indigenous species.

Author:  Asa Gray
Addressee:  Charles Robert Darwin
Date:  [early Aug 1856]
Classmark:  DAR 165: 93
Letter no:  DCP-LETT-1934

From J. S. Henslow   2 August 1856

Summary

One plant in self-sown patch of Aegilops has assumed a triticoidal character; JSH feels it may be an example of Aegilops passing to wheat.

Author:  John Stevens Henslow
Addressee:  Charles Robert Darwin
Date:  2 Aug 1856
Classmark:  DAR 166: 178
Letter no:  DCP-LETT-1936

From J. D. Hooker   4 August 1856

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Summary

JDH’s arguments against transmutation: 1. Plants do not show the confusion he would expect; 2. Under clearly similar physical conditions we do not find same species.

JDH’s argument against migration: commonality of alpine species. Believes migration opposes facts of botanical distribution in Van Diemen’s Land and New Zealand; prefers continental extension theory.

Author:  Joseph Dalton Hooker
Addressee:  Charles Robert Darwin
Date:  4 Aug 1856
Classmark:  DAR 100: 100–4
Letter no:  DCP-LETT-1937

From Bernard Peirce Brent    [after August 1856]

Summary

On his breeding of Jacobin pigeons. How reciprocal crosses to produce mules work among canaries, goldfinches, linnets, and green linnets.

Will soon forward copies of Cottage Gardener for June.

Author:  Bernard Peirce Brent
Addressee:  Charles Robert Darwin
Date:  [after Aug 1856]
Classmark:  DAR 160.2: 298
Letter no:  DCP-LETT-2850
Document type
letter (4)
Addressee
Darwin, C. R.[X]
Date
1856
08
01 (2)
02 (1)
04 (1)
letter