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Darwin Correspondence Project
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From Asa Gray   [early August 1856]


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


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



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]


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)
Darwin, C. R.disabled_by_default