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
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 |
letter | (4) |
Brent, B. P. | (1) |
Gray, Asa | (1) |
Henslow, J. S. | (1) |
Hooker, J. D. | (1) |
Darwin, C. R. | |
Brent, B. P. | (1) |
Gray, Asa | (1) |
Henslow, J. S. | (1) |
Hooker, J. D. | (1) |