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From Asa Gray   7 July 1857

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Summary

Believes, with CD, that extinction may be an important factor in explaining plant distributions, but sees no reason why the several species of a genus must ever have had a common or continuous area. "Convince me of that, or show me any good grounds for it … and I think you would carry me a good way with you". It is just such people as AG that CD has to satisfy and convince.

Feels that the crossing of individuals is important in repressing variation and perhaps in perpetuating the species, but instances some plants in which it cannot, apparently, take place.

Author:  Asa Gray
Addressee:  Charles Robert Darwin
Date:  7 July 1857
Classmark:  DAR 205.9: 381; DAR 165: 98
Letter no:  DCP-LETT-2120

Matches: 1 hit

  • … See letter to Asa Gray, 20 July [1857] . J.  D. Hooker and Thomson 1855. Jean Louis …

From Asa Gray   16 February 1857

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Summary

Discusses the ranges of alpine species in U. S. and considers the possible migration routes of such species from Europe.

Lists those U. S. genera which he considers protean and describes the U. S. character of some genera which are protean in Europe.

Describes how he distinguishes introduced and aboriginal stocks of the same species.

Author:  Asa Gray
Addressee:  Charles Robert Darwin
Date:  16 Feb 1857
Classmark:  DAR 165: 96
Letter no:  DCP-LETT-2053

Matches: 1 hit

  • … Asa Gray, 1 January [1857] and n.  6. See letters to J.  D. Hooker, 1 December [1856] and …

From Asa Gray   22 May 1855

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Summary

Has filled up CD’s paper [see 1674].

Distribution and relationships of alpine flora in U. S.

Author:  Asa Gray
Addressee:  Charles Robert Darwin
Date:  22 May 1855
Classmark:  DAR 106: D1–D2
Letter no:  DCP-LETT-1685

Matches: 1 hit

  • … after the third part of volume two. J.  D. Hooker 1857 and 1862. See letter to Asa Gray, …

From Asa Gray   21 June 1858

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Summary

Self-fertilisation in Fumariaceae.

[CD note on bees’ visiting some members of Fumariaceae.]

Author:  Asa Gray
Addressee:  Charles Robert Darwin
Date:  21 June 1858
Classmark:  DAR 76: B15
Letter no:  DCP-LETT-2288

Matches: 1 hit

  • 1857] ). CD investigated the subject experimentally in June 1858 (see n.  2, below). The note forms part of CD’s record of observations made in May and June on the fertilisation of these and similar leguminous flowers by bees. The letter is bound with CD’s other slips and notes on the topic in DAR 76. See also letter to J.  D. Hooker, …
Document type
letter (4)
Author
Addressee
Correspondent
Date
1855 (1)
1857 (2)
1858 (1)