From:
Charles Robert Darwin
To:
Hewett Cottrell Watson
Date:
[26 Aug 1855]
Source of text:
DAR 185: 53
Summary:
On geographical distribution of plants. Plant systematics and natural classification.
Contributor:
Darwin Correspondence Project
From:
Charles Robert Darwin
To:
Hewett Cottrell Watson
Date:
[after 10 June 1856]
Source of text:
DAR 185: 52
Summary:
Do the plants that are common to Europe and North America nearly all live north of the Arctic Circle? CD bases his question on HCW’s "capital" comparison between relations of Europe to North America and Europe to E. Asia if the intervening land had been submerged. CD has been led to speculate that in the mid-Pliocene the organisms now living in middle Europe and northern U. S. lived within the Arctic Circle. Subsequent movements of this flora with advance and retreat of glaciers would explain present distribution better than Forbes’s vast submergences.
Contributor:
Darwin Correspondence Project
From:
Charles Robert Darwin
To:
Hewett Cottrell Watson
Date:
[5–11 Jan 1860]
Source of text:
DAR 47: 136a (verso); The University of Edinburgh Centre for Research Collections (Lyell collection Coll-203/A3/5: 77–87)
Summary:
Discusses the possibility of "convergence" occurring; believes it could be only very limited.
Contributor:
Darwin Correspondence Project
From:
Charles Robert Darwin
To:
Hewett Cottrell Watson
Date:
[17 July 1861]
Source of text:
DAR 185: 49
Summary:
Difficulty of distinguishing varieties and species. Did HCW suggest a printed list that might help?
Polymorphic genera.
Contributor:
Darwin Correspondence Project
From:
Charles Robert Darwin
To:
Hewett Cottrell Watson
Date:
8 [Aug 1862]
Source of text:
Archives of the Museum of Comparative Zoology, Ernst Mayr Library, Harvard University (bMs 7.10.2)
Summary:
Asks HCW’s help with his experiments on Lythrum salicaria, for which he needs flowers of the rare Lythrum hyssopifolia.
Contributor:
Darwin Correspondence Project
From:
Charles Robert Darwin
To:
Hewett Cottrell Watson
Date:
28 May [1864]
Source of text:
DAR 185: 51
Summary:
Thanks HCW for Lythrum specimens.
CD has at last finished his Lythrum paper. ["Three forms of Lythrum", Collected papers 2: 106–31.]
Contributor:
Darwin Correspondence Project
