To H. C. Watson [17 July 1861]
Summary
Difficulty of distinguishing varieties and species. Did HCW suggest a printed list that might help?
Polymorphic genera.
| Author: | Charles Robert Darwin |
| Addressee: | Hewett Cottrell Watson |
| Date: | [17 July 1861] |
| Classmark: | DAR 185: 49 |
| Letter no: | DCP-LETT-1616 |
To H. C. Watson [26 August 1855]
Summary
On geographical distribution of plants. Plant systematics and natural classification.
| Author: | Charles Robert Darwin |
| Addressee: | Hewett Cottrell Watson |
| Date: | [26 Aug 1855] |
| Classmark: | DAR 185: 53 |
| Letter no: | DCP-LETT-1750 |
To H. C. Watson [after 10 June 1856]
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.
| Author: | Charles Robert Darwin |
| Addressee: | Hewett Cottrell Watson |
| Date: | [after 10 June 1856] |
| Classmark: | DAR 185: 52 |
| Letter no: | DCP-LETT-1899 |
To H. C. Watson [5–11 January 1860]
Summary
Discusses the possibility of "convergence" occurring; believes it could be only very limited.
| Author: | Charles Robert Darwin |
| Addressee: | Hewett Cottrell Watson |
| Date: | [5–11 Jan 1860] |
| Classmark: | DAR 47: 136a (verso); The University of Edinburgh Centre for Research Collections (Lyell collection Coll-203/A3/5: 77–87) |
| Letter no: | DCP-LETT-2639 |
DCP-LETT-3211A
Summary
Expresses his wish for a discussion of the geographic distribution of closely allied species. [3218.]
| Author: | Charles Robert Darwin |
| Addressee: | Hewett Cottrell Watson |
| Date: | |
| Classmark: | Texas Tech University Library, Lubbock, Texas, tipped into a first edition of Origin (QH365 .O2 1859) |
| Letter no: | DCP-LETT-3211A |
To H. C. Watson 8 [August 1862]
Summary
Asks HCW’s help with his experiments on Lythrum salicaria, for which he needs flowers of the rare Lythrum hyssopifolia.
| Author: | Charles Robert Darwin |
| Addressee: | Hewett Cottrell Watson |
| Date: | 8 [Aug 1862] |
| Classmark: | Archives of the Museum of Comparative Zoology, Ernst Mayr Library, Harvard University (bMs 7.10.2) |
| Letter no: | DCP-LETT-3646 |
To H. C. Watson 28 May [1864]
Summary
Thanks HCW for Lythrum specimens.
CD has at last finished his Lythrum paper. ["Three forms of Lythrum", Collected papers 2: 106–31.]
| Author: | Charles Robert Darwin |
| Addressee: | Hewett Cottrell Watson |
| Date: | 28 May [1864] |
| Classmark: | DAR 185: 51 |
| Letter no: | DCP-LETT-4512 |
