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From H. C. Watson   5 June 1856

Summary

Answers CD’s questions about plants common to U. S. and Britain and their distribution in Europe.

Variability of agrarian weeds.

Author:  Hewett Cottrell Watson
Addressee:  Charles Robert Darwin
Date:  5 June 1856
Classmark:  DAR 181: 32
Letter no:  DCP-LETT-1891

From H. C. Watson   10 June 1856

Summary

Evidence relevant to E. Forbes’s land-bridge theory.

Author:  Hewett Cottrell Watson
Addressee:  Charles Robert Darwin
Date:  10 June 1856
Classmark:  DAR 181: 33
Letter no:  DCP-LETT-1898

From H. C. Watson   20 June 1856

Summary

Conveys [? J. T. I. Boswell-]Syme’s opinion of variability of agrarian weeds and ranges of species common to U. S. and W. Europe. The Hispano-Hibernian connection.

Author:  Hewett Cottrell Watson
Addressee:  Charles Robert Darwin
Date:  20 June 1856
Classmark:  DAR 181: 34
Letter no:  DCP-LETT-1907

From H. C. Watson   10 November 1856

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Summary

Greatly interested in CD’s experiments with seeds in salt water [see "Action of sea-water on seeds", Collected papers 1: 264–73]. Believes CD exaggerates the force of the objection, against migration, that seeds tend to sink.

Author:  Hewett Cottrell Watson
Addressee:  Charles Robert Darwin
Date:  10 Nov 1856
Classmark:  DAR 205.3: 296
Letter no:  DCP-LETT-1985

From H. C. Watson   19 November 1856

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Summary

Discusses means of seed transport.

Considers the difficulty of deciding which, if any, botanical species are real.

Author:  Hewett Cottrell Watson
Addressee:  Charles Robert Darwin
Date:  19 Nov 1856
Classmark:  DAR 98: A7–A10
Letter no:  DCP-LETT-1994

From H. C. Watson   26 November 1856

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Summary

Responds to CD’s query on Subularia and Limosella. There are discrepancies among authorities on whether Subularia flowers out of water. Limosella certainly flowers out of water.

Author:  Hewett Cottrell Watson
Addressee:  Charles Robert Darwin
Date:  26 Nov 1856
Classmark:  DAR 207: 19
Letter no:  DCP-LETT-2002

From H. C. Watson   [28 December 1856]

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Summary

Notes on the comparative rarity of intermediate forms between species, and the varying relationships those forms may have to one or both species between which they are intermediate.

Author:  Hewett Cottrell Watson
Addressee:  Charles Robert Darwin
Date:  [28 Dec 1856]
Classmark:  DAR 98: A15–18
Letter no:  DCP-LETT-2023
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