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To Thomas Davidson   23 December [1856]

Summary

Asks TWStCD about variation among brachiopods.

Author:  Charles Robert Darwin
Addressee:  Thomas Davidson
Date:  23 Dec [1856]
Classmark:  American Philosophical Society (Mss.B.D25.142)
Letter no:  DCP-LETT-2021

From Thomas Davidson   29 December 1856

Summary

His experience confirms CD’s view that some species and even some genera of Brachiopoda are consistently more variable than others, and that such variable forms are variable in all localities and at all periods. Similarly a species that shows a lack of variability does so at all points in time and space. Discusses the causes of variability. [See Natural selection, p. 106.]

Author:  Thomas Davidson
Addressee:  Charles Robert Darwin
Date:  29 Dec 1856
Classmark:  DAR 162: 116
Letter no:  DCP-LETT-2024
Document type
letter (2)
Correspondent
Darwin, C. R.[X]
Davidson, Thomas[X]
Date
1856
12
23 (1)
29 (1)
letter