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To Thomas Davidson 23 December [1856]
Summary
Asks TD 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 |
Addressee
| Darwin, C. R. | (1) |
| Davidson, Thomas | (1) |
