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From A. R. Wallace 24 March [1868]
Summary
Returns George Darwin’s criticisms of his notes on sterility and sends further notes in reply. Since there are degrees of sterility between varieties, "is it not probable that natural selection can accumulate these variations?" Varieties that are adapted to new conditions could then survive and form new species without being isolated.
| Author: | Alfred Russel Wallace |
| Addressee: | Charles Robert Darwin |
| Date: | 24 Mar [1868] |
| Classmark: | DAR 106: B61–2, B158–9 |
| Letter no: | DCP-LETT-6045 |
From J. J. Weir 24 March 1868
Summary
Experiments to test Wallace’s theory that brightly coloured caterpillars are rejected by birds. [See Descent 1: 417.]
| Author: | John Jenner Weir |
| Addressee: | Charles Robert Darwin |
| Date: | 24 Mar 1868 |
| Classmark: | DAR 84.1: 65–8 |
| Letter no: | DCP-LETT-6046 |
Document type
| letter | (2) |
Correspondent
| Darwin, C. R. | (2) |
| Wallace, A. R. | (1) |
| Weir, J. J. | (1) |
