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From J. J. Weir 31 March 1868
Summary
Sexual behaviour of chaffinches.
Numbers of female linnets in September.
His experiments on brightly coloured larvae [as food], testing A. R. Wallace’s theory.
His observations of a rookery make him wonder whether it may not be more difficult than we think for birds to pair.
| Author: | John Jenner Weir |
| Addressee: | Charles Robert Darwin |
| Date: | 31 Mar 1868 |
| Classmark: | DAR 46.1: 98–101, DAR 84.1: 69–70 |
| Letter no: | DCP-LETT-6074 |
Correspondent
| Darwin, C. R. | (1) |
| Weir, J. J. | (1) |
