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From D. F. Tyler 15 August 1872
Summary
Parallel quotations from Benjamin Franklin and Descent about absorption of heat by different colours; applies to winter and summer plumage of birds.
Reasoning power in dogs.
| Author: | Daniel F Tyler |
| Addressee: | Charles Robert Darwin |
| Date: | 15 Aug 1872 |
| Classmark: | DAR 88: 181–2 |
| Letter no: | DCP-LETT-8472 |
