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From D. F. Tyler   15 August 1872

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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
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1872 (1)
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