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From A. B. Farn 18 November 1878
Summary
Discusses colour variations in the geometer moth, Gnophos obscurata. Concludes that the increasing proportion of the darker form is related to the effect of smoke that is blackening the chalk slopes on which they live.
Author: | Albert Brydges Farn |
Addressee: | Charles Robert Darwin |
Date: | 18 Nov 1878 |
Classmark: | DAR 164: 26 |
Letter no: | DCP-LETT-11747 |