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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
Document type
letter (1)
Author
Addressee
Correspondent
Darwin, C. R.[X]
Farn, A. B.[X]
Date
1878 (1)
letter