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DCP-LETT-11746

From:
Moncure Daniel Conway
To:
Charles Robert Darwin
Date:
18 Nov 1878
Source of text:
DAR 161: 221
Summary:

Invites CD to join the Association of Liberal Thinkers and encloses information on its constitution. Huxley and Tyndall are co-operating.

Contributor:
Darwin Correspondence Project

DCP-LETT-11747

From:
Albert Brydges Farn
To:
Charles Robert Darwin
Date:
18 Nov 1878
Source of text:
DAR 164: 26
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.

Contributor:
Darwin Correspondence Project
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