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DCP-LETT-6472

From:
Charles Robert Darwin
To:
Friedrich Rolle
Date:
24 Nov 1868
Source of text:
Senckenberg Forschungsinstitut und Naturmuseum, Frankfurt (SNG-Archiv: Malakol.: Nachlass Rolle)
Summary:

Thanks for information on fowls.

Glad to see extracts from Blumenbach about sexual differences in fowls.

Contributor:
Darwin Correspondence Project

DCP-LETT-6473

From:
Charles Robert Darwin
To:
James Croll
Date:
24 Nov 1868
Source of text:
DAR 143: 353
Summary:

Comments on glaciers in North America.

Asks if glacial periods have occurred alternately in the Northern and Southern Hemispheres. Relevant to his glacial discoveries in South America: "it would have been an immense relief to my mind if I could have assumed … this". CD wishes to discuss subject in new edition of Origin [5th].

Contributor:
Darwin Correspondence Project
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