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DCP-LETT-10006

From:
William Adolf Ludwig (William) Marshall
To:
Charles Robert Darwin
Date:
2 June 1875
Source of text:
DAR 171: 48
Summary:

Discusses feather as case of evolutionary atavism.

Will soon publish on siliceous sponges

and the skin of caterpillars.

Contributor:
Darwin Correspondence Project

DCP-LETT-10130

From:
William Adolf Ludwig (William) Marshall
To:
Charles Robert Darwin
Date:
21 Aug 1875
Source of text:
DAR 171: 49
Summary:

Doubts ostrich descended from reptiles. Its ancestors true birds. Of course, all birds descended from reptiles. Compares foetus of birds to that of reptiles.

Contributor:
Darwin Correspondence Project
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