Search: Rolle, Friedrich in correspondent 
1860-1869::1868::11 in date 
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From:
Friedrich Rolle
To:
Charles Robert Darwin
Date:
20 Nov 1868
Source of text:
DAR 176: 205
Summary:

Has little information about hens with spurs. Encloses information from Robert Oettel and C. F. Friderich, and from J. F. Blumenbach’s Vergleichende Anatomie [1805]. Recommends various German publications.

Contributor:
Darwin Correspondence Project
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