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Darwin, C. R. in correspondent 
Russell, Arthur in correspondent 
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From:
Arthur John Edward (Arthur) Russell, Lord Arthur Russell
To:
Charles Robert Darwin
Date:
15 Apr 1872
Source of text:
DAR 176: 225
Summary:

Has acquired some French frogs, Rana esculenta, which have mated with R. temporaria, but the spawn has not developed.

Asks whether anyone has successfully crossed frogs and toads.

Contributor:
Darwin Correspondence Project
From:
Arthur John Edward (Arthur) Russell, Lord Arthur Russell
To:
Charles Robert Darwin
Date:
19 May 1873
Source of text:
DAR 176: 226
Summary:

In Variation CD claims there are no distinct races of carp, but AR says that in Germany a peculiar and constant variety of carp has been bred.

Contributor:
Darwin Correspondence Project