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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:
Charles Robert Darwin
To:
John Scott
Date:
15 Apr [1872]
Source of text:
Transactions of the Hawick Archæological Society (1908): 69
Summary:

JS’s valuable observations on worms in India along with Asa Gray’s in the United States confirm CD’s opinion that worms work in the same way all over the world. Requests further information on the subject.

Contributor:
Darwin Correspondence Project