From:
Charles Robert Darwin
To:
Asa Gray
Date:
11 Aug [1858]
Source of text:
Archives of the Gray Herbarium, Harvard University (42 and 9a)
Summary:
Species migration since the Pliocene. Effect of the glacial epoch. Present geographical distribution, especially similarities of mountain floras, explained by such migration; mountain summits as remnants of a once continuous flora and fauna.
Cross-fertilisation in Fumariaceae.
Contributor:
Darwin Correspondence Project