From:
Charles Robert Darwin
To:
Oswald Heer
Date:
8 Mar [1875]
Source of text:
Zentralbibliothek Zürich (Nachlass Oswald Heer 213.2)
Summary:
Thanks OH for his book [see 9876]; agrees that the sudden appearance of many dicotyledons in the Upper Chalk is a perplexing phenomenon for the evolutionist.
Contributor:
Darwin Correspondence Project