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To Oswald Heer   8 March [1875]

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.

Author:  Charles Robert Darwin
Addressee:  Oswald Heer
Date:  8 Mar [1875]
Classmark:  Zentralbibliothek Zürich (Nachlass Oswald Heer 213.2)
Letter no:  DCP-LETT-9881

From Oswald Heer   28 September 1875

Summary

Comments on Insectivorous plants.

Describes his own work on fossil flora of Eastern Siberia.

Discusses genus Ginkgo.

Author:  Oswald Heer
Addressee:  Charles Robert Darwin
Date:  28 Sept 1875
Classmark:  DAR 166: 132
Letter no:  DCP-LETT-10175

From Oswald Heer   1 March 1875

Summary

Comments on his Flora fossilis Arctica [vol. 3 (1875)]. Discusses successive appearance of plant families in geological periods. Relates plant development to rise of herbivorous mammals.

Comments on death of Charles Lyell.

Author:  Oswald Heer
Addressee:  Charles Robert Darwin
Date:  1 Mar 1875
Classmark:  DAR 166: 130
Letter no:  DCP-LETT-9876

From Oswald Heer   23 March 1875

Summary

Discusses his work [Flora fossilis Arctica, vol. 4, pt 1 (1876)].

Sends copy of [Fossile Pflanzen von Sumatra (1874)]. Comments on climate in Tertiary period, especially on Sumatra.

Comments on theory of Thomas Belt concerning climatic change in ice age.

Author:  Oswald Heer
Addressee:  Charles Robert Darwin
Date:  23 Mar 1875
Classmark:  DAR 166: 131
Letter no:  DCP-LETT-9901
Document type
letter (4)
Addressee
Correspondent
Darwin, C. R.[X]
Heer, Oswald[X]
Date
1875
03 (3)
09 (1)
letter