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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
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