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To Fritz Müller   13 November 1881

Summary

Is experimenting with effect of ammonium carbonate on chlorophyll and roots, but finds the results confusing.

Julius von Wiesner has published a book reinterpreting CD’s observations in Movement in plants [see 13422].

Author:  Charles Robert Darwin
Addressee:  Johann Friedrich Theodor (Fritz) Müller
Date:  13 Nov 1881
Classmark:  The British Library (Loan MS 10 no 56)
Letter no:  DCP-LETT-13481

From J. C. Clutterbuck   13 November 1881

Summary

Describes earthworms moving to the surface to escape moles.

Author:  James Charles Clutterbuck
Addressee:  Charles Robert Darwin
Date:  13 Nov 1881
Classmark:  DAR 161: 181
Letter no:  DCP-LETT-13482