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To Wilhelm Pfeffer   23 March 1879

Summary

Seeks clarification of statements on sleep movements on p. 29 of WFPP’s work [Die periodischen Bewegungen der Blattorgane (1875)].

Author:  Charles Robert Darwin
Addressee:  Wilhelm Friedrich Philipp (Wilhelm) Pfeffer
Date:  23 Mar 1879
Classmark:  Tenri Central Library, Tenri University, Nara
Letter no:  DCP-LETT-11948

From Wilhelm Pfeffer   22 April 1879

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Summary

In response to CD’s query, discusses sleep movements of plants. Recommends papers on subject.

Author:  Wilhelm Friedrich Philipp (Wilhelm) Pfeffer
Addressee:  Charles Robert Darwin
Date:  22 Apr 1879
Classmark:  DAR 209.14: 187
Letter no:  DCP-LETT-12008

From Wilhelm Pfeffer   25 November 1880

Summary

Thanks for Movement in plants.

Describes work [on Pflanzenphysiologie, 2 vols. (1881)].

Author:  Wilhelm Friedrich Philipp (Wilhelm) Pfeffer
Addressee:  Charles Robert Darwin
Date:  25 Nov 1880
Classmark:  DAR 174: 37
Letter no:  DCP-LETT-12856

From Wilhelm Pfeffer   24 October 1881

Summary

Will send 2d vol. [of his Pflanzenphysiologie (1881)].

CD has occasionally misinterpreted him in Movement in plants; by "after-working" (Nachwirkung) he means "after-working of preceding movements", not of the irritating cause [light].

Author:  Wilhelm Friedrich Philipp (Wilhelm) Pfeffer
Addressee:  Charles Robert Darwin
Date:  24 Oct 1881
Classmark:  DAR 174: 38
Letter no:  DCP-LETT-13425

From Wilhelm Pfeffer   6 November 1881

Summary

It is impossible to trace the direct connections between stimuli and responses in plant movements. Disagrees with much of Julius von Wiesner [Die Bewegungsvermögen der Pflanzen (1881)]. Disagrees with CD on induced movements and circumnutation.

Author:  Wilhelm Friedrich Philipp (Wilhelm) Pfeffer
Addressee:  Charles Robert Darwin
Date:  6 Nov 1881
Classmark:  DAR 174: 39
Letter no:  DCP-LETT-13464
Document type
letter (5)
Correspondent
Darwin, C. R.[X]
Pfeffer, Wilhelm[X]
Date
1879 (2)
1880 (1)
1881 (2)
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