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From A. R. Wallace   30 January 1869

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Summary

Argues that [general variability] of species, not single variations or sports, is basis for modification and adaptation to new conditions.

Author:  Alfred Russel Wallace
Addressee:  Charles Robert Darwin
Date:  30 Jan 1869
Classmark:  DAR 106: B75–6
Letter no:  DCP-LETT-6583

From David Forbes   30 January 1869

Summary

DF’s opinion of Gustav Jenzsch’s book [Mikroskopische Flora und Fauna (1868)]. Encloses extract of a letter from Ferdinand Zirkel also mentioning Jenzsch’s work.

Author:  David Forbes
Addressee:  Charles Robert Darwin
Date:  30 Jan 1869
Classmark:  DAR 164: 143–143/2
Letter no:  DCP-LETT-6584