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From R. S. Bartleet   15 November 1881

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Summary

Has read Earthworms.

Wonders if CD has studied gnats; inquires about their apparently useless hovering over one spot for hours.

Author:  Robert Smith Bartleet
Addressee:  Charles Robert Darwin
Date:  15 Nov 1881
Classmark:  DAR 160: 52
Letter no:  DCP-LETT-13486

To S. H. Vines   15 November 1881

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Summary

More observations of the radicles of germinating seeds of Euphorbia peplus for appearance of milk-tubes.

Comments on J. v. Wiesner’s and W. F. P. Pfeffer’s views and criticism of his experiments.

Author:  Charles Robert Darwin
Addressee:  Sydney Howard Vines
Date:  15 Nov 1881
Classmark:  DAR 185: 77
Letter no:  DCP-LETT-13486A