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From William Herbert   [c. 27 June 1839]

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Summary

Rejects necessity of outbreeding and any general law of reversion.

Describes further experiments with Hippeastrum showing greater fertility with foreign pollen than with individual’s own pollen or with pollen from another individual of same species.

Does not believe CD’s questions about reversion can be answered in present state of knowledge.

Author:  William Herbert, dean of Manchester
Addressee:  Charles Robert Darwin
Date:  [c. 27 June 1839]
Classmark:  DAR 185: 67
Letter no:  DCP-LETT-524