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To William Herbert   26 June 1839

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Summary

CD is led to believe there are no true permanently inbreeding, sexually reproducing beings. Thanks for replies to breeding questions.

Asks for clarification of Hippeastrum crosses: is selfing or crossing with individual of same species intended and was increased fertility due to constitution of foreign parent or due to the pollen coming from another plant? Has WH known any hybrid or mongrel to revert or to vary in a manner unlikely to be effect of soil?

Sends Journal of researches.

Author:  Charles Robert Darwin
Addressee:  William Herbert, dean of Manchester
Date:  26 June 1839
Classmark:  DAR 185: 65–6
Letter no:  DCP-LETT-523
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