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From G. H. Darwin   [after 8 January 1876]

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Summary

Provides CD with a method of obtaining a numerical ratio that expresses the superiority in heights of crossed plants to self-fertilised plants.

Author:  George Howard Darwin
Addressee:  Charles Robert Darwin
Date:  [after 8 Jan 1876]
Classmark:  DAR 77: 144–5
Letter no:  DCP-LETT-10349