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Gray, Asa in addressee 
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From:
Charles Robert Darwin
To:
Asa Gray
Date:
18 June [1857]
Source of text:
Archives of the Gray Herbarium, Harvard University (9a)
Summary:

Thanks for AG’s remarks on disjoined species. CD’s notions are based on belief that disjoined species have suffered much extinction, which is the common cause of small genera and disjoined ranges.

Discusses out-crossing in plants.

Has failed to meet with a detailed account of regular and normal impregnation in the bud. Podostemon, Subularia, and underwater Leguminosae are the strongest cases against him.

Contributor:
Darwin Correspondence Project