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To Asa Gray   26 June [1863]

Summary

Thanks AG for references about phyllotaxy

and information on marriage laws.

Has been looking for dimorphism in Phlox and Euonymus.

Has observed the irritability of tendrils of Echinocystis with great interest. Was also struck by the rotating movements of the leading shoots, which he proposes to investigate.

Author:  Charles Robert Darwin
Addressee:  Asa Gray
Date:  26 June [1863]
Classmark:  Gray Herbarium of Harvard University (82)
Letter no:  DCP-LETT-4222
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