From:
Charles Robert Darwin
To:
Hugo de Vries
Date:
6 Sept 1879
Source of text:
Artis Library (De Vries 7)
Summary:
Perhaps movement from side to side in plants is caused by the contraction of one side, rather than the expansion of the other.
Sends seeds of Lychnis Githago: he observed the hypocotyledenous stem, not the root, contracting.
Contributor:
Darwin Correspondence Project