From:
Charles Robert Darwin
To:
Francis Darwin
Date:
14 July [1878]
Source of text:
DAR 211: 35, 36, 39
Summary:
Asks for list of families of sleeping plants. Believes sleep is merely modified circumnutation at a particular time of day.
Porlieria has had no water for some time but shows no sign of flagging.
Describes the response of Thalia flowers to touch.
Contributor:
Darwin Correspondence Project