From:
Charles Robert Darwin
To:
Francis Darwin
Date:
2 July [1878]
Source of text:
DAR 211: 32
Summary:
Suggests FD call on Carl Semper.
Inquires about Porlieria: Do the leaves shut to check evaporation? Does it appear silver under water?
Explains how he thinks the pulvinus acts; wishes FD would investigate the point.
Contributor:
Darwin Correspondence Project