From:
Charles Robert Darwin
To:
Wilhelm Friedrich Philipp (Wilhelm) Pfeffer
Date:
23 Mar 1879
Source of text:
Tenri Central Library, Tenri University, Nara
Summary:
Seeks clarification of statements on sleep movements on p. 29 of WFPP’s work [Die periodischen Bewegungen der Blattorgane (1875)].
Contributor:
Darwin Correspondence Project