From:
Robert Hunt
To:
Charles Robert Darwin
Date:
19 July 1855
Source of text:
DAR 261.11: 17
Summary:
Discusses how best to simulate the light at a particular point on the earth’s surface using coloured glass; considers sunlight as composed of three "principles", varying in proportion according to latitude, which affect germination, lignification, and floriation.
Contributor:
Darwin Correspondence Project