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From Robert Hunt   19 July 1855

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.

Author:  Robert Hunt
Addressee:  Charles Robert Darwin
Date:  19 July 1855
Classmark:  DAR 261.11: 17
Letter no:  DCP-LETT-1721

From Robert Hunt   24 July 1855

Summary

Informs CD which colours of glass accelerate germination, lignification, and floriation; advises CD on obtaining such glass and offers his help in any experiments.

Author:  Robert Hunt
Addressee:  Charles Robert Darwin
Date:  24 July 1855
Classmark:  DAR 261.11: 18
Letter no:  DCP-LETT-1730
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letter (2)
Author
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Darwin, C. R.disabled_by_default
Correspondent
Date
1855 (2)