Search: 1850-1859 in date 
Darwin, C. R. in correspondent 
Hunt, Robert in correspondent 
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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
From:
Charles Robert Darwin
To:
Robert Hunt
Date:
22 July [1855]
Source of text:
American Philosophical Society (Mss.B.D25.)
Summary:

Mentions RH’s book on light [Researches on light in its chemical relations, 2d ed. (1854)]. Asks about coloured glass used in experiments on plants.

Contributor:
Darwin Correspondence Project
From:
Robert Hunt
To:
Charles Robert Darwin
Date:
24 July 1855
Source of text:
DAR 261.11: 18
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.

Contributor:
Darwin Correspondence Project
From:
Charles Robert Darwin
To:
Robert Hunt
Date:
31 July [1855]
Source of text:
Bonhams (dealers) (28 September 2004)
Summary:

Mentions experiments on plants involving coloured glass. Encloses correspondence from glass maker and asks advice.

Contributor:
Darwin Correspondence Project