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Darwin, C. R. in correspondent 
Herschel, John in addressee 
1840-1849::1848::05 in date 
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Herschel6698

From:
Charles Robert Darwin
To:
Sir John Herschel
Date:
7 May [1848]
Source of text:
RS:HS 6.15
Summary:

Sends his manuscript. P.O. has been unable to trace the missing parcel. Comments on J. B. Elie de Beaumont's method of measuring lava streams; emphasizes the importance of repeated observations. Would like copies of the manual when completed.

Contributor:
John Herschel Project

DCP-LETT-1173

From:
Charles Robert Darwin
To:
John Frederick William Herschel, 1st baronet
Date:
7 May [1848]
Source of text:
The Royal Society (HS6: 15)
Summary:

Sends MS of "Geology" for Manual [Collected papers 1: 227–50]. First parcel lost. Asks JFWH to give advice on an unclear note, translated from Élie de Beaumont, on measuring incline of lava-flows.

Contributor:
Darwin Correspondence Project

Herschel6695

From:
Charles Robert Darwin
To:
Sir John Herschel
Date:
[11 May 1848]
Source of text:
RS:HS 6.12
Summary:

As JH is interested in colors he sends him details of the color changes that the genus Ibla undergoes. Will send him a specimen if desired.

Contributor:
John Herschel Project

DCP-LETT-1175

From:
Charles Robert Darwin
To:
John Frederick William Herschel, 1st baronet
Date:
11 May [1848]
Source of text:
The Royal Society (HS6: 12)
Summary:

Describes colour changes from blue to red in valves of operculum of the cirripede genus Ibla.

Contributor:
Darwin Correspondence Project
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