Search: Darwin, C. R. in correspondent 
Forbes, J. D. in correspondent 
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From:
Charles Robert Darwin
To:
James David Forbes
Date:
11 Oct [1844]
Source of text:
University of St Andrews Special Collections (Papers of J. D. Forbes: msdep7 – Incoming letters 1844, no.57)
Summary:

Discusses a specimen of Mexican obsidian with an unusual laminated structure.

Contributor:
Darwin Correspondence Project
From:
Charles Robert Darwin
To:
James David Forbes
Date:
[Nov? 1844]
Source of text:
Proceedings of the Royal Society of Edinburgh 2 1845: 18)
Summary:

Believes JDF’s discoveries in the structure of glacier ice will explain the structure of many volcanic masses. Will JDF’s views throw any light on the primary laminated rocks?

Contributor:
Darwin Correspondence Project
From:
Charles Robert Darwin
To:
James David Forbes
Date:
13 [Nov 1844]
Source of text:
University of St Andrews Special Collections (Papers of J. D. Forbes: msdep7 – Incoming letters 1844, no.65)
Summary:

Mexican specimen of laminated obsidian.

Comments on Forbes’s publication comparing lava streams and glaciers. Mentions ice-action theories of a young German.

Contributor:
Darwin Correspondence Project