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From:
Charles Robert Darwin
To:
Ernst Dieffenbach
Date:
6 Apr [1846]
Source of text:
J. A. Stargardt (dealers) (Catalogue 574 11–13 November 1965)
Summary:

On geological works of Tschudi and Buch.

"My health keeps indifferent & I do not suppose I shall ever be a strong man again: everything fatigues me, & I can work but little at my writing: this summer, however, I shall get out my geology of S. America".

"I found Bronn’s Geschichte, which you recommended me, very useful, for references to facts on variation".

Contributor:
Darwin Correspondence Project
From:
Robert Hunt
To:
Sir John Herschel
Date:
[6 April 1846]
Source of text:
RS:HS 10.122
Summary:

Has been pursuing his magnetic experiments with crystals and will be publishing a memoir on them. Comments on these experiment. Is there a difference in the mass of the earth at the poles?

Contributor:
John Herschel Project