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1840-1849 in date 
Darwin, C. R. in correspondent 
Horner, Leonard in correspondent 
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DCP-LETT-677

From:
Charles Robert Darwin
To:
Leonard Horner
Date:
25 June 1843
Source of text:
American Philosophical Society (Mss.B.D25.31)
Summary:

Sends notes on volcanic islands for LH to read and return.

[Letter could be an inaccurate contemporary copy to which the copyist interpolated details, or a forgery. The address "Down House Orpington Kent" occurs nowhere else.]

Contributor:
Darwin Correspondence Project

DCP-LETT-771

From:
Charles Robert Darwin
To:
Leonard Horner
Date:
29 Aug [1844]
Source of text:
American Philosophical Society (Mss.B.D25.38)
Summary:

Thanks Horner for his letter [about Volcanic islands].

Discusses craters of elevation with respect to the views of Leopold von Buch and Élie de Beaumont. Compares Lyell’s views to those of continental geologists. Mentions reading A. D. d’Orbigny [Voyage dans l’Amérique méridionale (1835–47)].

Encloses note from Emma to Mrs Horner, inviting the Horners to visit Down.

Contributor:
Darwin Correspondence Project

DCP-LETT-993

From:
Charles Robert Darwin
To:
Leonard Horner
Date:
[17 Aug – 7 Sept 1846]
Source of text:
American Philosophical Society (Mss.B.D25.53); DAR 145: 136–7 (enclosure)
Summary:

Discusses proposed survey of Glen Roy. Mentions Glen Roy theories of Agassiz and William Buckland. Includes a memorandum calling for a careful survey of the parallel roads of Glen Roy. Mentions M. A. Bravais ["On the lines of ancient level of the sea in Finmark", Q. J. Geol. Soc. Lond. 1 (1845): 534].

Contributor:
Darwin Correspondence Project

DCP-LETT-977

From:
Charles Robert Darwin
To:
Leonard Horner
Date:
[23 Dec 1846 – Jan 1847]
Source of text:
DAR 145: 138
Summary:

Responds to LH’s comments on South America.

Thinks it unsound to designate a geological epoch after man. Doubts people’s confidence in date of man’s introduction.

Criticises A. D. d’Orbigny’s theory of elevation of the Cordillera.

Lists sections of South America of special interest.

Contributor:
Darwin Correspondence Project

DCP-LETT-1048

From:
Charles Robert Darwin
To:
Leonard Horner
Date:
[Jan 1847]
Source of text:
DAR 145: 139
Summary:

Responds to LH’s comments on South America.

Discusses inclination of lava stream.

Sketches in second edition of Journal of researches more accurate than in first.

Contributor:
Darwin Correspondence Project
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