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Horner, Leonard in correspondent 
1860-1869 in date 
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From:
Charles Robert Darwin
To:
Leonard Horner
Date:
14 Feb [1861]
Source of text:
American Philosophical Society (Mss.B.D25.)
Summary:

Variations in nature arise from unknown causes, accidentally or spontaneously, and are preserved by natural selection if beneficial.

Contributor:
Darwin Correspondence Project
From:
Charles Robert Darwin
To:
Leonard Horner
Date:
20 Mar [1861]
Source of text:
Sotheby’s (dealers) (9–10 July 2018, lot 374)
Summary:

Comments on LH’s "Anniversary Address of the President", [Q. J. Geol. Soc. Lond. 17 (1861): xxxi–lxxii]. Notes LH’s comments on metamorphism, antiquity of man, and the Bible. Thanks him for his remarks on Origin.

Contributor:
Darwin Correspondence Project
From:
Charles Robert Darwin
To:
Leonard Horner
Date:
13 June [1862]
Source of text:
National Library of Scotland (MS.2216:167)
Summary:

Sends condolences on death of LH’s wife. Recalls many pleasant hours in Bedford Place. He and Emma thank LH for sending the memorial paper.

Contributor:
Darwin Correspondence Project