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1860-1869::1864 in date 
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Herschel13371

From:
Sir John Herschel
To:
Unidentified
Date:
[1864-1 or later]
Source of text:
TxU:H/L-0602.2; Reel 1089
Summary:

Encloses copy of JH's essay entitled The Yard, the Pendulum, & the Metre... (1863). Speculates on causes for deviation in pendulum measurements. Recommends using torsion gravimeters in 'proposed operation.'

Contributor:
John Herschel Project

Herschel881

From:
Sir John Herschel
To:
Unidentified
Date:
[1864?]
Source of text:
JHS 5.2
Summary:

In response to the gift of a book, JH comments on the philosophy of knowledge, and goes on to say that JH agrees with [John Stuart ?] Mill's rejection of the syllogism as a means of argument. In the postscript, JH comments on the nature of heat.

Contributor:
John Herschel Project

DCP-LETT-4476

From:
Unidentified
To:
Charles Robert Darwin
Date:
29 Apr 1864
Source of text:
DAR 174: 1
Summary:

On rereading the Origin, offers a criticism on two grounds: 1. Blending inheritance; 2. The tendency of species to elude competing species. Also competition within species eliminates the weak and thus preserves the species.

Contributor:
Darwin Correspondence Project

DCP-LETT-4580F

From:
Charles Robert Darwin
To:
Unidentified
Date:
1 Aug [1864-5]
Source of text:
Muséum national d’histoire naturelle, Bibliothèque de Botanique, Paris (Ms CRY 493, fol. 637)
Summary:

Sends a photograph of himself.

Contributor:
Darwin Correspondence Project

Herschel14744

From:
Sir John Herschel
To:
Unidentified
Date:
[1864-11 or later]
Source of text:
TxU:H/M-0935.2; Reel 1083
Summary:

Committee pamphlet expressed incorrect representation of JH's views on changes in British standards of measurement.

Contributor:
John Herschel Project
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