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DCP-LETT-776

From:
Charles Robert Darwin
To:
Joseph Dalton Hooker
Date:
[8 Sept 1844]
Source of text:
DAR 114: 17
Summary:

Acknowledges note and parcel for Ehrenberg.

Considers why different areas have different numbers of species. Gives an example opposing JDH’s view that paucity of species results from vicissitudes of climate. CD has concluded that species are most numerous in areas that have most often been divided, isolated from, and then reunited with, other areas. Cannot give detailed reasons but believes that "isolation is the chief concomitant or cause of the appearance of new forms".

Contributor:
Darwin Correspondence Project
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SOMERVILLE158

From:
Augustus De Morgan
To:
Mary Somerville
Date:
8 Sep 1844
Source of text:
MSD 3 / 123, Dep. c. 370, Bod, MS
Summary:

No summary available.

Contributor:
Brigitte Stenhouse

SOMERVILLE281

From:
Augustus De Morgan
To:
John Herschel
Date:
8 Sep 1844
Source of text:
HS 6.207, RS
Summary:

No summary available.

Contributor:
Brigitte Stenhouse

Herschel1369

From:
William Henry Fox Talbot
To:
Sir John Herschel
Date:
[8 September 1844]
Source of text:
RS:HS 17.317
Summary:

Some comments and questions on mathematics.

Contributor:
John Herschel Project

Herschel6922

From:
Augustus De Morgan
To:
Sir John Herschel
Date:
[8 September 1844]
Source of text:
RS:HS 6.207
Summary:

Will send the information to Mary Somerville. Death of Francis Baily is most grievous. Hopes JH will write an obituary. Society has to elect a new president. Regarding his own algebraic papers.

Contributor:
John Herschel Project
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