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1830-1839 in date 
Humboldt, Alexander von in correspondent 
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Faraday0723

From:
Friedrich Wilhelm Heinrich Alexander von Humboldt
To:
Michael Faraday
Date:
28 May 1834
Source of text:
RI MS F1 H07
Summary:

No summary available.

Contributor:
Faraday Project
Text Online

Faraday0749

From:
Michael Faraday
To:
Friedrich Wilhelm Heinrich Alexander von Humboldt
Date:
27 December 1834
Source of text:
TB MS
Summary:

No summary available.

Contributor:
Faraday Project
Text Online

Faraday0751

From:
Friedrich Wilhelm Heinrich Alexander von Humboldt
To:
Michael Faraday
Date:
11 January 1835
Source of text:
RI MS F1 H56
Summary:

No summary available.

Contributor:
Faraday Project
Text Online

Faraday0930

From:
Friedrich Wilhelm Heinrich Alexander von Humboldt
To:
Michael Faraday
Date:
26 July 1836
Source of text:
IEE MS SC 2
Summary:

No summary available.

Contributor:
Faraday Project
Text Online

Faraday0989

From:
Friedrich Wilhelm Heinrich Alexander von Humboldt
To:
Michael Faraday
Date:
22 April 1837
Source of text:
IEE MS SC 2
Summary:

No summary available.

Contributor:
Faraday Project

Herschel10707

From:
Alexander von Humboldt
To:
Sir John Herschel
Date:
[29 May 1838]
Source of text:
RS:HS 10.64
Summary:

Calling his attention to the works of J. C. Poggendorf and Guillaume Weber. Does he know of the ingenious work carried out at the Cape by C. F. Gauss and Weber?

Contributor:
John Herschel Project
Text Online

Faraday1102

From:
Friedrich Wilhelm Heinrich Alexander von Humboldt
To:
Michael Faraday
Date:
20 July 1838
Source of text:
IEE MS SC 2
Summary:

No summary available.

Contributor:
Faraday Project

Herschel10708

From:
Sir John Herschel
To:
Alexander von Humboldt
Date:
[31 July 1838]
Source of text:
RS:HS 10.65 & 21.255
Summary:

Regrets he was unable to meet him when in Hanover. Took no part in Guillaume Weber's operations at the Cape, but has become acquainted with them through Weber's volumes. Has pressed the Admiralty on the necessity of Magnetic Observatories at various places. Regarding AH's observations on the barometer.

Contributor:
John Herschel Project

DCP-LETT-534

From:
Friedrich Wilhelm Heinrich Alexander (Alexander) von Humboldt
To:
Charles Robert Darwin
Date:
18 Sept 1839
Source of text:
DAR 204: 180
Summary:

Praises CD’s Journal of researches and comments on some of CD’s observations and conclusions. Considers volcanic activity and its effect on past climate and changes in climate over time. Discusses glacial phenomena. Believes the climate of the coast of Peru is modified by cold sea-currents.

Contributor:
Darwin Correspondence Project

DCP-LETT-545

From:
Charles Robert Darwin
To:
Friedrich Wilhelm Heinrich Alexander (Alexander) von Humboldt
Date:
1 Nov 1839
Source of text:
Staatsbibliothek zu Berlin – Preußischer Kulturbesitz (Nachl. Alexander von Humboldt, gr. Kasten 4, Nr. 22, Bl. 1–2)
Summary:

Gratified by AvH’s letter.

Sends data on temperature of the sea in the Galapagos, South Pacific, and the Abrolhos Islands.

Contributor:
Darwin Correspondence Project
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