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Humboldt, Alexander von in correspondent 
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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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