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From Alexander von Humboldt   18 September 1839

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.

Author:  Friedrich Wilhelm Heinrich Alexander (Alexander) von Humboldt
Addressee:  Charles Robert Darwin
Date:  18 Sept 1839
Classmark:  DAR 204: 180
Letter no:  DCP-LETT-534

To Alexander von Humboldt   1 November 1839

Summary

Gratified by AvH’s letter.

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

Author:  Charles Robert Darwin
Addressee:  Friedrich Wilhelm Heinrich Alexander (Alexander) von Humboldt
Date:  1 Nov 1839
Classmark:  Staatsbibliothek zu Berlin – Preußischer Kulturbesitz (Nachl. Alexander von Humboldt, gr. Kasten 4, Nr. 22)
Letter no:  DCP-LETT-545
Document type
letter (2)
Date
1839 (2)
letter