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From:
Joseph Dalton Hooker
To:
Charles Robert Darwin
Date:
[23] Mar 1845
Source of text:
DAR 100: 41–2
Summary:

JDH recommends Augustin de Saint-Hilaire’s Leçons de botanique [1841]. Relates opinions of European botanists on migration and plant distribution.

Contributor:
Darwin Correspondence Project
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From:
Charles Robert Darwin
To:
Christian Gottfried Ehrenberg
Date:
23 Mar [1845]
Source of text:
Museum für Naturkunde Berlin (MfN/HBSB, N005 NL Christian Gottfried Ehrenberg Nr. 43)
Summary:

Cannot doubt that Atlantic dust comes from Africa. Could Gulf Stream have brought South American organisms to African coast?

Has come to same conclusion as CGE on volcanic origin of Patagonian stone. Formation extends 550 miles.

Could CGE examine Pampas mud to see if Infusoria are freshwater or salt-water? Results would be important.

Contributor:
Darwin Correspondence Project
From:
Thomas I. M. Forster
To:
Sir John Herschel
Date:
[23 March 1845]
Source of text:
RS:HS 7.338
Summary:

How has he fared during the spell of cold weather? What does he think of A. J. Ellis's colored circles? Would like the last two volumes of the R.S.P.T. containing the account of the comet. Encloses some impromptus.

Contributor:
John Herschel Project