From:
Joseph Dalton Hooker
To:
Charles Robert Darwin
Date:
[c. 3 Sept 1844]
Source of text:
DAR 104: 221
Summary:
Suggests there is a direct relation between temperature and abundance of plant species.
Contributor:
Darwin Correspondence Project
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
