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To J. D. Hooker   [8 September 1844]



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".

Author:  Charles Robert Darwin
Addressee:  Joseph Dalton Hooker
Date:  [8 Sept 1844]
Classmark:  DAR 114: 17
Letter no:  DCP-LETT-776