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From J. D. Hooker   28 October 1844

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Summary

Discusses the connection between climate and vegetation. Believes that an equable climate is unfavourable to increase of species either by importation or modification of existing forms; illustrates his view with reference to particular floras. Hopes to acquire facts to support CD’s idea that isolation is important in producing new forms. Considers the floras of islands some of which do have distinctive species but others of which do not. Agrees that the wide ranges of cryptogams are a consequence of their means of dispersal. Asks for references to works on original creation and species mutability in order to get the best notions of "the (mad) theories of some men from Lamarck’s twaddle upwards".

Author:  Joseph Dalton Hooker
Addressee:  Charles Robert Darwin
Date:  28 Oct 1844
Classmark:  DAR 100: 16–23
Letter no:  DCP-LETT-784
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