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To J. D. Hooker   22 October [1864]

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Summary

To Lyell’s chagrin, CD has come round again to A. C. Ramsay’s glacial theory.

On primrose and cowslip, CD maintains they are good species, notwithstanding Scott’s work.

CD defines species by power of remaining constant for a good long time and showing appreciable amount of difference from close species.

Author:  Charles Robert Darwin
Addressee:  Joseph Dalton Hooker
Date:  22 Oct [1864]
Classmark:  DAR 115: 252
Letter no:  DCP-LETT-4642