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To J. D. Hooker 22 October [1864]
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 |