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Letter 9476

Darwin, C. R. to Saporta, L. C. J. G. de

30 May 1874

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    Thanks GdeS for his "Études sur la végétation" [Ann. Sci. Nat. (Bot.) 5th ser. 15 (1872): 277–315]. "Nothing can be more important . . . than your evidence of the extremely slow and gradual manner in which specific forms change."

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    Hopes GdeS will shed light on whether polymorphic forms like Rubus and Hieracium are generating new species at present; CD doubts this.

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