Letter 10591
Darwin, C. R. to Saporta, L. C. J. G. de
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Hopes GdeS will publish on subjects discussed in his letter [10587]. CD had noted similar persistence of variation in fossil shells.
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Calls his attention to Nägeli's work on Hieracium.
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Expresses skepticism about O. Heer's view that dicotyledonous plants developed suddenly. Believes they must have developed slowly in some part of the globe completely isolated from other regions.