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Letter 10842

Darwin, C. R. to Hyatt, Alpheus

13 Feb 1877

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    Regrets that F. Hilgendorf proved so greatly in error ["Planorbis Multiformis", Monatsber. K. Akad. Wiss. Berlin (1866): 474–504; "Noch einmal Planorbis Multiformis", Z. Dtsch. Geol. Ges. 29 (1877): 50–62].

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    Discusses polymorphic species.

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    Surprised that shell form developed from various different progenitors.

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    Reminds CD of C. Nägeli's conclusions on Hieracium.

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    But still retains belief expressed in first edition of Origin that variation in protean species is neither advantageous nor disadvantageous.

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