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To Alpheus Hyatt   13 February 1877


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].

Discusses polymorphic species.

Surprised that shell form developed from various different progenitors.

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

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

Author:  Charles Robert Darwin
Addressee:  Alpheus Hyatt
Date:  13 Feb 1877
Classmark:  Maryland Historical Society (Alpheus Hyatt Papers MS 1007)
Letter no:  DCP-LETT-10842
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letter (1)
Hyatt, Alpheusdisabled_by_default
Darwin, C. R.disabled_by_default
Hyatt, Alpheusdisabled_by_default