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To Alpheus Hyatt   13 February 1877

Summary

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

From Alpheus Hyatt   January 1877

Summary

Reports on his work. Relationships of shells found at Steinheim; attempts to elucidate the genesis of different forms.

Author:  Alpheus Hyatt
Addressee:  Charles Robert Darwin
Date:  Jan 1877
Classmark:  DAR 166: 357, 359
Letter no:  DCP-LETT-10760
Document type
letter (2)
Addressee
Correspondent
Darwin, C. R.[X]
Hyatt, Alpheus[X]
Date
1877
01 (1)
02 (1)
letter