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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) |
Author
| Darwin, C. R. | (1) |
| Hyatt, Alpheus | (1) |
Addressee
| Darwin, C. R. | (1) |
| Hyatt, Alpheus | (1) |
