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DCP-LETT-10760

From:
Alpheus Hyatt
To:
Charles Robert Darwin
Date:
Jan 1877
Source of text:
DAR 166: 357, 359
Summary:

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

Contributor:
Darwin Correspondence Project

DCP-LETT-10842

From:
Charles Robert Darwin
To:
Alpheus Hyatt
Date:
13 Feb 1877
Source of text:
Maryland Historical Society (Alpheus Hyatt Papers MS 1007)
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.

Contributor:
Darwin Correspondence Project
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