Reports on his work. Relationships of shells found at Steinheim; attempts to elucidate the genesis of different forms.
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The Charles Darwin Collection
The Darwin Correspondence Project is publishing letters written by and to the naturalist Charles Darwin (1809–1882). Complete transcripts of letters are being made available through the Project’s website (www.darwinproject.ac.uk) after publication in the ongoing print edition of The Correspondence of Charles Darwin (Cambridge University Press 1985–). Metadata and summaries of all known letters (c. 15,000) appear in Ɛpsilon, and the full texts of available letters can also be searched, with links to the full texts.
Reports on his work. Relationships of shells found at Steinheim; attempts to elucidate the genesis of different forms.
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.