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From J. D. Dana   8 December 1856

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Summary

Agassiz has informed him that the mice and rats of Mammoth Cave are American in type.

Alludes to CD’s doubt of the principle that "progress of life on the globe is parallel with the development in different tribes". Outlines his own ideas on the "unfolding of the type-idea" and its "parallelism with the law of development in the embryo".

Author:  James Dwight Dana
Addressee:  Charles Robert Darwin
Date:  8 Dec 1856
Classmark:  DAR 205.9: 378
Letter no:  DCP-LETT-2016