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From J. D. Dana   8 December 1856



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

To James Dwight Dana   21 December [1856]


Thanks for sending paper on geological development (Dana 1856). Discusses infertility of species. Discusses first part of Asa Gray’s paper (A. Gray 1856–7). Thanks for note on the Cave Rat. Discusses a new species of fossil cirripede, in the genus Chthamalus. Explains his interest in pigeon breeding.

Author:  Charles Robert Darwin
Addressee:  James Dwight Dana
Date:  21 Dec [1856]
Classmark:  Catherine Barnes (dealer) (2003)
Letter no:  DCP-LETT-2020F
Document type
letter (2)