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To James Croll   24 November 1868

Summary

Comments on glaciers in North America.

Asks if glacial periods have occurred alternately in the Northern and Southern Hemispheres. Relevant to his glacial discoveries in South America: "it would have been an immense relief to my mind if I could have assumed … this". CD wishes to discuss subject in new edition of Origin [5th].

Author:  Charles Robert Darwin
Addressee:  James Croll
Date:  24 Nov 1868
Classmark:  DAR 143: 353
Letter no:  DCP-LETT-6473
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letter (1)
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Darwin, C. R.disabled_by_default
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