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The John Rylands Library, The University of Manchester in repository 
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From:
Charles Robert Darwin
To:
Henrietta Emma Darwin; Henrietta Emma Litchfield
Date:
16 Feb [1874?]
Source of text:
The John Rylands Library, The University of Manchester
Summary:

On the "doubtful & obscure" subject of marriage of cousins, CD believes, that judging from the analogy of animals, no direct evil would follow from their marriage. He would, however, expect the offspring of unrelated parents to be somewhat superior in size and vigour. The injury from the increase of any bad tendency common to the family seems to CD more to be feared than mere consanguinity; "the good effects of crossing distinct families I look at as great & undoubted".

Contributor:
Darwin Correspondence Project