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Herschel, John in correspondent 
De Morgan, Augustus in correspondent 
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From:
Augustus De Morgan
To:
Sir John Herschel
Date:
[16 January 1857]
Source of text:
RS:HS 6.293
Summary:

Thanks for the magic square, which he is now returning. Seems no end to the possibilities of such squares.

Contributor:
John Herschel Project