Search: De Morgan, Augustus in addressee 
Herschel, John in correspondent 
1860-1869::1864::04 in date 
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From:
Sir John Herschel
To:
Augustus De Morgan
Date:
[21 April 1864]
Source of text:
RS:HS 24.40
Summary:

Comments on metrification.

Contributor:
John Herschel Project