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Herschel, John in correspondent 
Billet, M. Felix in correspondent 
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From:
M. Felix Billet
To:
Sir John Herschel
Date:
[2 February 1859]
Source of text:
RS:HS 5.63
Summary:

Sending his work on optics. Comments on their mutual work in this field.

Contributor:
John Herschel Project
From:
Sir John Herschel
To:
M. Felix Billet
Date:
[6 February 1859]
Source of text:
RS:HS 5.64 & 23.255
Summary:

Thanks for his book on optics. Comments on various points.

Contributor:
John Herschel Project