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Biot, Jean Baptiste in author 
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From:
Jean Baptiste Biot
To:
Sir John Herschel
Date:
[6 May 1820]
Source of text:
RS:HS 4.88
Summary:

Has received his letter written in November a little late. Observations on refraction and allied subjects.

Contributor:
John Herschel Project
From:
Jean Baptiste Biot
To:
Sir John Herschel
Date:
[26 September 1820]
Source of text:
RS:HS 4.89
Summary:

Further information on his experiments with refraction in various crystals, especially topaz.

Contributor:
John Herschel Project