Search: Herschel, John in author 
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Herschel, John in correspondent 
Talbot, William Henry Fox in correspondent 
1840-1849::1841::07::25 in date 
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From:
Sir John Herschel
To:
William Henry Fox Talbot
Date:
1841-7-25 or later
Source of text:
RS:HS 17.310b (C: RS:HS 22.92)
Summary:

Expresses reservations about Samuel Brown's work. Apologizes for delay in trying calotype; has done only some vegetable substance trials.

Contributor:
John Herschel Project