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Herschel, John in correspondent 
Hardcastle, Emily in correspondent 
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From:
Emily Hardcastle
To:
Sir John Herschel
Date:
[3 May 1866]
Source of text:
RS:HS 10.156
Summary:

Found the enclosed in a bookseller's shop, found it amusing, and sends it to JH to explain the mystery.

Contributor:
John Herschel Project
From:
Sir John Herschel
To:
Emily Hardcastle
Date:
[4 May 1866]
Source of text:
RS:HS 24.154
Summary:

Comments on EH's 'Magic pictures', which JH said he produced and described in a paper twenty-six years earlier; JH is however unable to explain the process chemically.

Contributor:
John Herschel Project