From:
William Henry Fox Talbot
To:
Sir John Herschel
Date:
[11 February 1839]
Source of text:
RS:HS 17.282
Summary:
Wants to withhold description of 'developing' process until it is perfected to obviate others using it. Also refers to second process to make 'positive' and 'negative.'
Contributor:
John Herschel Project