From:
Charles May
To:
Sir John Herschel
Date:
[23 July 1856]
Source of text:
RS:HS 12.313
Summary:
Recently came across some instructions JH had drawn up for persons who are color blind. Sends a note explaining the work of William Pole on this same subject. Has left the manufactory at Ipswich.
Contributor:
John Herschel Project