From:
Sir William Pole
To:
Sir John Herschel
Date:
[18 March 1869]
Source of text:
RS:HS 14.29
Summary:
Notices in letter of last May JH's postscript about the rate of color blindness occurring to overworked or ill artists, and doubts it becomes di-chromic, but merely a 'weakness' of vision.
Contributor:
John Herschel Project