From:
Sir John Herschel
To:
Charles May
Date:
[1832-11-23 or earli
Source of text:
TxU:H/L-0254 & -0255; Reel 1054
Summary:
Sends set of experimental spectacles for CM to use in testing persons for color-blindness, or 'Dichromic Vision.' Proposes several tests to be conducted with these.
Contributor:
John Herschel Project