From:
John Dalton
To:
Sir John Herschel
Date:
[1832?]
Source of text:
TxU:H/M-1187; Reel 1060
Summary:
Answers JH's queries on visual perception. Describes trials conducted by JD. Concludes that many people see as JD sees. Sends colored silks submitted by [Richard] Potter to test color vision.
Contributor:
John Herschel Project