From:
Charles Robert Darwin
To:
William James Erasmus (Erasmus) Wilson
Date:
29 Mar [1871]
Source of text:
DAR 96: 99
Summary:
Wonders whether correspondent might possibly know of any cases in which intense concentration of the mind on one portion of the skin produces dilation of the capillary vessels and hence reddening of the area.
Contributor:
Darwin Correspondence Project
