University of Pennsylvania. Seybert Commission for Investigating Modern Spiritualism, Preliminary Report of the Commission Appointed by the University of Pennsylvania to Investigate…
“ Slade winks rapidly three or four times in a sort of mental abstraction, I suppose, while thinking out an answer, but he always breathes freer when this crisis is passed, and the violent convulsions are over, which attend his hurried writing and the re-turning of the slate. His eyes can now be fixed in turn on each of his sitters, and he can rest a minute or two. (One one occasion I saw the slate as he held it between his index and second finger, his index-finger and thumb held the slate pencil.) ”
