Northcote Whitridge Thomas,
1911 Encyclopædia Britannica, Volume 18…
(1911)
“ MEDIUM, primarily a person through whom, as an intermediate, communication is deemed to be carried on between living men and spirits of the departed, according to the spiritistic hypothesis; such a person is better termed sensitive or automatist. The phenomena of mediumship fall into two classes, (1) “physical phenomena” (q.v.) and (2) trance and automatic phenomena (utterances, script, &c.) ”
