From 1920 WT publication "Talking with the Dead":
p. 116 Materializations
"These materializations occur by a power which the demons posess of being able to draw out of the mediums body connected streams of the cells of which her body is composed, and then changing the form of these living cells into any desired appearance. They thus transform the medium into a hideous octopus-like creature, and this is the reason seances occur in a dimly lit room, with the medium in a cabinet, so that the circle of investigators cannot witness the horrible scene as it really is."
p. 123 Demons control mediums by seizing the base of the brain
"The cerebellum of the brain is the power house of the body and it is from this center that the evil spirits seek control over the reasoing faculties, located in the cerebrum, and over the whole body."
p. 126 Heavenly whiskey, dentistry and manure
"According to Sir Oliver Lodge's book 'Raymond', the spirit world is inhabited by spirit beings who have flesh but do not bleed. They wear tweed clothes, drink whiskey and have manure piles."
Food at the proper time.
Splash.