Walter Alison Phillips, 1911 Encyclopædia Britannica, Volume 18… (1911)
“ To Faust himself, somnambulist and medium, Mephistopheles had—according to Kiesewetter—a real existence: he was “the objectivation of the transcendental subject of Faust,” an experience familiar in dreams and, more especially, in the visions of mediums and clairvoyants. He was thus a “familiar spirit,” akin to the “daemon” of Socrates; and if he was also half the devil of theology, half the kobold of old German myth, this was only because such “objectivations” are apt to clothe themselves in forms borrowed from the common stock of ideas current at the time when the seer lives ”
