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THE MEDIUMS’ BOOK > PART SECOND - SPIRIT-MANIFESTATIONS > CHAPTER VI VISUAL MANIFESTATIONS > Theoretic explanation of Apparitions > 106
106. Another property of the perispirit, resulting from its ethereal nature, is its
power of penetration. No species of matter constitutes an obstacle to its passage; it
penetrates all material bodies as easily as light penetrates transparent ones."* No
enclosure can shut out spirits; they visit the prisoner in his dungeon, as easily as the
inhabitant of the open country.