"Let us not be misunderstood. In saying this we are not apologizing for, or palliating fraud or wrong doing, but merely asking for fair and considerate treatment--not hasty, unreasoning condemnation. While it is true that mediumship has many compensations, and the medium who takes pleasure in his work has many pleasant experiences, it is also true that the professional medium is too frequently subjected to treatment which makes his task more difficult and thankless than it need be. The kindly and appreciative treatment which he receives from some sitters is a welcome stimulus, and affords good conditions for the spirits, who are thus enabled to operate to the best advantage." PART VII MEDIUMISTIC CONDITIONS Mediumistic phenomena, i.e., the phenomena by and through which spirits manifest their presence and demonstrate their power, may be broadly classified under two heads, as follows, (1) physical phenomena, and (2) mental phenomena. Physical Phenomena. PHYSICAL PHENOMENA cover a wide range of mediumistic manifestations, among which are movements of tables, the production of "raps," the manifestation of spirit lights, freedom from the effects of fire, the passage of matter through matter, direct writing upon paper or upon slates, direct voices, levitation of the medium, spirit photographs, and the production of the materialized form of the spirit. While in rare cases the spirits may manifest these forms of physical phenomena without the assistance of the medium and the circle, nevertheless as a rule such phenomena are produced by the spirits only through the assistance of a medium, and usually only when there is gathered together a circle. "Psychic Force." Various explanations of the power employed by the spirits, assisted by the medium and by the circle, have been offered by the scientific investigators of the subject. The most generally accepted theory of the western scientists is that the spirits employ what is called the "psychic force" of the medium, often assisted by that drawn from the circle and focused in the medium. The medium is regarded as a psychic storage battery which is freely drawn upon by the manifesting spirit. The degree and character of the manifestations are determined largely by the peculiar quality of the psychic force, the capabilities of the medium, the knowledge and powers of the spirits, and the influence of the sitters. Human Magnetism.