: but it may perhaps be possible, without transgressing the limits of
the permissible, to give so much of an idea of them as shall be
sufficient to show in outline how certain phenomena are performed. All
who have much experience of spiritualistic _seances_ at which physical
results are produced must at one time or another have seen evidence of
the employment of practically resistless force in, for example, the
instantaneous movement of enormous weights, and so on; and if of a
scientific turn of mind, they may perhaps have wondered whence this
force was obtained, and what was the leverage employed. As usual in
connection with astral phenomena, there are several ways in which such
work may have been done, but it will be enough for the moment to hint at
four. First, there are great etheric currents constantly sweeping over
the surface of the earth from pole to pole in volume which makes their
power as irresistible as that of the rising tide, and there are methods
by which this stupendous force may be safely utilized, though unskilful
attempts to control it would be fraught with frightful danger.
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