THE CONTRAST BETWEEN NATURAL AND ENFORCED RELEASES OF "DOUBLES"
Robert Crookall, The Techniques of Astral Projection, Samuel Weiser, 1977
Table II. Differences observed when "Doubles" are formed under Different Circumstances, i.e., when their release was (a) Natural or (b) Enforced. These differences are readily explicable on the hypothesis that the "Doubles" were Objective, Non-physical Bodies but difficult to explain on the hypothesis that they were merely Mental Images (of Physical bodies). Read upwards.
N.B. A "double" (replica) of the physical body may consist of (1) substance from the vehicle of vitality only (in which case it is simple in nature), or (2) the Soul Body only (ditto), or (3) the Soul Body plus the vehicle of vitality (part, if the person is incarnate, all, if discarnate), in which case it is composite in nature.