nothing whatever to prevent black magicians from supplying communicating "spirits"--as, indeed, they have been known to do. With this class we conclude our survey of the inhabitants of the astral plane. With the reservations specially made some few pages back, the catalogue may be taken as a fairly complete one; but it must once more be emphasized that this treatise claims only to sketch the merest outline of a very vast subject, the detailed elaboration of which would need a lifetime of study and hard work. PHENOMENA. Though in the course of this paper various superphysical phenomena have been mentioned and to some extent explained, it will perhaps before concluding be desirable so far to recapitulate as to give a list of those which are most frequently met with by the student of these subjects, and to show by which of the agencies we have attempted to describe they are usually caused. The resources of the astral world, however, are so varied that almost any phenomenon with which we are acquainted can be produced in several different ways, so that it is only possible to lay down general rules in the matter. Apparitions or ghosts furnish a very good instance of the remark just made, for in the loose manner in which the words are ordinarily used they may stand for almost any inhabitant of the astral plane. Of course psychically developed people are constantly seeing such things, but for an ordinary person to "see a ghost," as the common expression runs, one of two things must happen: either that ghost must materialize, or that person must have a temporary flash of psychic perception. But for the fact that neither of these events is a common one, ghosts would be met with in our streets as frequently as living people. [Sidenote: Churchyard Ghosts.] If the ghost is seen hovering about a grave it is probably the etheric shell of a newly-buried person, though it _may_ be the astral body of a living man haunting in sleep the tomb of a friend; or again, it may be a materialized thought-form--that is, an artificial elemental created by the energy with which a man thinks of himself as present at that particular spot. These varieties would be easily distinguishable one from the other by any one accustomed to use astral vision, but an unpractised person would be quite likely to call them all vaguely "ghosts". [Sidenote: Apparitions of the Dying.] Apparitions at the time of death are by no means uncommon, and are very often really visits paid by the astral form of the dying man just before what we elect to call the moment of dissolution; though here again they are quite likely to be thought-forms called into being by his earnest wish to see some friend once more before he passes into an unfamiliar condition. [Sidenote: Haunted Localities.]