I hope that it is practically unnecessary for me to warn my students against evil practices of this kind--I trust that I have not drawn any students of this class to me. In case, however, that some of you may have been, or may be in the future, tempted to use your psychic powers improperly, in this way, I wish to caution and warn you positively against so doing. Outside of the ordinary morality which should prevent you from taking advantage of another person in this way, I wish to say to you that anyone so misusing psychic or astral powers will inevitably bring down upon his head, sooner or later, certain occult astral forces which will prove disastrous to him. He will become involved in the web of his own making, and will suffer greatly. Never by any means allow yourself to be tempted into indulging in any of the practices of Black Magic, under any form of disguise. You will live to regret it if you do. Employ your powers, when you develop them, for the good of others; or at least, for purely scientific investigation and knowledge. The scientific investigator of this phase of psychic influence, will wish to become acquainted with what the occultists call "the astral tube." In this phase of the phenomena, you manifest upon the astral plane, rather than upon the physical. The astral form of telepathy is manifested, rather than the ordinary form. While there are a number of technical points involved in the production of the astral tube, I shall endeavor to instruct you regarding its creation and use in as plain words as possible, omitting all reference to technical occult details which would only serve to distract your attention and confuse your mind. The advanced occult student will understand these omitted technicalities without being told of them; the others would not know what was meant by them, if mentioned, in the absence of a long stage of preparatory teaching. After all, the theory is not of so much importance to most of you as are the practical working principles. I ask your careful attention to what I have to say in this subject of the astral tube.