This method has been largely practised in the East (where the entity employed is usually a nature-spirit) and in old Atlantis, where "the lords of the dark face" used a highly-specialized and peculiarly venomous variety of artificial elemental for this purpose. Information is sometimes obtained in the same sort of way at the spiritualistic _seance_ of modern days, but in that case the messenger employed is more likely to be a recently-deceased human being functioning more or less freely on the astral plane--though even here also it is sometimes an obliging nature-spirit, who is amusing himself by posing as somebody's departed relative. In any case, as I have said, this method is not clairvoyant at all, but magical; and it is mentioned here only in order that the reader may not become confused in the endeavour to classify cases of its use under some of the following headings. 2. _By means of an astral current._--This is a phrase frequently and rather loosely employed in some of our Theosophical literature to cover a considerable variety of phenomena, and among others that which I wish to explain. What is really done by the student who adopts this method is not so much the setting in motion of a current in astral matter, as the erection of a kind of temporary telephone through it. It is impossible here to give an exhaustive disquisition on astral physics, even had I the requisite knowledge to write it; all I need say is that it is possible to make in astral matter a definite connecting-line that shall act as a telegraph-wire to convey vibrations by means of which all that is going on at the other end of it may be seen. Such a line is established, be it understood, not by a direct projection through space of astral matter, but by such action upon a line (or rather many lines) of particles of that matter as will render them capable of forming a conductor for vibrations of the character required. This preliminary action can be set up in two ways--either by the transmission of energy from particle to particle, until the line is formed, or by the use of a force from a higher plane which is capable of acting upon the whole line simultaneously. Of course this latter method implies far greater development, since it involves the knowledge of (and the power to use) forces of a considerably higher level; so that the man who could make his line in this way would not, for his own use, need a line at all, since he could see far more easily and completely by means of an altogether higher faculty.