In the subsequent pages the student will perceive the different manifestations of clairvoyant vision classified according to the distinction of Time and Space. Clairvoyant vision may disclose objects, scenes, or persons either near by in space, or far off in space; either existing in present time, in past time, or in future time. Inasmuch as the visions of crystal gazing are merely particular forms of clairvoyant vision, it follows that all of the several above named distinctive forms of vision are manifested in crystal gazing. The vision shown in the crystal may be that of something very near in space, or perhaps very far off in space, or removed in space only a moderate distance. Likewise such vision may be based upon things existing at the present time, or at some period of past time, or at some period of and visions of past, present, or future things, events, persons, scenes--each or all of these manifestations are possible to the clairvoyant vision of the crystal gazer, and pictured in the reflecting surface of the crystal or other shining surface employed by him in his experiments. Direct Clairvoyance. The third of the three general classes of the methods employed to obtain the manifestation of clairvoyant phenomena is that known as Direct Clairvoyance. In this class of methods the clairvoyant directly establishes the en rapport connection with the past or present, near or distant, objects, persons, scenes, or events, by means of raising his or her psychic vibrations so as to become "in tune" with the finer vibrations of Nature, without the aid of the physical objects required in the methods of Psychometry and Crystal Gazing, respectively. Trance Conditions. Many clairvoyants, manifesting their powers by means of the methods of Direct Clairvoyance, produce in themselves the condition of trance, or semi-trance condition. Many students believe that these conditions are absolutely necessary for the production of this kind of phenomena, but they neglect, or are actually unaware of, the fact that many of the highest forms of this class of clairvoyant phenomena are manifested by clairvoyants who are no more in a trance condition, or that of semi-trance, than those following the methods of Psychometry or Crystal Gazing, respectively. All that is required is that the clairvoyant maintain a quiescent mental attitude, shutting out the sounds, sights, and thoughts of the outside world, and concentrating the full attention upon the clairvoyant work before him or her. Some, it is true, pass easily into the semi-trance, or even the full trance condition, but the latter are not absolutely necessary states. Clairvoyant Reverie.