Whether the man were living or recently dead would make no difference at all, and clairvoyance of the fifth class could at once find him even among the countless millions in the heaven-world, though in that case the man himself would be unconscious that he was under observation. Naturally a seer whose consciousness did not range higher than the astral plane--who employed therefore one of the earlier methods of seeing--would not be able to find a person upon the mental plane at all; yet even he would at least be able to tell that the man sought for was upon that plane, from the mere fact that the striking of the chord as far up as the astral level produced no response. If the man sought be a stranger to the seeker, the latter will need something connected with him to act as a clue--a photograph, a letter written by him, an article which has belonged to him, and is impregnated with his personal magnetism; any of these would do in the hands of a practised seer. Again I say, it must not therefore be supposed that pupils who have been taught how to use this art are at liberty to set up a kind of intelligence office through which communication can be had with missing or dead relatives. A message given from this side to such an one might or might not be handed on, according to circumstances, but even if it were, no reply might be brought, lest the transaction should partake of the nature of a phenomenon--something which could be proved on the physical plane to have been an act of magic. Another question often raised is as to whether, in the action of psychic vision, there is any limitation as to distance. The reply would seem to be that there should be no limit but that of the respective planes. It must be remembered that the astral and mental planes of our earth are as definitely its own as its atmosphere, though they extend considerably further from it even in our three-dimensional space than does the physical air. Consequently the passage to, or the detailed sight of, other planets would not be possible for any system of clairvoyance connected with these planes. It _is_ quite possible and easy for the man who can raise his consciousness to the buddhic plane to pass to any other globe belonging to our chain of worlds, but that is outside our present subject. Still a good deal of additional information about other planets can be obtained by the use of such clairvoyant faculties as we have been describing. It is possible to make sight enormously clearer by passing outside of the constant disturbances of the earth's atmosphere, and it is also not difficult to learn how to put on an exceedingly high magnifying power, so that even by ordinary clairvoyance a good deal of very interesting astronomical knowledge may be gained. But as far as this earth and its immediate surroundings are concerned, there is practically no limitation. CHAPTER V. CLAIRVOYANCE IN SPACE: SEMI-INTENTIONAL.