"This is one of the SIDDIHIS or powers described in the Oriental books as accruing to the man who devotes himself to spiritual development, though the name under which it is there mentioned might not be immediately recognizable. It is referred to as 'the power of making oneself large or small at will,' and the reason of a description which appears so oddly to reverse the fact is that in reality the method by which this feat is performed is precisely that indicated in these ancient books. It is by the use of temporary visual machinery of inconceivable minuteness that the world of the infinitely little is so clearly seen; and in the same way (or rather in the opposite way) it is by enormously increasing the size of the machinery used that it becomes possible to increase the breadth of one's view--in the physical sense as well as, let us hope, in the moral--far beyond anything that science has ever dreamt of as possible for man. So that the alteration in size is really in the vehicle of the student's consciousness, and not in anything outside of himself; and the old Oriental books have, after all, put the case more accurately than have we. I have indicated, though only in the roughest outlines, what a trained student, possessed of full astral vision, would see in the immensely wider world to which that vision introduced him; but I have said nothing of the stupendous change in his mental attitude which comes from the experimental certainty regarding matters of paramount importance. The difference between even the profoundest intellectual conviction, and the precise knowledge gained by direct personal experience, must be felt in order to be appreciated." Now, here at this place, I wish to call the attention of the student to the fact that while the above stated, phenomena strictly belong to the class of "simple clairvoyance," rather than to "space clairvoyance," or "time clairvoyance" respectively, nevertheless the same phenomena may be manifested in connection with that of these other classes of clairvoyance. For instance, in space clairvoyance the trained clairvoyant is able not only to perceive things happening at points far distant, but may also (if highly developed psychically) be able to perceive the details just mentioned as well as if he were at that distant point in person. Likewise, in time clairvoyance, the clairvoyant may exercise the power of magnifying vision regarding the object far distant in time, just as if he were living in that time. So here as elsewhere we find the different classes of phenomena shading and blending into each other. At the best, classifications are useful principally for convenience in intellectual consideration and reasoning.