5. _By travelling in the mental body._--This is simply a higher and, as it were, glorified form of the last type. The vehicle employed is no longer the astral body, but the mind-body--a vehicle, therefore, belonging to the mental plane, and having within it all the potentialities of the wonderful sense of that plane, so transcendent in its action yet so impossible to describe. A man functioning in this leaves his astral body behind him along with the physical, and if he wishes to show himself upon the astral plane for any reason, he does not send for his own astral vehicle, but just by a single action of his will materializes one for his temporary need. Such an astral materialization is sometimes called the mayavirupa, and to form it for the first time usually needs the assistance of a qualified Master. The enormous advantages given by the possession of this power are the capacity of entering upon all the glory and the beauty of the higher land of bliss, and the possession, even when working on the astral plane, of the far more comprehensive mental sense which opens up to the student such marvellous vistas of knowledge, and practically renders error all but impossible. This higher flight, however, is possible for the trained man only, since only under definite training can a man at this stage of evolution learn to employ his mental body as a vehicle. Before leaving the subject of full and intentional clairvoyance, it may be well to devote a few words to answering one or two questions as to its limitations, which constantly occur to students. Is it possible, we are often asked, for the seer to find any person with whom he wishes to communicate, anywhere in the world, whether he be living or dead? To this reply must be a conditional affirmative. Yes, it is possible to find any person if the experimenter can, in some way or other, put himself _en rapport_ with that person. It would be hopeless to plunge vaguely into space to find a total stranger among all the millions around us without any kind of clue; but, on the other hand, a very slight clue would usually be sufficient. If the clairvoyant knows anything of the man whom he seeks, he will have no difficulty in finding him, for every man has what may be called a kind of musical chord of his own--a chord which is the expression of him as a whole, produced perhaps by a sort of average of the rates of vibration of all his different vehicles on their respective planes. If the operator knows how to discern that chord and to strike it, it will by sympathetic vibration attract the attention of the man instantly wherever he may be, and will evoke an immediate response from him.