It sometimes happens that the visionary state is induced by excessive emotion during which the prophetic faculty is considerably heightened. Some temperaments on the other hand will fall into the clairvoyant condition when engaged in deep thought. The thread of thought seems suddenly to be broken, and there appears a vision wholly unconnected with the subject but a moment ago absorbing the mind. It is as if the soul, while probing the depths of its inner consciousness, comes into contact with the thin partition which may be said to divide the outer world of reason and doubt from the inner world of intuition and direct perception, and breaking through, emerges into the light beyond. In trance there is generally a development of other super-senses, such as clairaudience and psychic touch, as well as clairvoyance. Examples might be multiplied and would but serve to show that the rapport existing between the human soul and the world soul, the individual consciousness and the collective consciousness, is capable of being actively induced by recourse to appropriate means and developed where it exists in latency by means of the crystal, the black concave mirror or other suitable agent. As yet, however, the majority are wholly ignorant of the existence of such psychic faculties, and even those who possess them are conscious of having but an imperfect control of them. As in the case of genius where nature is opening up new centres of activity in the mind, the casual observer notes an eccentricity hardly distinguishable from some incipient forms of insanity; so the development of new psychic faculties is frequently attended by temporary loss of control over the normal brain functions. Loss of memory, hysteria, absent-mindedness, unconscious utterance of thought, illusions, irritability, indifference, misanthropy and similar perversions are not infrequent products of the preliminary stages of psychic development. These, however, will pass away as the new faculty pushes through into full existence. Nature is jealous of her offspring and concentrates the whole of her forces when in the act of generation, and that is the reason of her apparent neglect of powers and functions, normally under her control, while the evolution of a new faculty is in process. Let it be understood therefore that the faculty of clairvoyance or any other super-sense is not to be artificially developed without some cost to those who seek it. "The universe is thine; take what thou wilt, but pay the price," says Emerson. This is the divine mandate. It is not merely a question of the price of a crystal or a mirror, the sacrifice of time, the exercise of patience: it may mean something much more than this. It is a question of the price of a new faculty. What is it worth to you? That is the price you will be required to pay. And with this equation in mind the reader must consider the use to which, when obtained, he will apply his faculty; for the virtue of everything is in its use.