Clairvoyance is soul-sight--the power of the soul to see. It is the state of refined psychic perception. This state increases in lucidity--clearness and power of penetration--in proportion as the activity of the physical senses are reduced below normal action. It is observed to be most effective in the trance state--natural or induced--as in the mesmeric and psychic states. I conclude, then, clairvoyance depends upon the unfolding of the spirit’s perception, and is increased in power as the ascendency of the spirit arises above the activities of the spirit’s corporeal envelope--the body. In proportion to the spirit’s ascendency over the organs and senses of the body, is this psychic gift perfect or imperfect. The large brain or cerebrum is the physical organ of the soul, as the cerebellum is of the physiological brain functions. Mental functions are manifested by the former, and physical functions by the latter. Clairvoyance, as a spiritual faculty, will doubtless have its appropriate organ in the brain. I do not profess to locate that organ. At the same time I have noticed the best clairvoyants are wide and full between the eyes, showing there is a particular fulness of the frontal cerebral lobes, at their juncture at the root of the nose. This may be something more than a mere physiognomic sign. When this sign is accompanied by refinement of organisation, and a fine type of brain, I always look for the possible manifestation of clairvoyance in mesmeric subjects. Some writers are of the opinion clairvoyance is actually soul-sight, more or less retarded in lucidity by the action or activity of the bodily senses. Others believe it to be a state arising from a peculiar highly-strained nervous condition, which induces the state of super-sensitivity or impressionability of the organisation. The first may be termed the spiritual, and the latter the physiological hypothesis. But, as a matter of fact, both conditions are noted. The latter may account for much, and possibly is sufficient to explain much that is called thought-reading--so often mistaken for clairvoyance. It does appear to me that certain peculiar physiological conditions, varying from semi-consciousness to profound trance, are necessary for the manifestation of clairvoyance, even when it takes place in apparently normal life of the possessor.