certain individuals--always perceptible to clairvoyants, and lately (it is asserted) to any one who observes the subject through specially prepared chemical screens;[3] of the "light" diffusing itself over the region of the forehead, which certain mesmeric subjects have inwardly perceived,[4] and of the "aura" which may be produced experimentally by means of high-tension electric currents. We must not forget, also, that Christ Himself is called "the light of the world," and that He once made the very significant remark: "If thine eye be single, _thy whole body shall be full of light_." Lastly, it is somewhat significant, it seems to me, that Andrew Jackson Davis used to see the nervous system of the person he was studying, while in the "superior condition," as _light_--as though it were illuminated by some interior glow, or was more or less phosphorescent. (And we know that phosphorus is certainly connected with the activities of the nervous system--even though it be not so intimately as before supposed.) This string of coincidences is at least remarkable; and it will be observed that the "light" is usually associated with nervous centres and nervous activity--for the head, e.g., is certainly the part most highly illumined, as a rule; while it is certainly the seat of the most active self-consciousness. 11. These facts throw an interesting side-light, also, upon another oft-observed phenomenon in psychical research. I refer to the fact that apparitions ("ghosts") are nearly always seen to be clear and distinct as to the head and upper portions of the body, while they taper off to vapour and "filmy nothingness" in the lower limbs, so that often the feet are not visible at all. While this may be due in part to the fact that the observer's attention is not directed to the lower limbs, but more or less centred upon the head and face, it appears to me that there may be another interpretation of the facts, more in accordance with the phenomena above mentioned, which is this: