It was this remarkable experience which led Baron Reichenbach to verify it by leading one of his sensitive patients, a Miss Reichel, at night to the great cemetery of Vienna. As soon as she reached the place she perceived everywhere a sea of flames, brightest over the new graves, weaker over others, and quite faint here and there. In a few cases these lights reached a height of nearly four feet, but generally they had more the appearance of luminous mists, so that her hand, held over the place where she saw one, seemed to be enveloped in a cloud of fire. She was in no way troubled by the phenomena, which she had often previously observed, and Baron Reichenbach thought he saw in them a confirmation of his theory about the Od-light. There can be, however, little doubt that the luminous appearance, perceptible though it be only to unusually sensitive persons, is the result of chemical decomposition, which has a peculiar influence over these persons. Hence, no doubt, the numerous accounts of will-o'-the-wisps and ghostly lights seen in graveyards; the frightened beholder is nearly always laughed at or heartily abused, and more than one poor child has fallen a victim to the absurd theory of "curing it of foolish fears." There can be no doubt that light does appear flickering above churchyards, and that there is something more than mere idle superstition in the "corpse-candles" of the Welsh and in the "elf-candles" of the Scotch, which are seen, with foreboding weight, in the house of sickness, betokening near dissolution. At the same time, it is well known that living persons also have, under certain circumstances, given out light, and especially from their head. The cases of Moses, whose face shone with unbearable brightness, and of the martyr Stephen, are familiar to all, and the halo with which artists surround the heads of saints bears eloquent evidence of the universal and deeply-rooted belief. But science also has fully established the fact that light appears as a real and unmistakable luminous efflux from the human body, alike in health and in mortal sickness. By far the most common case of such emission of light is the emission of sparks from the hair when combed. Before and during the electrical "dust-storms" in India, this phenomenon is of frequent occurrence in the hair of both sexes. In dry weather, and when the hair also is dry, and especially immediately before thunderstorms, the same sparks are seen in all countries. Dr. Phipson mentions the case of a relative of his, "whose hair (exactly one yard and a quarter long), when combed somewhat rapidly with a black gutta-percha comb, emits sheets of light upward of a foot in length," the light being "composed of hundreds of small electric sparks, the snapping noise of which is distinctly heard."