The study of nervous diseases has established that even in ordinary somnambulism, as well as in mesmerized somnambulists, the weight of the body seems to be diminished. Professor Perty mentions a somnambulist, Koehler, who when in the water could not sink, but floated. The seeress of Prevorst rose to the surface of the bath and could not be kept seated in it. He speaks of Anna Fleisher, who being subject to epileptic fits, was often seen by the Superintendent to rise in the air; and was once, in the presence of two trustworthy witnesses (two deans) and others, raised two and a half yards from her bed in a horizontal position. The similar case of Margaret Rule is cited by Upham in his _History of Salem Witchcraft_. “In ecstatic subjects,” adds Professor Perty, “the rising in the air occurs much more frequently than with somnambulists. We are so accustomed to consider gravitation as being a something absolute and unalterable, that the idea of a complete or partial rising in opposition to it seems inadmissible; nevertheless, there are phenomena in which, by means of material forces, gravitation is overcome. In several diseases—as, for instance, nervous fever—the weight of the human body seems to be increased, but in all ecstatic conditions to be diminished. And there may, likewise, be other forces than material ones which can counteract this power.” A Madrid journal, _El Criterio Espiritista_, of a recent date, reports the case of a young peasant girl near Santiago, which possesses a peculiar interest in this connection. “Two bars of magnetized iron held over her horizontally, half a metre distant, was sufficient to suspend her body in the air.” Were our physicians to experiment on such levitated subjects, it would be found that they are strongly charged with a similar form of electricity to that of the spot, which, according to the law of gravitation, ought to _attract_ them, or rather prevent their levitation. And, if some physical nervous disorder, as well as spiritual ecstasy produce unconsciously to the subject the same {xxv} effects, it proves that if this force in nature were properly studied, it could be regulated at will.