Ennemoser and Schubert believe, that the instinct by which animals seek their food, consists in polarity, but I have met with only two modern theories which pretend to explain the phenomena of presentiment; the one is, that the person is in a temporarily magnetic state, and that the presentiment is a kind of clairvoyance. That the faculty, like that of prophetic dreaming, is constitutional, and chiefly manifested in certain families, is well established; and the very unimportant events, such as visits, and so forth, on which it frequently exercises itself, forbid us to seek an explanation in a higher source. It seems, also, to be quite independent of the will of the subject, as it was in the case of Zschokke, who found himself thus let into the secrets of persons in whom he felt no manner of interest, while, where the knowledge might have been of use to him, he could not command it. The theory of one half of the brain in a negative state, serving as a mirror to the other half, if admitted at all, may answer as well, or better, for these waking presentiments, than for clear-seeing in dreams. But, for my own part, I incline very much to the views of that school of philosophers who adopt the first and more spiritual theory, which seems to me to offer fewer difficulties, while, as regards our present nature, and future hopes, it is certainly more satisfactory. Once admitted that the body is but the temporary dwelling of an immaterial spirit, the machine through which, and by which, in its normal states, the spirit alone can manifest itself, I can not see any great difficulty in conceiving that, in certain conditions of that body, their relations may be modified, and that the spirit may perceive, by its own inherent quality, without the aid of its material vehicle; and, as this condition of the body may arise from causes purely physical, we see at once why the revelations frequently regard such unimportant events. Plutarch, in his dialogue between Lamprius and Ammonius, observes, that if the demons, or protecting spirits, that watch over mankind, are disembodied souls, we ought not to doubt that those spirits, even when in the flesh, possessed the faculties they now enjoy, since we have no reason to suppose that any new ones are conferred at the period of dissolution; for these faculties must be inherent, although temporarily obscured, and weak and ineffective in their manifestations. As it is not when the sun breaks from behind the clouds that he first begins to shine, so it is not when the soul issues from the body, as from a cloud that envelops it, that it first attains the power of looking into the future.