Aristotle maintains that this gas, or astral emanation, escaping from inside the earth, is the sole _sufficient cause_, acting from within outwardly for the vivification of every living being and plant upon the external crust. In answer to the skeptical negators of his century, Cicero, moved by a just wrath, exclaims: “And what can be more divine than the exhalations of the earth, which affect the human soul so as to enable her to predict the future? And could the hand of time evaporate such a virtue? Do you suppose you are talking of some kind of wine or salted meat?”[329] Do modern experimentalists claim to be wiser than Cicero, and say that this eternal force has evaporated, and that the springs of prophecy are dry? All the prophets of old—inspired sensitives—were said to be uttering their prophecies under the same conditions, either by the direct outward efflux of the astral emanation, or a sort of damp fluxion, rising from the earth. It is this astral matter which serves as a temporary clothing of the souls who form themselves in this light. Cornelius Agrippa expresses the same views as to the nature of these phantoms by describing it as moist or humid: “_In spirito turbido_ HUMIDOQUE.”[330] Prophecies are delivered in two ways—consciously, by magicians who are able to look into the astral light; and unconsciously, by those who {201} act under what is called inspiration. To the latter class belonged and belong the Biblical prophets and the modern trance-speakers. So familiar with this fact was Plato, that of such prophets he says: “No man, when in his senses, attains prophetic truth and inspiration ... but only when demented by some distemper or possession ...” (by a daimonion or spirit).[331] “Some persons call them prophets; they do not know that they are only _repeaters_ ... and are not to be called prophets at all, but only _transmitters_ of vision and prophecy,“he adds. In continuation of his argument, Mr. Cox says: “The most ardent spiritualists practically admit the existence of psychic force, under the very inappropriate name of magnetism (to which it has no affinity whatever), for they assert that the spirits of the dead can only do the acts attributed to them by using the magnetism (that is, the psychic force) of the mediums.”[332]