"The rapport with this realm of beings is generally due to certain proclivities in the individual; or, when whole communities are affected, the cause proceeds from revolutionary movements in the realms of astral fluid; these continually affect the elementals, who, in combination with low undeveloped spirits of humanity (elementaries), avail themselves of magnetic epidemics to obsess susceptible individuals, and sympathetically affect communities." In the introduction to _Isis Unveiled_, we find the following definition of elementary spirits: "Properly, the disembodied _souls_ of the depraved; these souls, having at some time prior to death, separated from themselves their divine spirits, and so lost their chance of immortality. Eliphas Levi and some other Kabalists make little distinction between elementary spirits, who have been men, and those beings which people the elements and are the blind forces of nature. Once divorced from their bodies, these souls (also called astral bodies) of purely materialistic persons, are irresistibly attracted to the earth, where they live a temporary and finite life amid elements congenial to their gross natures. From having never, during their natural lives, cultivated this spirituality, but subordinated it to the material and gross, they are now unfitted for the lofty career of the pure, disembodied being, for whom the atmosphere of earth is stifling and mephitic, and whose attractions are all away from it. After a more or less prolonged period of time these material souls will begin to disintegrate, and finally, like a column of mist, be dissolved, atom by atom, in the surrounding elements.--(Preface xxx., vol. I.) "After the death of the depraved and the wicked, arrives the critical moment. If during life the ultimate and desperate effort of the inner-self to reunite itself with the faintly-glimmering ray of its divine parent is neglected; if this ray is allowed to be more and more shut out by the thickening crust of matter, the soul, once freed from the body, follows its earthly attractions, and is magnetically drawn into and held within the dense fogs of the material atmosphere. Then it begins to sink lower and lower, until it finds itself, when returned to consciousness, in what the ancients termed Hades. The annihilation of such a soul is never instantaneous; it may last centuries perhaps; for nature never proceeds by jumps and starts, and the astral soul, being formed of elements, the law of evolution must bide its time. Then begins the fearful law of compensation, the _Yin-Youan_ of the Buddhists. This class of spirits is called the terrestrial, or _earthly_ elementary, in contradistinction to the other classes." (They frequent seance rooms, &c.)--(P. 319, vol. I.) Of the danger of meddling in occult matters before understanding the elementals and elementaries, _Isis_ says, in the case of a rash intruder: