"The third class of elementals proper never evolve into human beings, but occupy, as it were, a specific step of the ladder of being, and, by comparison with the others, may properly be called nature-spirits, or cosmic agents of nature, each being confined to its own element, and never transgressing the bounds of others. These are what Tertullian called 'the princes of the powers of the air.' "This class is believed to possess but one of the three attributes of man. They have neither immortal souls nor tangible bodies; only astral forms, which partake, in a distinguishing degree, of the element to which they belong, and also of the ether. They are a combination of sublimated matter and a rudimental mind. Some are changeless, but still have no separate individuality, acting collectively so to say. Others, of certain elements and species, change form under a fixed law which Kabalists explain. The most solid of their bodies is ordinarily just immaterial enough to escape perception by our physical eyesight, but not so unsubstantial but that they can be perfectly recognized by the inner or clairvoyant vision. They not only exist, and can all live in ether, but can handle and direct it for the production of physical effects, as readily as we can compress air or water for the same purpose by pneumatic or hydraulic apparatus; in which occupation they are readily helped by the 'human elementary.' More than this; they can so condense it as to make to themselves tangible bodies, which by their protean powers they can cause to assume such likenesses as they choose, by taking as their models the portraits they find stamped in the memory of the persons present. It is not necessary that the sitter should be thinking at the moment of the one represented. His image may have faded away years before. The mind receives indelible impression even from chance acquaintance, or persons encountered but once." (Pp. 310, 311, vol. I.) "If spiritualists are anxious to keep strictly dogmatic in their notions of the spirit-world, they must not set _scientists_ to investigate their phenomena in the true experimental spirit. The attempt would most surely result in a partial re-discovery of the magic of old--that of Moses and Paracelsus. Under the deceptive beauty of some of their apparitions, they might find some day the sylphs and fair undines of the Rosicrucians playing in the currents of _psychic_ and _odic_ force. "Already Mr. Crookes, who fully credits the _being_, feels that under the fair skin of Katie, covering a simulacrum of heart borrowed partially from the medium and the circle, there is no soul! And the learned authors of the _Unseen Universe_, abandoning their "electro-biological" theory, begin to perceive in the universal ether the _possibility_ that it is a photographic album of _En-Soph_ the Boundless.--(P. 67, vol. I.)