Speaking of Pythagoras, Iamblichus, and other Greek philosophers, _Isis_ says:
"The universal ether was not, in their eyes, simply a something stretching, tenantless, throughout the expanse of heaven; it was a boundless ocean peopled, like our familiar seas, with monstrous and minor creatures, and having in its every molecule the germs of life. Like the finny tribes which swarm in our oceans and smaller bodies of water, each kind having its 'habitat' in some spot to which it is curiously adapted; some friendly and some inimical to man; some pleasant and some frightful to behold; some seeking the refuge of quiet nooks and land-locked harbors, and some traversing great areas of water, the various races of the elemental spirits were believed by them to inhabit the different portions of the great ethereal ocean, and to be exactly adapted to their respective conditions." (P. 284, vol. I.)
"Lowest in the scale of being are those invisible creatures called by the Kabalists the _elementary_. There are three distinct classes of these. The highest, in intelligence and cunning, are the so-called terrestrial spirits, the _larvæ_, or shadows of those who have lived on earth, have refused all spiritual light, remained and died deeply immersed in the mire of matter, and from whose sinful souls the immortal spirit has gradually separated. The second class is composed of invisible antitypes of men _to be_ born. No form can come into objective existence, from the highest to the lowest, before the abstract idea of this form, or as Aristotle would call it, the privation of this form is called forth.... These models, as yet devoid of immortal spirits, are elementals properly speaking, _psychic embryos_--which when their time arrives, die out of the invisible world, and are borne into this visible one as human infants, receiving _in transitu_ that divine breath called spirit which completes the perfect man. This class cannot communicate objectively with man.
"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.'