3. In an etherealized state the cosmic fluid is not uniform. Without ceasing to be ethereal, it is submitted to modifications as varied in their kind and more numerous than in a state of tangible matter. These modifications constitute distinct fluids, which, although proceeding from the same principle, are endowed with special properties, and give rise to particular phenomena of the invisible world.
All being relative, these fluids have for the spirits, who are themselves fluidic, an appearance as material as that of the objects for the incarnates, and are for them that which the substances of the terrestrial world are for us. They elaborate and combine them, in order to produce determined effects, as men do with their materials, yet by different processes.
But there, as here, it is only given to the most enlightened spirits to comprehend the role of the constitutive elements of their world. The ignorant people of the invisible world are as incapable of explaining the phenomena of which they are witnesses, and in which they cooperate often mechanically, as the ignorant of Earth are of explaining the effects of light or of electricity, or of explaining the process of seeing and hearing.