I.
We have fully commented on how the belief in Spirits was introduced among men, and how these Spirits were but phantoms which existed in their imagination. The ancient Philosophers were not sufficiently clear to explain to the people what these phantoms were, and did not allow themselves to say that they could raise them. Some seeing that these phantoms dissolved and had no consistency, called them immaterial, incorporeal, forms without matter, or colors and figures, without being, nevertheless, bodies either colored or defined, adding that they could cover themselves with air like a mantle when they wished to render themselves visible to the eyes of men. Others said that they were animated bodies, but were composed of air, or some other more subtile matter which condensed at their will when they wished to appear.