Plato; fourth, malicious,
revengeful devils, whose prince was Asmodeus; fifth, coseners, such as
belong to magicians and witches, their prince being Satan; sixth,
aerial spirits, that corrupted the air, and caused plagues, thunder,
fires, and other calamities; seventh, a destroyer, causing wars,
tumults, and combustions; eighth, an accusing or calumniating devil,
that drove people to despair; and the ninth, tempters in divers
shapes, having mammon for their prince. Burton goes further. He
asserts that "no place is void, but all full of spirits, devils, or
other inhabitants; not so much as a hairbreadth is empty in heaven,
earth, or waters above or under the earth. The earth is not so full of
flies in summer as it is at all times of invisible devils."

Psellus founded a system of demonology, which had for its basis the
natural history and habitation of demons. His first class consisted of
fiery devils, that wandered in the regions near the moon, but were
prevented from entering that luminary. They displayed their power in
blazing stars, in counterfeit suns, moons, and meteoric lights, and
prevented foul weather. These demons, we are informed, occasionally
resided in the furnaces of Hecla, Etna, or Vesuvius. His second class
was made up of aerial devils, that inhabited the atmosphere, caused
tempests, thunder, and lightning, rended asunder trees, burned down
steeples and houses, struck men and beasts, showered stones, wool, and
frogs from the skies; counterfeited in the clouds the battles of
armies, raised whirlwinds, fires, and corrupted the air so as to
spread disease. The third class was terrestrial devils, such as lares,
genii, fauns, satyrs, wood-nymphs, foliots, robin-goodfellows, or
trulli. The fourth class was aqueous devils, as the various
descriptions of water nymphs. The fifth class consisted of
subterranean devils, known by the name of Getuli or Cobals. They
preserved treasure in the earth, and prevented it being suddenly
revealed; they were also the cause of horrible earthquakes. Psellus's
sixth class of devils was named lucifugi. They delighted in darkness,
entered into the bowels of men, and tormented those whom they
possessed with frenzy and the falling sickness. An opinion prevailed
that devils possessed corporeal frames, capable of sensation; that
they could feel and be felt; that they could injure and be hurt; that
they were nourished with peculiar food; that they did not hurt cattle
from malevolence,