Henry Cornelius Agrippa's Fourth Book Of Occult... ●

The authenticity of the Fourth Book is the subject of long-standing debate.

A system of divination using earth markings, often attributed to Agrippa himself.

Uniquely, it includes a chapter on raising the spirits of the dead, further distinguishing its "darker" practical tone from the more intellectual Three Books . 4. Legacy and Influence

An introductory discourse on the nature of sublunary spirits by Georg Pictorius. 3. Practical Magical Techniques