The Heptameron is also called Magical Elements, this book is attributed to Peter of Abano, an Italian physician who died in 1316 after being condemned to death by the Inquisition. Abano is not believed to be the author. The Heptameron probably was written in the 16th century and may have been intended as a supplement to the Fourth Book.
The grimoire is a composite work of white and black magic that deals with finding treasure, procuring love, detecting secrets, opening locks, fomenting hatred and evil thoughts, and so on. It is divided into two parts: the evocation of the Spirits of the Air, who are Demons, and a set of angelic evocations for each day of the week.