In the former book, which is the fourth book of Agrippa, it is sufficiently spoken concerning Magical Ceremonies, and Initiations. But because he seemeth to have written to the learned, and well experienced in this art; because he doth not specially treat of the Ceremonies, but rather speaketh of them in general, it was therefore thought good to adde hereunto the Magical Elements of Peter de Abano: that those who are hitherto ignorant, and have not tasted of Magical Superstitions, may have them in readiness, how they may exercise themselves therein. For we see in this book, as it were a certain introduction of Magical vanity; and, as if they were in present exercise, they may behold the distinct functions of spirits, how they may be drawn to discourse and communication; what is to be done every day, and every hour; and how they shall be read, as if they were described sillable by sillable. In brief, in this book are kept the principles of Magical conveyances. But because the greatest power is attributed to the Circles; (For they are certain fortresses to defend the operators safe from the evil Spirits;) In the first place we will treat concerning the composition of a Circle.