 Beyond these deceits, that are believed to be genuine solely by the masses and that turn out to be “useless fictions”, the nucleus of the book is natural magic. On the one hand, it is connected to the arts and sciences: all wondrous inventions appear at first to be the result of magical operations, until their true causes are discovered. On the other hand, its particular sphere is the knowledge of unusual and arcane events. Natural magic, by means of its body of knowledge, is able to produce specific alterations in the mobile and tenuous spiritus, which is capable of submitting to and receiving any impression. The basic passions are pain and joy, love and hate, hope and fear. The magician is someone who has the ability to act on these passions by employing herbs, phrases, actions and anything else that might be suitable. This person will know how to increase bodily powers, suggesting foods, drinks, climates, sounds, herbal and animal remedies that aid and strengthen vital energies and counseling against anything that has to do with putrefaction and death.