Book III
- Chapter 1
- Chapter 2: The Directive or Versorial Virtue (which we call
- Chapter 3: How Iron acquires Verticity through
- Chapter 4: Why Iron touched by a Loadstone acquires an opposite
- Chapter 5: On the Touching of pieces of Iron
- Chapter 6: What seems an Opposing Motion in Magneticks
- Chapter 7: A determined Verticity and a disponent Faculty are what
- Chapter 8: Of Discords between pieces of Iron upon the same pole
- Chapter 9: Figures illustrating direction and showing varieties
- Chapter 10: On Mutation of Verticity and of Magnetick
- Chapter 11: On the Rubbing of a piece of Iron on a Loadstone
- Chapter 12: In what way Verticity exists in any Iron that has
- Chapter 13: Why no other Body, excepting a magnetick, is imbued
- Chapter 14: The Placing of a Loadstone above or below a magnetick
- Chapter 15: The Poles, Æquator, Centre in an entire Loadstone
- Chapter 16: If the Southern Portion of a Stone be lessened,
- Chapter 17: On the Use and Excellence of Versoria: and how iron