[Chap. 39]. On Bodies which mutually repel one another.
Book 3.
[Chap. 1]. On Direction.
[Chap. 2]. The Directive or Versorial Virtue (which we call verticity): what it is, how it exists in the loadstone; and in what way it is acquired when innate.
[Chap. 3]. How Iron acquires Verticity through a loadstone, and how that verticity is lost and changed.
[Chap. 4]. Why Iron touched by a Loadstone acquires an opposite verticity, and why iron touched by the true Northern side of a stone turns to the North of the earth, by the true Southern side to the South; and does not turn to the South when rubbed by the Northern point of the stone, and when by the Southern to the North, as all who have written on the Loadstone have falsely supposed.
[Chap. 5]. On the Touching of pieces of Iron of divers shapes.
[Chap. 6]. What seems an Opposing Motion in Magneticks is a proper motion toward unity.
[Chap. 7]. A determined Verticity and a disponent Faculty are what arrange magneticks, not a force, attracting them or pulling them together, nor merely a strongish coition or unition.
[Chap. 8]. Of Discords between pieces of Iron upon the same pole of a Loadstone, and how they can agree and stand joined together.