[Chap. 19]. Union with an armed Loadstone is stronger; hence greater weights are raised; but the coition is not stronger, but generally weaker.
[Chap. 20]. An armed Loadstone raises an armed Loadstone, which also attracts a third; which likewise happens, though the virtue in the first be somewhat small.
[Chap. 21]. If Paper or any other Medium be interposed, an armed loadstone raises no more than an unarmed one.
[Chap. 22]. That an armed Loadstone draws Iron no more than an unarmed one: and that an armed one is more strongly united to iron is shown by means of an armed loadstone and a polished Cylinder of iron.
[Chap. 23]. The Magnetick Force causes motion toward unity, and binds firmly together bodies which are united.
[Chap. 24]. A piece of Iron placed within the Orbe of a Loadstone hangs suspended in the air, if on account of some impediment it cannot approach it.
[Chap. 25]. Exaltation of the power of the magnet.
[Chap. 26]. Why there should appear to be a greater love between iron & loadstone, than between loadstone & loadstone, or between iron & iron, when close to the loadstone, within its orbe of virtue.
[Chap. 27]. The Centre of the Magnetick Virtues in the earth is the centre of the earth; and in a terrella is the centre of the stone.
[Chap. 28]. A Loadstone attracts magneticks not only to a fixed point or pole, but to every part of a terrella save the æquinoctial zone.