On the magnet, magnetick bodies also, and on the great magnet the earth / a new physiology, demonstrated by many arguments & experiments

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[Chap. 29]. On Variety of Strength due to Quantity or Mass.

[Chap. 30]. The Shape and Mass of the Iron are of most importance in cases of coition.

[Chap. 31]. On long and round stones.

[Chap. 32]. Certain Problems and Magnetick Experiments about the Coition, and Separation, and regular Motion of Bodies magnetical.

[Chap. 33]. On the Varying Ratio of Strength, and of the Motion of coition, within the orbe of virtue.

[Chap. 34]. Why a Loadstone should be stronger in its poles in a different ratio; as well in the Northern regions as in the Southern.

[Chap. 35]. On a Perpetual Motion Machine, mentioned by authors, by means of the attraction of a loadstone.

[Chap. 36]. How a more robust Loadstone may be recognized.

[Chap. 37]. Use of a Loadstone as it affects iron.

[Chap. 38]. On Cases of Attraction in other Bodies.