Chap. 4. Which pole of the stone is the Boreal: and how it is distinguished from the austral. Chap. 5. Loadstone seems to attract loadstone when in natural position: but repels it when in a contrary one, and brings it back to order. Chap. 6. Loadstone attracts the ore of iron, as well as iron proper, smelted & wrought. Chap. 7. What iron is, and of what substance, and its uses. Chap. 8. In what countries and districts iron originates. Chap. 9. Iron ore attracts iron ore. Chap. 10. Iron ore has poles, and acquires them, and settles itself toward the poles of the universe. Chap. 11. Wrought iron, not excited by a loadstone, draws iron. Chap. 12. A long piece of Iron (even though not excited by a loadstone) settles itself toward North & South. Chap. 13. Wrought iron has in itself certain parts Boreal & Austral: a magnetick vigour, verticity, and determinate vertices or poles. Chap. 14. Concerning other powers of loadstone, & its medicinal properties. Chap. 15. The medicinal virtue of iron. Chap. 16. That loadstone & iron ore are the same, but iron an extract from both, as other metals are from their own ores; & that all magnetick virtues, though weaker, exist in the ore itself & in smelted iron. Chap. 17. That the globe of the earth is magnetick, & a magnet; & how in our hands the magnet stone has all the primary forces of the earth, while the earth by the same powers remains constant in a fixed direction in the universe. _Book 2._ Chap. 1. On Magnetick Motions. Chap. 2. On the Magnetick Coition, and first on the attraction of Amber, or more truly, on the attaching of bodies to Amber. Chap. 3. Opinions of others on Magnetick Coition, which they call Attraction. Chap. 4. On Magnetick Force & Form, what it is; and on the cause of the Coition. Chap. 5. How the Power dwells in the Loadstone. Chap. 6. How magnetick pieces of Iron and smaller loadstones conform themselves to a terrella & to the earth itself, and by them are disposed. Chap. 7. On the Potency of the Magnetick Virtue, and on its nature capable of spreading out into an orbe. Chap. 8. On the geography of the Earth, and of the Terrella. Chap. 9. On the Æquinoctial Circle of the Earth and of a Terrella. Chap. 10. Magnetick Meridians of the Earth. Chap. 11. Parallels. {vij} Chap. 12. The Magnetick Horizon. Chap. 13. On the Axis and Magnetick Poles. Chap. 14. Why at the Pole itself the Coition is stronger than in the other parts intermediate between the æquator and the pole; and on the proportion of forces of the coition in various parts of the earth and of the terrella. Chap. 15. The Magnetick Virtue which is conceived in Iron is more apparent in an iron rod than in a piece of Iron that is round, square, or of other figure. Chap. 16. Showing that Movements take place by the Magnetical Vigour though solid bodies lie between; and on the interposition of iron plates.