PART I.

Chap. I. Purpose of this work. II. Qualifications of the experimenter. III. Characteristics of a good lodestone. IV. How to distinguish the poles of a lodestone. V. How to tell which pole is north and which south. VI. How one lodestone attracts another. VII. How iron touched by a lodestone turns towards the poles of the world. VIII. How a lodestone attracts iron. IX. Why the north pole of one lodestone attracts the south pole of another, and _vice versa_. X. An inquiry into the natural virtue of the lodestone.