Chap. IX, why the northern part attracts the southern part, and the converse;
Chap. X, of the inquiry whence the magnet derives the natural power it possesses.
Petrus Peregrinus. “Epistola ... de Magnete.”
The earliest known treatise of experimental science, now in the Bibliothèque Nationale, Paris.
Of Part II: Chap. I, on the construction of an instrument (floating compass) by which the azimuth of the sun and moon, and of any star above the horizon, can be ascertained;
Chap. II, on the construction of a better instrument (pivoted compass) for like purpose;
Chap. III, on the construction of a wheel for perpetual motion.
An analyzation of each chapter in turn will show how satisfactorily Peregrinus has developed, in connected series, all of the early experiments upon which are based his theories of the loadstone.