Note 13 — Introductory material
Reading edition
In his “De Mineralibus” (Lyons ed. 1651, Treat. III. lib. ii. cap. 6, p. 243), Albertus says: “One angle ... is to the zohron (north) ... but another angle of the magnet opposite to it attracts to the aphron (south).” Cardan (“De Subtilitate,” Lugduni, 1663); Salmanazar (Book II. “of the Egyptian Hermitus, 19 stars, and 15 stones, and 15 herbs, and 15 figures”: “on one side the magnet attracts iron, on the other side repels it); Pietro d’ Abano (“Conciliator Differentiarum,” Mantuæ, 1472, Diff. 51, p. 104, or the 1520 Venice edition, p. 73: “know that a magnet is discovered which attracts iron on one side and repels it on the other”).