"Preterea id manifestissimum est; quoniam Arimini, in templo Sancti Ioannis, fuit Crux ferrea, quæ tractu temporis in magnetem conuersa est, & ab vno latere ferrum trahebat, & ab altero respuebat." See also Sir T. Browne's _Pseudodoxia Epidemica_ (edition of 1650, p. 48), and Boyle's tract, _Experiments and Notes about the Mechanical Production of Magnetism_ (London, 1676, p. 12). {54} Another case is mentioned in Dr. Martin Lister's _A Journey to Paris_ (Lond., 1699, p. 83). "He [Mr. Butterfield] shewed us a Loadstone sawed off that piece of the Iron Bar which held the Stones together at the very top of the Steeple of _Chartres_. This was a thick Crust of Rust, part of which was turned into a strong Loadstone, and had all the properties of a Stone dug out of the Mine. _Mons. de la Hire_ has Printed a Memoir of it; also Mons. _de Vallemont_ a Treatise. The very outward Rust had no Magnetic Virtue, but the inward had a strong one, as to take up a third part more than its weight unshod." Gassendi and Grimaldi have given other cases. Other examples of iron acquiring strong permanent magnetism from the earth are not wanting. The following is from Sir W. Snow Harris's _Rudimentary Magnetism_ (London, 1872, p. 10). "In the _Memoirs of the Academy of Sciences_ for 1731, we find an account of a large bell at Marseilles having an axis of iron: this axis rested on stone blocks, and threw off from time to time great quantities of rust, which, mixing with the particles of stone and the oil used to facilitate the motion, became conglomerated into a hardened mass: this mass had all the properties of the native magnet. The bell is supposed to have been in the same position for 400 years." [214] PAGE 142, LINE 13. Page 142, line 15. _tunc planetæ & corpora coelestia._--Gilbert's extraordinary detachment from all metaphysical and ultra-physical explanations of physical facts, and his continual appeal to the test of experimental evidence, enabled him to lift the science of the magnet out of the slough of the dark ages. This passage, however, reveals that he still gave credence to the _nativities_ of judicial Astrology, and to the supposed influence of the planets on human destiny. [215] PAGE 144, LINE 14. Page 144, line 14. _ijdem._--The editions of 1628 and 1633 erroneously read _iisdem_.