Hamilton alludes to a loadstone weighing 139 grains, with a lifting power of 23,760 grains! We have referred, amongst others, to the loadstone belonging to Sir Isaac Newton at A.D. 1675, and to the wonderful collection belonging to Mr. Butterfield at A.D. 1809. A loadstone weighing twelve ounces, capable of lifting sixty pounds of iron, is referred to in Terzagus, “Musæum Septalianum,” 1664, p. 42, while another weighing two and a half grains and lifting 783 grains is mentioned at p. 272, Vol. III. of the “Records of General Science”; and Salviatus (“Dialogues of Galileo,” Dial. III) alludes to one in the Academy of Florence which, unarmed, weighed six ounces and could lift but two ounces, but when armed had a lifting power of 160 ounces. At pp. 317–318, Part III of Nehemiah Grew’s “Musæum Regalis Societatis,” London, 1681--also 1686--allusion is made to a loadstone found in Devonshire, weighing about sixty pounds, which moved a needle nine feet distant. Grew then refers to Athan. Kircher and to Vincent Leotaud as having published what is said of the loadstone by Gilbert and others, and he likewise states: “Those that travail through the vast deserts of Arabia, have also a needle and a compass whereby they direct themselves in their way, as Mariners at sea [Majoli, ‘Colloquia’]; the power of the magnet dependeth not upon its bulk--the smaller being usually the stronger....” REFERENCES.--_Phil. Trans._ for, 1729–1730, No. 412, Vol. XXXVI. p. 245, and for July 1888, also Hutton’s abridgments, Vol. VII. p. 383; V. T. M. Van der Willigen, “Arch. du Musée Teyler,” 1878, Vol. IV; Jacobi Rohaulti, “Physica,” 1718, Part III. cap. 8, p. 403, or the English translation by Dr. Clarke, 1728, Vol. II. p. 181; P. W. Hacker, “Zur theorie des magnetismus,” Nürnberg, 1856; Ath. Kircher, “Magnes. ...” 1643, lib. i. part ii. p. 63; Daniel Bernoulli, “Acta Helvetica,” 1758, Vol. III. p. 223; Nic. Cabæus “Philosophia Magnetica,” 1629, lib. iv. cap. 42, p. 407; Kenelme Digby, “The Nature of Bodies,” 1645, Chap. XXII. p. 243; “Dict. of Nat. Biog.” Vol. XXIV. p. 185. =A.D. 1729–1730.=--Savery (Servington), English mechanician, succeeds in imparting magnetism to hard steel bars three-fourths of an inch square and sixteen inches long, by fitting one bar with an armature at each end and touching other bars with it whilst held in the magnetic meridian in the line of the inclined needle.