Abano, Pietro di (Apponensis or Apianus), 2. Abbas, Hali ('Alí ibn Al 'Abb[=a]s, _Al Majúsi_, 2, 6. Abohalis, 47. _See also_ Avicenna. _aciarium_ or _acies_, also _aciare_, 18, 23, 33, 36. Acosta, Josephus, 5. adamant, 11. æquator, the magnetick, 13, 79. Aetius Amidenus, 2. Affaytatus, Fortunius, 6. agate, non electrick, 51, 53. Agricola, Georgius, 2, 3, 10, 19, 26, 111, 112. Agrippa, H. Cornelius, 3. _aimant_, 11. Albategnius (Muhammad ibn J[=a]bir, _Al-Batt[=a]ni_, 237. Albertus Magnus, 2, 7, 18, 111. Alexander Aphrodiseus, 3, 48, 92. Alexandria, Hero of, 58. Alfonso, Diego, 178. Alfonsus the Wise (Alphonsus X.), 237. Amalfians said to have first constructed the compass, 4. Amatus Lusitanus, 2. amber, 47, 49-60, 85, 112, 116. amethyst, electrical properties of, 48. amianth, 11. Amidenus, Aetius, 2. amphitane, 111. Anatolismus, or Northeasting, 167. Anaxagoras, 61, 208. Andrea Doria (Admiral), 4. Antonius de Fantis, 107. Antonius Musa Brasavolus, 2. Antony, the denarius of, 110. Apianus. _See_ Abano. Apponensis. _See_ Abano. Aquinas, Thomas, 3, 64. Aractensis, Mahometes, 234, 237. Archelaus, 208. Ardoynis, Santes de, 2. Arias Montanus, 4. Aristarchus, 214, 237. Aristotle: _De Anima_, 1, 11, 61, 210. _De Coelo_, 226, 232. _De Mirabilibus Auscultationibus_, 22. _Meteorologica_, 35, 39. on material of the metals, 19, 20. on the element of earth, 43. on motions, 45, 219, 225. on primary form, 65. on the _Primum Mobile_, 220. on animate nature of planets, 208. armature, 87. armed loadstones, 86, 87, 88, 89. Arnaldus de Villa nova, 2, 7. Arsinoe, Temple of, 2. Attraction, 46, 60, 64, 68, 90, 98, 109. Avicenna (Abu 'Ali Husain ibn 'Abd Allah, _Ibn Síná_; also called Abohalis): writes on the magnet, 2. on falling masses of iron, 26. alleges loadstone an antidote to iron poison, 35. on the property of attraction, 49. Augsburgers (Augustani), the, prescribe loadstone in plaster, 33. axis, the magnetick, 13, 81, 212. Azores, variation of compass at the, 4, 154, 156, 167.