Bacon, Roger, 5. Bambola, or Bilbilis, 23. Baptista Montanus, 2. Baptista Porta. _See_ Porta. Barbarus, Hermolaus, 3. Barlowe, William (Rev. Archdeacon), his book, _The Navigators Supply_, 8. basil leaves alleged not to be attracted, 48. belemnites are electrical, 48. Bencora (Th[=a]bit ibn Kurrah, _Al Harrani_; also called Thebitius), 117, 236. Benedictus, Joannes Baptista (Giambattista Benedetti), 167. beryl, electrick properties of, 48. Bessardus (Toussaincte de Bessard), 5, 116, 153. Blondus, Flavius, the historian, 4. Borough, William, his book on the _Variation of the Compass_, 8. Borrholybicum (North-north-west), 160. Brahe, Tycho, 174, 229. Brandoe, the island of, 181. Brasavolus, Antonius Musa, 2. Bristolla, or Bristol gem, 48. burnt clay, magnetick properties of, 26, 43. {242} Cabot, Sebastian, 4. Cælius Calcagninus, 7. Cæsare, or Cesare, Giulio, 141. Calaber, Hannibal Rosetius, 3, _calamita_ or _kalamita_, 11. Calcagninus, Cælius, 7. Camillus Leonhardus, 3. Candish, or Cavendish, Thomas, *iij, 117. cap of iron for a loadstone, 86, 89, 90, 95. _carabe_, or _karabe_, 47. carbuncle, electrick properties of, 48, 111. Cardan, Hieronymo, 2. _De Proportionibus_: on iron and earth, 43, 62, 67. on distance of centre of cosmos, 169. _De Rerum Varietate_: on fall of meteorick iron, 26. on attraction of amber, 49. on a perpetual motion engine, 107. _De Subtilitate_: alleges magnet to feed on iron, 37, 63, 92. on magnet that draws silver, 110. on magnetick influence of star in tail of _Ursa Minor_, 5, 116, 153. carnelian, the, 51, 55. _catoblepas_, the antelope called, 63. Cesare, Giulio, 141. _chalybs_, 18, 25, 33. chatochitis, 111. chemists, the, 19, 20, 21, 24, 37, 66. China, 4, 8, 9, 11, 17, 32, 119. Chinocrates, 2. circumpulsion, doctrine of, 3, 61. clamps (open kilns), 26. clay when burnt is magnetick, 26, 43, 97. clepsydra, 231. Coimbra, College of, 5. coition (mutual attraction), 45, 46, 60, 65, 67, 68, 81, 98, 99, 103, 109, 131. definition of, *vj, 68. orbe of, *vj. colours of loadstones, 9, 10, 27. Como, 23. compass, alleged invention of, by Amalfians, 4. origin of the compass-card, 4, 165. the mariners' (_pyxis_), 3, 115, 147, 165, 172. the little (_pyxidula_), 181, 202. different forms of, Italian, Baltic, Portuguese, English, 165, 166, 177, 181. conduction, magnetick, 85, 104, 125. consequent poles, 129, 142. Copernican system, 231. Copernicus, Nicolas, 212, 214, 216, 231, 237, 238, 240. Cordus, Valerius, 10. Cornelius Agrippa, 3. Cornelius Gemma, 63. Cornelius Tacitus, 25. _corolla insorta_, or contorted circlet, 238, 240. Cortes, Martin, 5, 116, 152. Corvo, Island of, 167. Costa, Filippo (of Mantua), 141. Costæus, Joannes, 3, 62, 227, 228. _creagus_, the, or flesh-magnet, 110.