INDEX. 



509 



cold , and of the poles of rotation , 297- 

 On the parallelism of the isothermal 

 and geothermal lines, ib. His ob- 

 servations on phosphor esceace, 325. 



Brinkley, Bishop, his value of the mass 

 of the moon, 64. 



Brorsen, M., comets discovered by, 

 398, 399. 



Brown, Mr., his botany of Australia, 

 304. 



Buchan, Dr., his account of a mirage, 

 176. 



Burnes, Mr., his account of a volcanic 

 elevation, 284. 



C. 



Caesar, Julius, his Calendar, 96. 

 Cagniard de la Tour, M., his invention 



of the Syren, 160. 



Calcott, Mrs., her account of the earth- 

 quake at Valparaiso, 284. 

 Caloric the cause of heat, 238. 



, the radiation of, 240, 254. 



Calorific rays of the solar spectrum, 238. 



independent of light, 238 et seq. 



, transmission of the, 240 et seq. 



, reflection and absorption of the, 



246, 254. 



, refraction of, 246. 



, polarization of, 248. 

 Calotype, 225. 

 Capillary attraction, 127. 



of tubes. ]27. Notes 168, -169, 170. 



of plates, 130 et seq. Notes 171, 



172. 



Catalogue of fixed stars, uses of, 413. 

 Centre of gravity, 5. Note 10. 

 of the solar system, its motion, 9, 



27. Note 82. ' 



of the universe, 28. 



Centrifugal force, 6, 11 1. Notes 18, 157. 

 Chaldeans.theirobservations of eclipses, 



41, 44. 

 Chemical rays of the solar spectrum, 



239. 



, transmission of, 253. 



Chemical affinity, 122. 



Chinese science, 99, 101. 



Chaldni, his experiments on vibrating 



plates, 162. Note 179. 



Christian era, 96. 



Chromatype, 227. 



Clairaut, his computation of the dis- 

 turbances of Halley's comet, 390. 



Cleavage, 126. 



Climate, 290. 



, stability of, 299. 



of the planets, 273. 



Climates, excessive, 298. 



Clusters of stars, 433, 343 et seq. 



Coal measures, their early formation, 

 84. 



"Coal sacks," dark vacuities in the 

 heavens so called by ancient navi- 

 gators, 415. 



Cobalt, a metal, its polarity, 348. 



Cohesion, 114 et seq. 



Cohesive force, the intensity of, 122. 



Cold at Melville Island, 276. 



Colladon, M., his experiments on sound 

 under water, 150. 



Collision of a comet, 87, 396. 



Coloured media, their action on light, 

 179, 196. 



fringes, 188, 194 et seq. 



Colours, prismatic, 178 et seq. 



, accidental, 184. 



, complementary, 185. 



of the stars, 421. 



Columbus, his account of the Gulf- 

 weed, 305 ; discovers the variation of 

 the compass, 347. 



Coma Berenices, the constellation, 

 nebulae in it, 441. 



Comet, Halley's, 390. 



, Lexel's, 388. 



, Encke's, 393. 



, acceleration of a, 394. 



, Biela or Gambart's, 395, 396. 



divided into two distinct bodies, 



398. 



, shock of a, 396. 



of the year 1680, 397. 



of 1264, 399. 



Comets, 385. 



, orbits of, 387, 399. 



, velocity of, 399. 



, fall of, to the sun, 400. 



, masses of, 403. 



, tails of, 405. 



, nebulosity of, 402, 408. 



, light of, 409. 



