INDEX. 



521 



u. 



Radial force, 9. 



Radiation, 254 et seq. 



of the earth, 287- 



of the sea, 203. 



, solar, 78. Note 140. 



Radii vectores, 10. Note 40. 



Radius, 6. Note 15. 



, terrestrial, polar, and equatorial, 



55. 



, solar, 64. 



, vector, 17. 



Raffles, Sir Stamford, his account of the 

 volcanic irruption at Sambawa, 283. 



Rain, 255. 



Ratio, 6. Note 16. 



Rays of light, 172. 



of heat, 240. 



, chemical, 224 et seq. 



, extraordinary and ordinary, 203. 



Reflection of light, 175. Notes 184, 1 98. 



, extraordinary and total, 175. Note 



184. 



of sound, 146. Notes 174, 175. 



Refraction of light, 171, 172, 198. Notes 

 184, 198. 



, atmospheric, 172. Note 185. 



in eclipses, 46. 



, terrestrial, 173. Note 187. 



.extraordinary, 174. Notes 188, 



189. 



Repulsive force, 114 



Resisting medium, and its effects, 25, 

 189,394. Note 78. 



Resonance, 167- 



Retrograde motion, 16. Note 61. 



Revolution, sidereal, of planets, 19. 

 Note 68. 



, tropical, 19. Note 69. 



, synodic, 46. Note 112. 



and rotation of the celestial bodies 



in the same direction, 69. 



Rhombohedron, 202. Note 200. 



Richman, Professor, killed by light- 

 ning, 322. 



Richter, his observations on the pendu- 

 lum at Cayenne, 58. 



Rings, Saturn's, 75. 



, coloured, round small apertures, 



194. 



, Newton's, 193. Note 194. 



Ritchie, Professor, causes water to ro- 

 tate, 357. Effects the composition of 

 water by magnetic action, 383. 



Ross, Capt., his determination of the 

 north magnetic pole, 342. 



, Sir James, his determination of the 



south magnetic pole, 342. 



Rotation of the sun and planets, 8, 74. 



of a fluid mass, 7, 50. 



of the earth, 66, 80. 



, invariability of the earth's, 88. 



of the moon, 77- 



of Jupiter's satellites, 79. 



of Saturn's rings, 76. 



of winds, 136 et seq. 



of water by electricity, 357- 



of magnets, 356. 



S. 



Sabine, Colonel, on the magnetic equa- 

 tor, 342, 346. 



Salt and sugar, their capillary attrac- 

 tion, 129. 



, rock, highly permeable to heat, 



241, 244. 



Satellite shooting stars, 450. 



Satellites, 8. Note 32. 



of Jupiter, their theory, 31. 



of Saturn and Uranus, 37- 



Saturn and his rings, 75. 



Saussure, M., on the temperature of 

 mines, 277, 279. 



Savart, M., his experiments on the sense 

 of hearing, 147. On the vibration of 

 elastic bodies, 164 et seq. 



Savary, M., the first who determined 

 the orbit of a binary star, 417. 



Schrdeter, M., on the atmosphere of 

 Ceres, 273. 



Scoresby, Capt., on extraordinary re- 

 fraction, 174. On the temperature of 

 the Arctic regions, 297. 



Seasons, variation of, 98. 



Secular variations, 15. 



of apsides, 18. Notes 66, 67. 



of excentricity, 22. Note 70. 



of the excentricity of the terrestrial 



orbit, 20. 



of nodes, 21 et seq. Note 73. 



MM 



