420 



INDEX. 



Races, dependence of, 315. 

 Repulsion of heat, 108. 

 Respiration of animals, 310. 



plants, 312. 



Rest, absolute and relative, 15. 

 Respiration a cause of heat, 105. 

 Retina, the, 149. 

 Revelations of nature, 401. 

 Revolution of magnetic poles, 246. 

 Robinson on decomposition by heat 



98. 



Rock formations, 335. 

 Rocks, conducting power of, 224. 

 Rosse's, Lord, telescopes, 25. 

 Rumford, Count, experiments on heat, 



18. 



on chemical properties of light, 

 99. 



Rings, Newton's, 137. 



Safety lamp of Davy, 309. 

 Salt rock, transparency to heat, 65. 

 Saturn's ring explained, 34. 

 Savart on vibrating plates, 257. 

 Seasons, influence of heat on the, 70. 

 Sea, phosphorescence of, 158. 

 Schonbein on ozone, 299. 

 Schwabe on solar spots, 243. 

 Seebeckouthermo-electricity,211,248. 

 Selenite and alabaster, 60. 

 Senarmont on conducting power of 



crystals for heat, 257- 

 Shooting stars, 21. 

 Silicon, allotropic state of, 43. 

 Silica, substitution of, 345. 

 Simple bodies, chemical, 329. 

 Sky of tropical climes, 319. 

 Slow combustion in animals, 397. 

 Smee on electricity and vitality, 219. 

 Solar system, motion of, 11. 



disc, light from, 185. 



influence on magnetism, 263. 



Solidification of gases by Faraday. 

 112. 



Solstices, summer and winter, 77- 



Solar spots connected with magne- 

 tism, 243. 



Solar phosphori, 161. 



Somerville, Mrs., magnetises needles 

 by light, 263. 



Sound and light, analogy of, 151. 



Spectra produced by polarization of 

 light, 144. 



Spectrum, dark lines of, 125. 



Spheroidal condition of fluids, 107. 



Spontaneous ignition, 307. 



Stahl on phlogiston, 305. 



Stars, shooting, theories of, 21. 



Steel ornaments incandescent, 137. 



Stereoscope, the, 151. 



Stokes, Prof., on fluorescence, 130. 



Stratified formations, 334. 



Substitution, chemical, 279. 



, law of, 288. 



Substances, all, electric, 197. 



Subterranean temperature, 91. 



Sulphuric acid, permeability to heat, 

 65. 



Surfaces, action of, 282. 



Strength of animals, 400. 



Structure, influence of, on magnetism, 

 256. 



, relation of, to physical pheno- 

 mena, 257. 



Struve on motion of solar system, 12. 



Sulzar on galvanism, 201. 



Sulphuretted hydrogen, solid, 111. 



Sun, the central, 28. 



, the source of light, 121. 



, physical state of the, 123. 



, a magnetic centre, 265. 



TADPOLE, metamorphosis of, 389. 

 Talbot's sensitive photographic process, 



178. 



Telegraph, electric, 231. 

 Temperature of incandescence, 68. 

 Temperature, subterranean, 91. 

 Terrestrial currents of electricity, 224. 

 magnetism, 255. 

 Thales of Miletus discovers electricity, 



193. 



Theories of light, 86, 118. 

 Thermography, 188. 

 Thermometric examination of the 



temperature of flowers, 76. 



