INDEX. 



417 





Hobbes on the properties of matter, 8. 

 Hopkins on the temperature of fu- 

 sion, 107. 



Huyghens on double refraction, 140. 

 Hydra, the, 387. 

 Hydrogen, peroxide of, 298. 



and oxygen, 289, 297- 

 Hydro-carbons, 297. 

 Hydro-carbon compounds, 308. 

 Hypnotism, Mr. Braid on, 269. 



ICE, 301. 



Ichthyosaurus, the, 341. 



Igneous rocks, 335. 



Ignition by chemical action, 102. 



Iguanodon, the, 343. 



Incandescence, temperature of, 69-100. 



Influences of matter on heat, 79. 



Infusoria and animalculse, 387- 



Interference of light, 138. 



Intensity, magnetic, 247. 



Invisible light, Moser on, 188. 



Iodide of silver found natural, 304. 



Iodine, 304. 



Iridescent paper, 137- 



Iron, magnetic, 235. 



, soft, rendered magnetic, 241. 



, rusting, 306. 



Isomeric compounds, 291. 



Isomorphism, 290. 



Isothermic lines, 92. 



Isodynamic lines, 247- 



JONES, Rymer, on sponges, 345. 

 Joule on anhydrous salts, 287- 



on heat and motion, 18. 



KIRCHER'S Magnetism, 264. 

 Kupfiar on magnetic storms, 249. 



LAMINATION of clay by electricity, 226. 

 Land and sea, alternations of, 340. 

 Laplace's theory of the universe, 23. 

 Latent heat, 101. 



Lavoisier's theory of combustion, 305. 

 Law of gravitation, 30. 

 Lawson, letter from Mr., on germina- 

 tion of seeds, 375. 



Leaf, the functions of the, 369. 



Leaves of plants, action on air of, 311 . 



Le Verrier on planet Neptune, 32. 



Leyden jar, the, 198. 



Lias formations, 341. 



Liebig and organic chemistry, 284. 



Life and light, 52. 



, influence of light on, 153. 



dependent on light, 164. 

 , vegetable, 362. 



, mysteries of, 398. 

 Light, 118. 



essential to life, 39. 



of fixed stars, 122. 

 , transparency to, 124. 



, transmission of, through different 



media, 128. 



, absorption of, 125. 

 , interference of, 138. 

 , polarized condition of, 141. 

 , magnetization of, 146. 

 , artificial, 162. 

 , influence of, on plants, 373, 



and heat, correlation of, 64. 

 Lightning conductors, 215. 

 Lindley on the leaf, 370. 

 Lubbock, Sir J., on shooting stars, 22. 

 Lodes, mineral, electricity of, 225. 

 Luminous and r.ctinic rays distin- 

 guished, 176. 



MACHINE electricity, 209. 

 Magellanic clouds, 25. 

 Magnetic curves, 236. 



iron ore, 237. 



polarity, 237. 



points of convergence, 244. 



poles of the earth, 245. 



intensity, 247. 



storms, 249. 



lines of no variation, 243. 

 Magnetism, 235. 



induced, 238. 



influenced by heat, 242. 

 , universality of, 253. 



of gases, 259. 



induced by solar, rays 263. 



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