368 



elude the whole scale of 

 variation of which the quan- 

 tities in question admit, 1 77. 



Induced electricity, 333. 



Inertia, 223. 



Iodine, discovery of, 50. Effi- 

 cacy of, in curing goitre, 5 1 . 



Isomorphism, law of, 1 70. 



Kepler, effect of his discover- 

 ies on tne Aristotelian phi- 

 losophy, 1 1 3. Nature of his 

 laws of the planetary sys- 

 tem, 178. Proofs of the 

 Newtonian system, 179. 



Knowledge, physical facts il- 

 lustrative of the utility of, 

 45. Diffusion of, how 

 to take advantage of in the 

 investigation of nature, 135. 



Lagrange, his improvements 

 on Newton's theory of 

 sound, 247. His astrono- 

 mical researches, 275. 



Lamp, safety, 55. 



Laplace, his explanation of 

 the residual velocity of 

 sound and confirmation of 

 the general law of the de- 

 velopementof heat by com- 

 pression, 172. His astro- 

 nomical research, 275. His 

 experiments on the dilata- 

 tion of bodies by heat, 319. 

 His study of specific heat, 

 323. Latent heat, 323. 



Laws, inductive, 171. Ge- 

 neral, 19H. How appli- 

 cable, 199. Illustrated by 

 the planetary system, 301 . 

 Empirical laws, 178. 



Lavoisier, his improvements 

 in chemical science, 302. 

 Experiments on dilatation 

 of bodies by heat, 319. 



His investigation on spe- 

 cific heat, 3'J3. 



Light, refraction of, 30. 

 Double refraction of, 31. 

 Polarization of, 254. 



Light and vision, ignorance 

 of the ancients respecting, 

 2-19. 



Lighthouse, 56. 



Lightning, how to- judge 

 philosophically of it, 12O. 

 Returning stroke of, 121. 



Liquids, cohesion, attraction 

 and repulsion of the par- 

 ticles of, 227. Differ from 

 aeriform fluids by their co- 

 hesion, 233. The Florentine 

 experimenton; experiments 

 by Canton, Perkins, Oer- 

 sted, and others on, 235. 

 Obscurity of the laws of 

 dilatation of, S2O. 



Linnaeus, his knowledge of 

 crystalline substances, 239. 



Logic, 19. 



Lyell's Principles of Geology, 

 extract from, 146. 



Magnetism may be caused by 

 electricity, 93. Offers a 

 " glaring instance" of po- 

 larity, 326. Experiments 

 illustrative of, 327. 



Malus, a French officer of 

 engineers, discovers the po- 

 larization of light, 132. 

 258. 



Man, regarded as a creature 

 of instinct, 1. Of reason 

 and speculation, 3. His will 

 determined by causes and 

 consequences, 6. Advan- 

 tages to, from the study of 

 science, 7. His necessity 

 to study the laws of nature 

 illustrated, 66. Happiness 



