366 



of magnetism, 93. Univer- 

 sality of, 329. Effects of, 

 330. Activity of. 331. 

 Equilibrium of, 332. Pro- 

 ductive of chemical decom- 

 position, 338. 



Empirical laws, 178. Evils 

 resulting from, 1 79. 



Encke, professor, his predic- 

 tion of the return of the 

 comet so many times in suc- 

 cession, 156. 



Englefield, sir H., his ana- 

 lysis of a solar beam, 314. 



Equilibrium maintained by 

 force, 222. 



Erman, professor, his opinion 

 of the effects of the voltaic 

 circuit, 340. 



Euler, his improvement on 

 Newton's theory of sound, 

 247. 



Experience, source of our 

 knowledge of nature's laws, 

 76. 



Experiment, a means of ac- 

 quiring experience, 76. 

 Utility of, 151. 



Facts, the observation of, 118. 



Faujas de St. Fond, imaginary 

 craters of, 131. 



Fluids, laws of the motion 

 of, 181. Compressibility 

 of, 225. Consideration of 

 the motions of, more com- 

 plicated than that of equi- 

 librium, 235. 



Force, analysis of, 86. The 

 cause of motion, 149. Phe- 

 nomena of, 22 1 . Molecular 

 forces, 245. 



Fourier, baron, his opinion 

 that the celestial regions 

 have a temperature, inde- 

 pendent of the sun, not 



greatly inferior to that at 

 which quicksilver congeals, 

 157. His analysis of the 

 laws of conduction and ra- 

 diation of heat, 3 1 7. 



Franklin, Dr., his experi- 

 ments on electricity, 332. 



Fresnel, M., his mathematical 

 explanation of the pheno- 

 mena of double refraction, 

 32. His improvement on 

 lenses for lamps of light- 

 houses, 56. His opinions 

 on the nature of light, 207. 

 His experiments on the in- 

 terference of polarized light, 

 261. His theory of polar- 

 ization, 262. 



Friction, a source of heat, 3 1 3. 



Galileo, celebrity of, for his 

 knowledge of science, 72. 

 His exposition of the Aris- 

 totelian philosophy, 1 10. 

 His refutation of Aristotle's 

 dogmas respecting motion, 

 his persecution in conse- 

 quence of it. 113. His 

 knowledge of the acceler- 

 ating power of gravity, 168. 

 His knowledge of the 

 weight of the atmosphere, 

 228. 



Galvani, utility of his dis- 

 coveries in electricity, 335. 

 His application of it to 

 animals, 336. 



Gay-Liissac, his examination 

 of gases and vapours, 319. 



Generalization, inductive, 1. 

 90. 



Geology, 281. Its rank as a 

 science, 287. 



Geometry, axioms of, an ap- 

 peal to experience, not cor- 

 poreal, but mental, 95. 



