INDEX. 



ACOUSTICS cultivated by Py- 

 thagoras and Aristotle, page 

 248. 



^Epinus, his laws of equi- 

 librium of electricity, 332. 

 'Aeriform fluids, liquids kept 

 in a state of vapour, 321. 



Agricola, George, his know- 

 ledge of mineralogy and 

 metallurgy, 112. 



Air, compressibility and elas- 

 ticity of; limitation to the 

 repulsive tendency of, 226. 

 Weight of, unknown to the 

 ancients, 228. First perceiv- 

 ed by Galileo, 228. Proved 

 by a crucial instance, 229. 

 Equilibrium of, established, 

 231. Dilatation of, by heat, 

 319. 



Air-pump, discovery of, 230. 



Airy, his experiments in Dol- 

 coath mine, 187. 



Alchemists, advantages de- 

 rived from, 11. 



Algebra, 19. 



Ampere, his electro-dynamic 

 theory, 202. Utility of, 

 203. 324. 



Analysis of force, 86. Of 

 motion, 87. Of complex 

 phenomena, 88. 



Anaxagoras, philosophy of, 

 107. 



Animal electricity, 337. 



Arago, M. his experiment 

 with a magnetic needle and 

 a plate of copper, 1 57. 



Archimedes, his practical ap- 

 plication of science, 72. 



His knowledge of hydro- 

 statics, 231. 



Arfwedson, his discovery of 

 lithia, 158. 



Aristotle, his knowledge of 

 natural history, 109. His 

 works condemned, and sub- 

 sequently studied with avi- 

 dity, 111. His philosophy 

 overturned by the disco- 

 veries of Copernicus, Kep- 

 ler, and Galileo, 113. 



Arithmetic, 19. 



Art, empirical and scientific, 

 differences between, 71. 

 Remarks on the language, 

 terms, or signs, used in 

 treating of it, 70. 



Assurances, life, utility and 

 abuses of, 58. 



Astronomy, cause of the slow 

 progress of our knowledge 

 of, 78. Theory and prac- 

 tical observations distinct 

 in, 132. An extensive ac- 

 quaintance with science and 

 every branch of knowledge 

 necessary to make a perfect 

 observer in, 132. Five 

 primary planets added to 

 our system, 274. Posi- 

 tions, figures, and dimen- 

 sions of all the planetary 

 orbits now well known, 

 275. 



Atomic theory, 305. Advan- 

 tage of, 306. 



Atomic weights of chemical 

 elements, 306. 



Attraction, capillary, or capil- 



