INDEX. 



ABSORPTION of heat by air, water, 

 and earth, 74. 



of light, 125. 



Acalephse, or phosphorescent animals, 



387. 

 Actinism, 166. 



producing chemical change, 174. 



and light antagonistic, 177- 

 , influence of, on plants, 372. 

 Action of presence Catalysis, 280. 

 "Active principles" of Newton, 11. 

 Adams on planet Neptune, 32. 

 Adiathermic bodies, 95. 



^Ereal currents dependent on heat, 80. 



chemical, 274. 

 Affinity, 292. 



Age of the world, 404. 



Aggregation, attraction of, 48. 



, crystalline, 58. 



Agonic lines, 244. 



Air, absorption of heat by, 74. 



density of the, 319. 

 Alchemy, Nature's, 293. 

 Aldiiii on animal electricity, 393. 

 Allotropic conditions of atoms, 43. 

 Allotropism, 330. 



Allotropy, 291. 



Alum, opacity to heat rays, 65. 

 Alpinus' theory of matter, 47. 

 Ammonites of the lias, 341. 

 Ammouiacal amalgam, 325. 

 Ampere's theory of magnetism, 239. 

 Analogy, dangers of reasoning by> 152. 

 Ancients' knowledge of magnetism, 



235. 

 Animals, phosphorescence of, 15^-. 



respiration of, 310. 



articulated, 388, 

 Animal magnetism, 267. 



Magnetic electricity, 211, 392. 



life, progress of, 338. 

 , phenomena of, 383. 



Arago on the surface of the sun, 123. 



on copying the Egyptian temples, 

 177. 



on magnetic variation, 246. 

 Arbor Diante silver tree, 261. 

 Aristotle on motion, 10. 

 Atmosphere, uses of the, 3 1C. 

 Atmospheric refraction, 322. 

 Atomic theory, 278. 



volumes, 287. 



Atoms, allotropic state of, 43. 

 Atom, the organic, 360. 

 , ultimate size of, 408. 

 , the, and its powers, 3. 

 Attraction, chemical, 275. 

 Aurora of the sun, 186. 



BACK'S account of Aurora, 249. 

 Balance of forces, 14. 

 Bartolin on Iceland spar, 140. 

 Beecaria, Father, on phosphorescence, 



160. rTtll., 



Bemnerel's experiments on electricity,. 



227. 



on ozone, 300. 



Bell on the ii'Tvrs, 391. 

 Belemnites, 341. 



Berkeley, Bishop, on motion, 10. 

 Berzelius on allotropy, 4-1 . 



on catalysis, 281. 

 Biela's comet, 26. 



Biot on polarization, 145. 



Bolognian stone, 161. 



Bouguer on the absorption of light by 



the atmosphere, 126. 

 Boutigny on heat, 107. 



