ANALYTICAL INDEX. 



[NOTE. The volumes are indicated by the numerical letters i., ii.. and the pages hy fi&urei. A 

 few changes in the pages of vol. i., require the reader who uses this index, to deduct 6 pages after 

 page 266. vol. i., and 30 pages after page 328, vol i.] 



A. 



Action and reaction, ii. 197-204. 



^Epinus, his works, i. 133. 



Air, elasticity of, ii. 41-60; substance and 



color of, i. 193; weight of, i. 194; inertia 



of, i. 195; impenetrability of, i. 196 ; ii. 31. 

 Air, elasticity and compressibility of, i. 198 ; 



ii. 31. 



Air-drawn dagger, illusion of, i. 264. 

 Air-pump, the, ii. 47-56, 423. 

 Alcohol thermometer, ii. 138. 

 Aldebaran, ii. 338. 

 Ampere on electro-magnetism, ii. 122 ; his 



theory of terrestrial magnetism, ii. 125. 

 Analysis of the heavens, ii. 378. 

 Anecdote of Napoleon, i. 369. 

 Animal and vegetable life sustained by the 



atmosphere, i. 59. 



Ancient method of directing lightning, ii. 99. 

 Animalcules, their minute organization, &c., 



ii. 25. 



Animal electricity, i. 364. 

 Annual motion of the earth, i. 480. 

 Annual variation of the electricity of the 



air, ii. 154. 

 Apparatus for observing the electricity of 



the atmosphere, ii. 149, 150. 

 < Appearance accompanying meteors, i. 460. 

 ; Arago shows how comets may be made to as- 

 sume different degrees of brightness, i. 517. 

 Ara-jo's observations on silent lightning, i. 



552; his calculation of the quantity of 



lightning drawn down by a conductor, ii. 



104. 



Arcturus, ii. 339. 

 Arms and feet, motions and positions of, ii. 



234. 

 Arms of the lever, ii. 247. 



j Artificial freezing, Leslie's method of, ii. 171. 

 Artificial light, heat of, ii. 193. 

 Artificial magnets, construction of, ii. 113. 

 Astronomical and arithmetical calculations, 

 i. 183. 



Atmosphere, the, i. 58-64, 193-202; limited 

 height of, i. 198 ; ordinary state of, ii. 151. 



Atmosphere of the planets, i. 60; of Saturn, 

 i. 246 ; of Ceres and Pallas, i. 207. 



Atmosphere, various states of (vide Atmo- 

 spheric Electricity), ii. 149. 



Atmospheric air, i. 193-202. 



Atmospheric currents at Jupiter, i. 241. 



Atmospheric electricity, i. 137; ii. 149-160. 



Atmospheric engine invented by Newcomen, 

 ii. 411. 



Atmospheric pressure, i. 295, 296 ; probably 

 first discovered from the effects of suction 

 by the mouth, i. 285 ; the pump cannot 

 act in the absence of atmospheric pres- 

 sure, 11, 53 ; effects of atmospheric pres- 

 sure at boiling point, ii. 303 ; upon the 

 boiling of water, ii. 305. 



Atmospheric tides, i. 409. 



Atoms, or molecules, ii. 22. 



Atoms, ultimate, ii. 26. 



Attraction and repulsion of electric cur- 

 rents, law of, ii. 120. 



Aurora Borealis, the, i. 89-100; the effect 

 of atmospheric electricity, i. 137. 



Aurora, phenomenon of, noticed by the 

 ancients, i. K)0. 



Auroral character of falling stars, i. 98. 



