r 



5 38 



ANALYTICAL INDEX. 



B. 



Ball lightning, i. 460, 538, 540, 548. 

 Balance of torsion, i. 136. 

 Balance-wheel of a watch, ii. 267. 

 Barking trees, ii. 78. 

 Barometer, the, i. 285-304; how to secure 



the requisites for a good one, i. 288; di- 

 agonal barometer, i. 292; wheel barom- 

 eter, i. 292. 

 Barometer-gauge, the, ii. 49; applied to 



steam-engine, ii. 506. 

 Barometric column, diurnal variation of the, 



i. 410. 



Barton's piston, ii. 488, 489. 

 Beccaria's observations on electricity, i. 127. 

 Becquerel's objections to Biot's theory of 



the aurora, i. 97 ; his experiments in the 



higher stratum of air, ii. 157. 

 Beer and Miidler's telescopic views of the 



moon, i. 320. 

 Beer's observations on the planet Mars, i. 



153. 

 Berard's experiments on the subject of the 



radiation of heat, i. 443. 

 Bessel's discovery of the Parallax, i. 589. 

 Binary stars, ii. 365. 

 Biot's excursion to the Shetland isles to 



observe the aurora, i. 90 ; his theory and 



explanation of it, i. 95. 

 Biela's comet, i. 425. 

 Bituminous matter accompanying a lightning 



discharge, i. 551. 

 Bladder burst by atmospheric pressure, ii. 



52 ; by elasticity of air. ii. 52. 

 Blinkensop's patent locomotive engine, ii. 



531 ; his patent for the application of the 



rack rail, ii. 531. 

 Blood, globules of the, ii. 25. 

 Blue sky, the cause of, i. 194. 

 Boiler, steam, ii. 496-513. 

 Boilers and their appendages, ii. 407. 

 Boiling points and latent heats in other 



liquids than water, ii. 312. 

 Boiling, the process of, ii. 298. 

 Bread panic in London, i. 160. 

 Breathing i. 299. 

 Brewster's investigations on the subject of 



the theory of colors, i. 577. 



Broken planets, fragments of, i. 206. 

 Brunton's self-regulating furnace, ii. 513. 

 Burning-glass, ii. 192. 



C. 



Calorific effects of the srn's rays, i. 490. 



Calorific powers cf the secindary pile, i. 377. 



Canton's experiments in eiectric.ty, :. 130. 



Capstan, ii. ?~>1. 



Captive balloons, ii. 1C4. 

 $ Carriage, centre of pravitv of a, ii. 233. 

 j Cart-.irlght's engin3, . : i. 485 ; hie piston, ^87. 

 ) Castor, ii. 342. 



I Cavendish's experiment o.i the weights of 

 bodies, i. ; 



Celestial globe, uses of, ii. 342. 



Central eclipse of the sun, i. 69, 83. 



Centre of gravity, ij. 221-240; how found, 

 ii. 223. 



Centrigrade thermometer, ii. 138. 



Ceres discovered by Piazzi, i. 206. 



Ceres and Pallas, magnitude and appear- 

 ance of, i. 208. 



Centrifugal force, on what it depends, ii. 466. 



Charged clouds, action of on light bodies, 

 i. 607. 



Chemical action, effects of, discovered by 

 Davy, i. 372. 



Chemical changes operated by lightning, ii. 

 65. 



Chemical combination, ri. 321. 



Chronometer, ii. 264 ; uses of the, i. 569- 

 570. 



Clairaut applies the principles of gravitation 

 to Halley's comet, i. 182; his researches, 

 i. 182 ; predicts the discovery of the planet 

 Herschel, i. 184. 



Climate and temperature of places changed 

 by the presence or absence of the atmo- 

 sphere, i. 64. 



Clock, floral, i. 56. 



Clouds, i. 60 ; ii. 175 ; character and elec- 

 tric charge of, i. 532. 



Clouds, luminous, i. 545, 546. 



Coal, analysis of, ii. 493. 



Cocks and valves, ii. 474. 



Cold fusion, Franklin's, ii. 66. 



Cold, supposed rays of, i. 453. 



Colors, theory of, i. 575-582. 



Combustion, i. 334 ; ii. 321-328, 494 ; with- 

 out flame, ii. 324; of gas in flues, ii. 41'^. 



Combustion and combustibles, supporters of, 

 ii. 323. 



Combination cf levers, ii. 252. 



Comet, Halley's, i. 171-190. 



Comets of 1811 and 1680, i. 523; of 1769 

 and 1843, i. 524 ; of 1844, i. 527; motion 

 of comets, i. 173 ; how they may be rec- 

 ognised, i. 173. 



Comets' dimensions enlarged as they recede 

 from the source of heat, i. 517. 



Comets, periodic, i. 423-134. 



Comets, physical constitution of, i. 513-52S. 



Common bellows, i. 299. 



Comparative brightness of the stars in rela- 

 tion to the sun, i. 593. 



Compression of steam without loss of heat, 

 effect of, ii. 310. 



Composition and resolution of ftrce, i. 207- 

 218. 



Compressibility, ii. 29. 



Concave reflectors, i. 263. 



Condenser, the, discovered by Wilkie and 

 ^Epinus, and perfected by Volta, i. 134; 

 ii. 59. 



Condensation, i. 331. 



Condensation of steam in the cylinder, ii. 4C1. 



Condensation, separate, ii. 422. 



Condensing syringe, the, ii. 56. 



Conducting bodies, effects of, on lightning, 

 ii. 73 ; protection afforded by, ii. 74. 



