494 



PHYSICAL SCIENCES. 



FRINGES. 



Fringes of coloured light bordering 

 shadows, 174, 175 ; produced by 

 interference of polarized rays, 194. 



Fulgorites, found in Silesia, 293. 



Fundy, the Gulf of, cross tides pour- 

 ing into, 94. 



GAGE, Mr., experiments of, on mag- 

 netism, 315. 



Gales. See Winds. 



Galileo, laws affecting music disco- 

 vered by, 145 ; his method of 

 finding distances of fixed stars, 388. 



Galle, Dr., Neptune's place commu- 

 nicated to, by Le Verrier, 62. 



Galloway, Mr., sun's motion proved 

 by, 405. 



Galvani, Professor, peculiar effects of 

 electricity suggested to, 297. 



Galvanism, phenomenon suggesting 

 the theory of, 297 ; batteries, 298, 

 300; heat and light evolved by 

 currents of, 300,304-; decomposition 

 and composition, 307, 308 ; applied 

 to plating and gilding, 309 ; effect 

 of heat on, 310 ; effect of, on the 

 senses, ib. ; fish exhibiting ana- 

 logous phenomena, 310, 311 ; 

 phenomena exhibited by currents 

 of, on magnets, 312, 314 ; in- 

 tensity of a current measured, 

 315 ; conditions obtaining a cir- 

 cuit in, 332. 



Galvanometer, the principle of its 

 construction, 315; experiment by 

 means of, identifying magnetism 

 and electricity, 322, 323. 



Gambart, M., parabolic elements of 

 a comet computed by, 367. 



Gamma Andromeda, colours of, 401. 



Aquarii, planetary nebula near, 



412. 



Hydras, a variable star, 391. 



Leonis, focus of a meteoric 



shower in, 422. 



Sagittarii, cluster of the Milky 

 Way round, 387. 



Virginis, eclipse in, 397 ; orbit 



of the revolving star determined, 

 398. 



Ganges, the, tidal wave at the mouths 

 of, 94. 



GOOD. 



Gardner, Mr., extent of diametrically 

 opposite lands estimated by, 244.' 



Gases, conditions retaining matter in 

 the form of, 104, 105 ; combina- 

 tions of, 111; transmission of 

 radiant heat through, 258 ; expan- 

 sion of, 271 ; voltaic spectrum 

 modified by, 303; effect of heat 

 on the conducting powers of, 

 309. 



Gassiot, Mr., experiments of, on the 

 electric discharge, 306 ; connexion 

 between magnetism and light dis- 

 covered by, 321 ; electric apparatus 

 improved, 328. 



Geneva, the Lake of, experiment on 

 the velocity of sound in, 135. 



Gensanne, M., increasing temperature 

 of mines tested by, 228. 



Geographers, lunar motions import- 

 ant to, 42. 



Geological changes, probable cause of, 

 77. 



Geology, the lessons of, 326. 



Georgia Island, S-, excess of cold in, 

 over corresponding latitudes, 241. 



Germany, shooting stars seen from, 

 421. 



Gibraltar, the Straits of, turning 

 aside the tidal wave, 98. 



Giromagny, temperature of the lead- 

 mines of, 228. 



Glass, effect of cohesion on plates of, 

 106 ; musical notes elicited from 

 rods and plates of, 144-147 ; trans- 

 mission of waves of light in, 177 ; 

 polarizing light, 18.4, 185 ; ellip- 

 tical polarization produced by. 193, 

 194; used in photography, 207; 

 impressions on, from bodies in con- 

 tact with, 220 ; impressions on, 

 traced by electricity, 221 ; trans- 

 mission of radiant heat by, 259 ; 

 by coloured, 261, 262 ; its temper 

 altered by magnetism, 352, 353. 



Globular clusters of nebulae, 413- 

 415. 



Glow-discharge observed by Captain 

 Bonnycastle, 295, 296. 



Gold, action of, on light, 173. 



Good Hope, the Cape of, icebergs 

 drifted to, 101. 



