492 



PHYSICAL SCIENCES. 



EUROPE. 



Europe, atmospheric wave passing 

 over, 121 ; causes of variation of 

 climate in, 244 ; separation of 

 isothermal lines in high latitudes 

 of, 245 ; differences of latitude en- 

 joying the same mean temperature, 

 246 ; indigenous productions of, 

 249 ; number of indigenous pro- 

 ductions common to Australia and, 

 251 ; number of species of forest 

 trees, 252. 



Eudoxus, Plato's contemporary, astro- 

 nomical observation of, 88. 



Evaporation, conditions affecting, 269, 

 270. 



Evarest, Colonel, arc of the meridian 

 measured by, 48. 



Excentricity of planetary orbits mea- 

 sured, 17. 



Expansion, universal law of, 271 ; 

 accuracy in measurement ensured 

 by laws of unequal, 272; of crystals, 

 272, 273; theory of, 275, 277 ; of 

 steam, 278 ; by electricity, 285. 



Extra -tropical winds, 124. 



FABRICITJS, the comet of 1556 ob- 

 served by, 370 ; variable star, 390. 



Fahrenheit, mode of ascertaining 

 heights proposed by, 120. 



Falling stars, 420; theories of,, 422, 

 423. 



Faraday, Dr., gases reduced to liquids 

 by, 105 ; experiments testing 

 chemical affinity, 111; instance of 

 cohesive force inducing chemical 

 combination, 112; experiments on 

 vibrations producing colour, 173 ; 

 influence of dialectrics, 286 ; chemi- 

 cal origin of electricity defended 

 by, 300 ; electro-chemical decom- 

 position defined by, 308 ; remarks 

 of, on conduction of voltaic elec- 

 tricity, 309 ; experiments on mag- 

 netic rotation, 313; experiment 

 magnetizing polarized light, 318, 

 319 ; importance of his experiment, 

 320 ; experiment establishing the 

 identity of magnetism and elec- 

 tricity, 322, 323; his magnetic 

 battery, 324, 325; aid given by, 

 in construction of telegraphs, 326, 



FLORENCE. 



328 ; electricity produced by rotn- 

 tory motion explained, 330 ; his 

 classification of substances accord- 

 ing to magnetic qualities, 332 ; 

 quotation from, on conservation of 

 force in electricity, 334; mag- 

 netism raised to a new science by, 

 335 ; the magnet as represented by, 

 338 ; experiment determining the 

 forms of magnetic lines of force, 

 339, 340 ; accidental electro-mag- 

 netic combinations pointed out by, 

 342; his discovery of diamagnetism, 

 347 ; experiments on magnetic 

 action in crystals, 349 ; observa- 

 tions on influence of heat in mag- 

 netism, 352 ; definition of gravity 

 questioned by, 354, 355 ; mag- 

 netism of the ethereal medium 

 tested, 356. 



Fauna, distinct, of separate regions, 

 254, 255. 



Faye, M., his conception of the sun's 

 constitution, 41 ; his theory of 

 phenomena observed in eclipses, 42 ; 

 comet of 1843 discovered by, 361. 



Fiedler, Dr., fulgorites exhibited by, 

 293. 



Fire, chemical combination producing, 

 270. 



balls, theory of, 421. 



Fires, central, subterranean, 231- 

 237. 



Fish, phosphorescent, 294, 295 ; elec- 

 tric, 310. 



Fixed stars. See Stars. 



Fizean, M., decisive experiment in 

 proof of the undulatory theory of 

 light accomplished by, 202. 



Flame, chemical combination evolv- 

 ing, 270, 271. 



Flames, lambent, caused by elec- 

 tricity, 294. 



divergent from the nucleus of a 



comet, 364. 



Fletcher, Mr., periodic time of y 



Virginis determined by, 398. 

 Flora of the Himalaya, 250 ; distinct, 

 in separate regions, 251 ; condi- 

 tion establishing distinct, in islands, 

 252. 

 Florence, comet discovered from, 378. 



