520 



PHYSIOLOGICAL PHYSICS. 



Fizeau's method of calculating 



the velocity of light, 299 

 Fluorescence, 336 

 Focal distance of lens, 313 

 of mirror, 303 



interval of Sturm, 392 

 points, 392 



Focus of lens, Conjugate, 314 

 Principal, 315 

 Real, 315 

 Virtual, 315 



of mirrors, Conjugate, 304 

 Principal, 303 

 Real and virtual, 305 



Force, 487 



, Composition of, 492 



, Electromotive, 17, 27, 120 



, Measurement of, 488 



, Parallelogram of, 491 



, Eepresentation of, 490 



, Resultant, 490 



Formation of images by lenses, 



316 



by mirrors, 306 



Formula for focal distance of 



lenses, 30t 



for ophthalmometer, 396 



for size of image formed by 



lenses, 318 

 3J8 



formed by mirrors, 



of retinal image, 381 



for pendulum, 506 

 for spectacles, 3fe8, 390 



Foucault's regulator, 111 

 Foulis' auto-laryngoscope, 351 

 Frankland, 455 

 Franklin, 3 



Fraunhofer's lines, 321 

 Freezing mixtures, 472 



point, 467 



temperature, 474 



Freqiiency of a vibration, 298 

 Friction, Coefficient of, in diffusion 



of gases, 290 



key, Galvanic, 55 



Frictional electricity, 1 



machines, 9 



, Holtz', 9 

 Frog-heart apparatus of Ludwig, 



236 



Frog-interrupter, 129 

 Fundamental colours, 341 

 Fusion, 470 

 , Latent heat of, 471 



Gaiffe's cell, 23 



Galvani, theory cf animal electri- 

 city, 14 



Galvanic battery, 24 



current, Effect of in osmosis, 



258 



elements, 19 et seq. 

 keys, 54 



Galvanism, 149 



, Application of, in medicine, 



158 

 Galvanometer, Aperiodic, 110 



Astatic, of Nobili, 98 



Differential, 103 



its use in the measurement 



of 



resistances, 138 



of temperatui'e, 145 

 of time, 128 



in physiology, HO 



, Reflecting, of Sir W. Thom- 

 son, ILO 



-, of Wiedemann, 105 



shunt, 103 

 -, Tangent, 96 



Gas, Absorption of, by liquids, 



291 

 , Coefficient of absorption of, 



291 



, Compressibility of, 271 



, Density of, 273 



, Diffusion of. 283 



- through porous septa, 



290 



-, Elastic force or expansibility 

 of, 270 



, Liquefaction of, 273 

 , Olefiant, 462 



-, Partial pressure of, in a mix- 



ture, 288 

 sphygmoscope, 235 

 , Unequal compressibility of, 



272 

 -, Weight of, 273 



Gaseous state, 270 



Gauss' optical constants, 378 



Geissler's tubes, 339 



Gilbert, 1 



Glass, Canary, 337 



, Uranium, 337 



Glowworm, 339 



Graham on absorption of gases 



by liquids, 291 

 on gaseous diffusion, 290 



on liquid diffusion, 249 

 Graphic method, 170 



registration, 170 



Gravity, Centre of, 196, etc. 



element, 20 



, Specific, 197 



, , of pure milk, etc., 206 



Grenet's element, 22 

 Grotthiis, 52 



