INDEX. 



5 21 



of, 



Grove's element, 21 

 Gyrotrope, 59 



Hsemadynamometer, 227 

 Hsematin, Absorption band 



327 

 Hseniosrlobin, Absorption bands 



of, 327 

 , Methods of demonstrating 



bands of, 333 

 Hsernodromometer, 230 

 Hsetnotachometer, Vierordt's, 232 

 Hales, 227 

 Hall, 346, 359 

 Harmonic series, 436 

 Hartnack's micro-spectroscope, 



329 



Harzer, 256 

 Hauy's bar, 107 

 Heat, Absorption of, 461 

 , Amount of, liberated by 



body, 482 



, Capacity for, 476 



, CondiTCtion of, 456 



, Convection of, 458 



, Emission of, 461 



, Expansion by, 464 



, Latent, 471 



. , of fusion, 471 



-, of vapour, 473 



, Mechanical energy converted 



into, 452 



Equivalent of, 453 



, Nature and sources of, 451 



, Radiation of, 459 



, Regulation of, of body, 483 



, Specific, 476 



, , of the animal body, 



477 



, Unit of, 455 



Heidenhain's tetanometer, 74 



Height of homogeneous atmo- 

 sphere, 274 



Helmholtz, Colour sensation^ 

 theory of, 343 



, Modification of Du Bois' 



incluctorium, 47 



, Myographion of, 175 



on difference tones, 433 



- on mixture of colours, 340 

 on visual angle, 382 



on vowel sounds, 449 



, Ophthalmometer of, 395 



, Ophthalmoscope of, 351 



, Phakoscope of, 385 



, Resonators of, 444 



, Siren of, 427 



Thermo-electric needle of, 



Herschell, 334 



Homocentric, 391 



Hooke, 451 



Hoppe Seyler on spectrum of 



blood, 328 

 Hujghen's eye-piece, 362 



undulatory theory, 296 



Hydraulic press, 190 

 Hydrodynamics, 188, 207 

 Hydrometer, Fahrenheit's, 202 



, Nicholson's, 202 



of constant volume, 203 



weight, 203 



Hydrokinetics, 188 

 Hydrostatic balance, 198 



paradox, 191 



pressure, 212 



Hydrostatics, 188 

 Hypermetropia, 388 



Iceland spar, 397, 402 

 Idioelectrics, 4 

 Images, Diffusion, 383 



, Formation of, by lenses, 316 



, , by mirrors, 306 



- , Real, 307 



, retinal, Size of, 381 



Size of, formed by lenses, 



, formed by mirrors, 308 



318 



-, Virtual, 307 



Imbibition, 246 

 Inclination of magnet, 93 

 Indifference point, 91 

 Induced currents, 35 



, Direction of, 36 



, Effects of, on muscle, 



64 

 Induction coils, Reymond's, 42 



, Ruhmkorfi's, 39 



Electric, 34 



-, apparatus, 154 



Electrostatic, 6 

 Magnetic, 92 

 Magneto-electric, 38 

 -, Apparatus for, 156 



Unipolar, 57 



147 



Insulators, 5 

 Intensity of colour, 344 



of electric current, 25 



of light, 301 



of sound, 423 



Interference of light, 397 



of sound, 429 



Interrupted currents, Effects of, 



on muscle, 65 

 Intervals in music, 427 

 Irregular astigmatism, 394 

 Isotropous, 402 



