5 2 4 



Pit YSIOL OGICA L PHYSICS. 



Muscle, Experiments on stimula- 

 tion of, 62 et seq. 



, Inherent irritability of, 75 



, Latent period of stimulation 



of, 129, 177 



, Law of contraction of, 89 



preparation, 63 



, Secondary contraction of, 72 



telegraph, 62 



Myogrnph, Pick's, 180 



Helmholtz's, 175 



Marey's, 178 



Pendulum, 180 



Pflueger's, 175 



Simple, 175 



Myopia, 388 



Myopolar, 82 



auelectrotonus, 86 



katelectrotonus, 86 



Nebenschliessung, 56 

 Needle, Magnetic, 93 

 , Thermo-electric of Helm- 



holtz, 147 

 Neef's hammer, 42 

 Negative electricity, 3 

 phase of electromotive force 



of muscle current, 127 

 variation of muscle current, 



118 

 Neutral tint reflector, Beale's, 367 



- zone, 91 

 Newton's rings, 408 



theory of light, 296 



Nicol's prism, 399 

 Nicholson's hydrometer, 201 

 Nobili's galvanometer, 97 



law of contraction, 87 



thermo-electric pile, 144 



Nodal points, 378 

 Nodes, 437 

 Non-conductors, 4 

 Nou-polarisable electrodes, 119 



Octave, 428 

 Oersted, 94 

 Ohm, The 34 



, Law of, 27 



Olefiant gas, Atherrnancy of, 462 

 One-fluid theory of electricity, 3 

 Opaque, 461 

 Open organ pipe, 443 

 Ophthalniorneter, 395 

 Ophthalmoscope, 351 



, used without lenses, 352 



, with erect image, 353 



, with inverted image, 354 



Optical axis of the eye, 380 

 centre, 313 



Optical constants of Gauss, 378 



instruments, 349 et seq. 



instrument, The eye as an, 



374 



Ordinary ray, 398 

 Organ pipe, 445 

 Osmometer, 252 

 Osmosis, 251 

 Otoscopes, 422 

 Overtones, 438 

 Oxyhsemoglobin, Absorption 



bands of, 326 



Pantograph," 187 

 Paradox, Hydrostatic, 191 

 Parallel forces, 493 

 Parallelogram of force, 491 

 Paramagnetic, 94 

 Partial notes, 438 



pressure of a gas, 288 



Pascal's law, 189 



Pendulum, Myographion, 180 



, Simple, 505 



Period of vibration, 296 



Periodic time of'pendulum, 50o 



Peripheral lesion, 162 



Pfaff, 87 



Pflueger's law of contraction, 87 



myograph, 175 



trip or fall hammer, 68 



Phakoscope of Hemboltz, 3S5 

 Phase of vibration, 298 

 Phosphorescence, 336338 



of sea, 339 



Photography, 336, 348 

 Physiological optics, 296 

 Piezometers, 189, 212, 226 

 Pile, Voltaic, 14 



, Forms of (See Element) 



Pipette, 279 

 Pincus' cell, 23 

 Pitch of sound, 423 

 Pith-ball, 3 

 Plane mirrors, 301, 350 



polarised light, 401 



Poggendorff's compensation 



method, 120 

 Point, Boiling, 467, 471 



, Freezing, 467 



of fusion, 470 



of saturation of liquids, 248 

 Points of derivation, 32 

 Poiseuille's experiments on flow 



of fluids in capillary tubes, 215 



baemadynamometer, 227 

 Polarisation of electrodes, 111 

 of light, 397 



, Angle of, 404 

 by reflection, 403 



