INDEX. 



5 2 5 



Polarisation of light, Circular, 411 



, Plane, 401 



, Plane of, 404 



, , Rotation of, 410 



of plates in galvanic element, 



17 



Polariscope in physiology, 408 

 Polarised light, Behaviour of 



muscle in, 408 

 Polariser, 402 

 Poles or electrodes, 17 



for xise in therapeutics, 157 



of magnets, 91 



Porous septa, Diffusion of gases 



through, 290 

 Positive electricity, 3 

 phase of muscle current, 127 



wave in liquids, 217 



Potential, 13 



, Difference of, 13 



Presbyopia, 388 



, Spectacles for, 388 



Press, Hydraulic, 190 

 Pressure, Atmospheric, 274 



, Blood, 2.J1 



, .Estimation of, 226 et feq. 



by liquids, Transmission of, 



189 



, Hydrostatic, 212 



of carbonic acid gas in lungs, 



293 



of oxygen in lungs, 23 



, Partial,flof a gas, 288 



, Resultant, 192 



Upward, 192 



J. 7 



Primary circuit, 35 



coil, 35 



colours, 342 



- tone, 437 



Principal axis of lens, 313 

 of mirror, 303 



planes of Iceland spar, 399 

 points, 378 



Principle of Archimedes, 195 



of TorriceDi, 207 



Prisms, 312 



for binocular microscopes, 370 



Production of the voice, 448 

 Propagation of waves, 217 



, Speed of, 218 



Pulleys, Movable, 498 



, Single, 497 

 Pulse alarm, 235 



, Suotty character of, 226 



tracings, 225 



Pulvermacher's chain pile, 153 



Pump, Air, 230 



, , Sprengel's, 282 



, Suction, 278* 



Punctum proximum, 387 



remotum, 387 



Purkinje's images, 386 



Quality of compound colonr, 344 



of musical sounds, 434 



Quartz, Effect of, on polarised 



light, 411 

 plate of Soleil, 414 



Radiation of heat, 459 



Radius of curvature of cornea, 380 



of crystalline lens, 380 



of mirror, 303 



Range of accommodation, 387 

 Rankin, 451 



Rapidity of nerve current, 129, 177 

 Ray, Extraordinary, 398 



, Ordinary, 398 

 Real foci of lens, 315 



of mirror, 305 



image formed by lens, 3f7 

 formed by mirror,,'306 



Reaumur's thermometric scale, 



468 



Receiving tambour, 186 

 Recomposition of rays of white 



light, 320 

 Reflection of light, 301 



, Angle of, 301 



by mirrors, 301 et seq. 



, Laws of, 301 



Reflector, neutral tint, Beale's, 



373 

 Refraction, Double, 397 



of eye, 380 



, Anomalies of, 388 



of light, 308 



, Angle of, 310 



by plate with parallel 



faces, 311 



by a prism, 311 



, Index of, 310 



, Laws of, 310 



Refrangibility of different rays of 



spectrum, 320 

 Registering tambour, 186 

 Registration, Graphic methods of, 



170 et seq. 

 Regnault, 272 



Regulation of animal heat, 483 

 Repulsion, Electiic, 5 



, Magnetic, 91 



, Mutual, of electric currents, 



37 



Reservoir, Charge of, 213 

 Residual magnetism, 53 

 Resinous electricity, 2 

 Resistance, 26 



