INDEX 585 



Positive after current, 317. 



Positive variation, action current, 316 ; polarization current, 

 146 ; polarizing current, 325. 



Prentice's method, numbering prisms, 435. 



Prisms, 413; construction, 413; numbering, 435; path of en- 

 tering ray, 413. 



Pulse, aortic regurgitation, 550 ; curve, 546 ; dicrotic, 545 ; 

 form, 544 ; frequency, 543 ; hardness, 544 ; low tension, 549 ; 

 pressure, 545; valvular disorders, 551, 552; volume, 545, 

 552. 



Pupil, accommodation, 473. 



REACTION of degeneration, 135. 



Reaction time, 382. 



Reflection, concave mirror, 405 ; convex mirror, 410 ; plane 

 mirror, 403. 



Reflex actions, 370 ; afferent impulses, 371 ; cornea, 374 ; inhi- 

 bition, 384 ; man, 374 ; pupil, 375 ; purpose, 381 ; segmen- 

 tal, 373 ; strychnine, 377 ; tendon, 375 ; threshold, 372 ; 

 throat, 382 ; vasomotor, 576. 



Reflex time, 382. 



Refraction, 410; concave lens, 422 ; convex lens, 416; convex 

 and cylindrical lenses, combined, 424 ; cylinders, 422 ; eye, 

 437 ; index, 412 ; prism, 413. 



Refractory period, 534. 



Respiration, mechanics of, 505. 



Respiration scheme, 505. 



Retina, reflection, 484. 



Rheochord, 42. 



Rheoscopic frog, 302, 306. 



Rheotachy graph, Hermann, 314. 



Rheotome, differential, Bernstein, 313. 



Ringer solution, 540. 



Ritter-Rollett phenomenon, 177. 



SALTS, influence on contraction of heart, 538. 



Saturation, 16. 



Scheiner's experiment, 469. 



Sciatic nerve, vasomotor fibres, 574. 



Secretion current, 320; negative variation, 321. 



Semi-permeable membrane, 17. 



Shortening in single contraction and in tetanus, 348. 



Sensation, effort. 400; general, 398; irradiation, 398; motion, 

 400 ; motor, 400 ; pain, 399 ; pressure, 393 ; taste, 401 ; tem- 

 perature, 390 ; tickle, 398 ; touch, 395 ; Weber's law, 395. 



Signal, electro-magnet, 105. 



Size, apparent, 456, 465. 



