584 INDEX 



NEGATIVE variation, 321 ; electrotonic currents, 325 ; secretion 



currents, 321. 

 Nerve, action current, 315 ; cervical in frog, 558 ; conducts in 



both directions, 181; conductivity, 120; conductivity and 



irritability, 172; demarcation current, 295; drying, 149; 



electrical resistance, 327; electromotive phenomena, 295; 



impulse, speed of, 184; induction, 69; inhibitory, 558; 



irritability, 1 1 6 ; irritability compared with muscle, 179; 



irritability, different points, 180 ; irritability, specific, 179 ; 



polarization, 323 ; polar stimulation, 113, 131 ; stimulated by 



own demarcation current, 296. 

 Nerve-muscle preparation, 4. 

 Nicotine, action on heart, 563. 

 Nitrite of amyl, 550. 

 Normal saline solution, 165. 



OPHTHALMOSCOPE, 489. 



Ophthalmoscopy, 484 ; direct, 490 ; indirect, 496. 

 Optic nerve, action current, 318. 

 Optical box, 404. 



Opening and closing contraction, 98, 125 ; tetanus, 147. 

 Ordinates, 91. 

 Osmometer, 18. 



Osmotic pressure, 16; blood-corpuscle method, 22; blood 

 serum, 21. 



PAPER, smoked, method of using, 78. 



Paradoxical contraction, 328. 



Paramecium, galvanotropism, 137. 



Partial pressure, 13. 



Periodic contraction from chemical stimulation, 165 ; galvanic 

 stimulation, 144. 



Peripheral resistance, 521. 



Permeability, 24. 



Pithing, 97. 



Plasmolysis, 20. 



Plethysmograph, 545. 



Point' cardinal, cornea, 440; cardinal, crystalline lens, 445; 

 cardinal, eye, 439, 451 ; far, accommodation, 479 ; far, deter- 

 mination, 479 ; near, accommodation, 480 ; near, determina- 

 tion, 480; nodal, 420; nodal, crystalline lens, 447; nodal, 

 eye, 453 ; principal, crystalline lens, 450 ; s, 449, 453. 



Polar excitation, 148; fatigue, 147; inhibition, 153, 155; in- 

 jured muscle, 151 ; refusal, 292; stimulation, 101, 113, 159. 



Polarization, 46; current, 51, 145; increment, 325; positive 

 variation, 146. 



Pole-changer, 49, 50. 



