INDEX. 



553 



Banzi, on direction of shock in Mala- 

 pterurus, 398. 



Reciprocal conduction in electrical 

 organ of Malapterurus, 519. 



Belaxation, phenomena of, on electrica 1 

 excitation of cardiac muscle, 332 ; of 

 veratrine muscle, 335 ; is analogous to 

 that of sysfcolically contracted cardiac 

 muscle and tonically shortened ad- 

 ductor muscle of Anodonta, 342. 



Resistance, secondary, of moist porous 

 bodies, 168. 



Bitter, on law of contraction for the 

 thigh of the frog, no; his opinion as 

 to the nature of the change which 

 gives rise to the phenomena of break- 

 excitations, 116; on break tetanus in 

 nerve, 319. 



Sachs, researches on Gymnotus, 216 ; on 

 organ-current in Gymnotus, 438 ; on 

 tetanus of organ, 445 ; on secondary 

 electromotive actions of Gymnotus, 448 ; 

 on comparative strength of homodro- 

 mous and heterodromous currents, 457 5 

 on electromotive behaviour of skin, 482. 



Schultze, Max, as to nerves of electrical 

 organ of Malapterurus, 389. 



Secondary electromotive actions, of 

 ,the organ of Torpedo, 445 ; phenomena 

 of, essentially the same in the three 

 electrical fishes, 449 ; dependence of 

 these effects on the vitality of the 

 organ, 457 ; results of experiments on 

 these actions in Torpedo, 458-462. 



Tetanus, Hering's method of producing 

 it without metals, 130; Hering's 

 secondary tetanus, 147 ; its effect on 

 polarisability of muscle, 193; its in- 

 fluence on internal positive polarisation 

 of nerve, 210; Hermann on ' polarisa- 

 tion increment ' by tetanus, 211. 



Tigerstedt, changes of excitability pro- 

 duced in nerves by a constant current, 

 5 ; investigates special points in Pflu- 

 ger's doctrine of electro tonus, 14; his 

 method of experimenting, 16 ; his in- 

 strument for mechanical stimulation of 

 nerves, 1 8 ; experiments as to changes 

 of excitability produced by ascending 

 and descending currents, 21-42 ; criti- 

 cism of Hermann's theory of electro- 

 tonus, 44 ; contribution to the theory 

 of the break-contraction, 49 ; his ex- 

 perimental proof that the amplitude of 

 the break-contraction varies with the 



intensity of negative polarisation of a 

 motor nerve and is influenced by its 

 polarisability, 54-64; proposed simpli- 

 fication of Pfluger's law of contraction, 

 66 ; discussion of his theory, 66-70 ; 

 on the internal polarisation of nerves, 

 77 > methods of experiment on in- 

 ternal polarisation of nerve, 79 ; ex- 

 periments showing the dependence of 

 polarisation on the strength of the 

 polarising current, 83; and on the 

 duration of its closure, 86 ; his con- 

 clusions as to break-excitation the 

 same as Griitzner's, 102 ; on increase 

 of polarisation-current with duration 

 of polarising current, 105 ; on stimu- 

 lus of weak and strong current, 114. 



Torpedo, construction of organ, 371; 

 identity of its electricity with ordinary 

 electricity, 391 ; chemical reaction of 

 organ, 412 ; method of leading off the 

 shock, 423; effect of shock on man 

 compared with that of Malapterurus, 

 426 ; on iodide of potassium electro- 

 lysis by shock of Torpedo, 435 ; in- 

 vestigation of organ-current, 438 ; de- 

 pendence of the conductivity of the 

 organ on its 1 vitality, 457* on electro- 

 motive actions of the electrical nerves, 

 462 ; experiments on electromotive be- 

 haviour of skin, 482 ; polarisation of 

 organ by alternating currents, 497. 



Transmission time, defined, 172. 



Tschirjew, comparison of his experi- 

 ments on polarisation of muscle with 

 those of du Bois-Keymond, 247. 



Unipolar action, Hering's discussion of, 

 267. 



Veratrine, experiments on muscle 

 poisoned with it, 333; forms of con- 

 traction and relaxation on electrical 

 excitation of such muscle, 335 ; how to 

 poison muscle with it for experiments 

 on secondary electromotive phenomena, 

 343 ; discussion of experiments, 349- 



Vitality, loss of, its effect on polarisation 

 of nerve, 209. 



Volta, his theory as to breaking a con- 

 ducting circuit, 116; Tigerstedt's ex- 

 planation of voltaic alternatives, 70 ; 

 Griitzner discusses their influence, 100. 



Wundt, criticism of Pfliiger's doctrine 

 of electrotonus, 13. 



THE END. 



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