55* 



INDEX. 



Leading-off cover, for experiments on 

 electrical fish, described, 380 ; modifi- 

 cations of, 399, 401 ; further descrip- 

 tion of, 420. 



Malapterurus, secondary electromotive 

 phenomena of its organ discussed, 

 2ii ; described byBilharz, 370; habits 

 in confinement, 374; experiments on 

 its shock, 390-397 ; its immunity from 

 electric shocks, 404; experiments on 

 electrical nerve 410; chemical reaction 

 of organ, 41 2 ; leading-off cover for 

 experiments on, 420 ; no organ-current 

 was found by du Bois in Malapterurus, 

 481 ; irreciprocal conduction in, 534. 



Matteucci, experiments on nerve polar- 

 isation, 197; error as to origin of 

 electricity in brain of Torpedo, 428. 



Meissner, vindication of Pfliiger, 6. 



Munk, his error in his criticism of Pfluger, 

 9; theory of break-contraction, 53. 



Negative polarisation, experiments by 

 means of Dove's disjunctor, 492. 



Nemerowsky, investigation of electro- 

 motive force of nerve-current, 97. 



Nerve-current, its interference with 

 make- and break-excitation of nerves, 

 131 ; Kiihne on contractions produced 

 by nerve-current, 141; Bering's first 

 method of observing positive after- vari- 

 ation of, 255; second and third methods, 

 259, 261 ; effect of unipolar actions on, 

 269 ; du Bois-Eeymond's investigation 

 of, criticised by Bering, 270-273. 



Obernier, addition to Pfluger's experi- 

 ments on changes of excitability, 6. 



Organ-current, definition of, 438 ; 

 investigation of, in Torpedo, 440 ; 

 present in imperfect electrical organs 

 of Skate, 445. 



Pacini, on direction of shock in electrical 

 organ, 371. 



Peltier, experiments on polarisation of 

 muscles, 51 ; on polarisation of a frog's 

 limb, 164. 



Pfluger, doctrine of electrotonus, 5 ; 

 experiments in confirmation of, by 

 Bilharz and others, 8, 10; criticism of, 

 by Munk, Hermann, Wundt, Tiger- 

 stedt, 9-15 ; his principle as to excita- 

 tion of nerve, 49 ; Tigerstedt's simpli- 

 fication of Pfluger's law of contraction, 

 65; attempt to explain influence of 

 cold on the liability of frogs to tetanic 

 excitation, 136; on Hitter's break- 

 tetanus in nerve, 319, 



Polarisability of nerve, discussed by 

 Tigerstedt, 58-64 ; of muscle, how 



modified and destroyed, 190; aff^ted 

 by tetanus, 193 ; of electrical organ, 

 affected by boiling, 214; du Bois- 

 Eeymond's views on internal positive 

 polarisability of muscle criticised by 

 Biedermann, 361. 



Polarisation, internal of nerve and 

 muscle, 77 ; Tigerstedt on, 79-90 ; ex- 

 ternal polarisation-current explains, 

 according to du Bois-Eeymond, differ- 

 ences in amount of contraction on 

 opening and closing main circuit and 

 nerve circuit, 98 ; rate of disappearance 

 of polarisation- current, 105; Hermann's 

 theory of polarisation increment criti- 

 cised by Grutzner, 121 ; internal polar- 

 isation of moist porous bodies, 165 ; 

 experiments on positive and negative 

 polarisation of muscle as depending on 

 density and duration of current, 173; 

 du Bois-Eeymond's results of experi- 

 ments on polarisation of nerves, similar 

 to those in the case of muscle, 197 ; 

 polarisation of nerve affected by boil- 

 ing, and by loss of vitality, 209 ; 

 Hermann on polarisation increment by 

 tetanus, 211; Bering's definition of 

 anodic and cathodic polarisation, 230; 

 du Bois-Eeymond's doctrine of polari- 

 sation criticised by Hermann, 278- 

 284; Hermann's experiments on polar- 

 isation after-currents, in order to eluci- 

 date facts of after-currents in nerve and 

 muscle, 312 ; polarisation after-current 

 laris- 



iug current in the intra-polar, in the same 

 direction in the extra-polar region, 319. 

 Positive polarisation, predominates in 

 muscle in the direction from the 

 equator to the two ends, 188 ; in nerve 

 probably in the direction of the physio- 

 logical innervation wave, 206 ; in 

 electrical organ in direction of shock, 

 212; dependent on the integrity of the 

 anodic spots, 244 ; du Bois-Eeymond's 

 views on positive polarisation criticised 

 by Hermann, 325 ; positive cathodic 

 polarisation in adductor muscle of 

 Anodonta, 331 ; effect on, of the mode 

 of killing muscle, 360 ; discussion of 

 homodromous absolutely positive polar- 

 isation, 497 ; dependence of positive 

 polarisation on density of polarising 

 current, 536. 



Quincke, explanation of anaphoric ac- 

 tions of current, 225. 



Hanke, on diminution of resistance of 

 muscle by boiling, 190 ; on non-effect of 

 boiling or death on resistance of nerve, 



