CONTENTS XV 



n 



THE ELECTROMOTIVE PHENOMENA OF MUSCLE AND 

 NERVE 



Page 



THE DEMARCATION CURRENT OF MUSCLE 287 



Demarcation current of muscle Stimulation by demarca- 

 tion current Interference between demarcation current 

 and stimulating current; polar refusal. 



DEMARCATION CURRENT OF NERVE 295 



Nerve may be stimulated by its own demarcation current. 



HYPOTHESES REGARDING THE CAUSATION OF THE DE- 

 MARCATION CURRENT 297 



ACTION -CURRENT OF MUSCLE ......... 802 



Rheoscopic frog Action current in tetanus; stroboscopic 

 method Action current of human muscle Action 



current of heart. 



/ 



ACTION CURRENT OF NERVE 315 



Negative variation Positive variation Positive after 

 current Contraction secured with a weaker stimulus 

 than negative variation Current of action in optic 

 nerve Errors from unipolar stimulation. 



SECRETION CURRENT 320 



Secretion current from mucous membrane Negative vari- 

 ation of secretion current. 



ELECTROTONIC CURRENTS . 323 



Negative variation of electrotonic currents ; positive vari- 

 ation (polarization increment) of polarizing current 

 Electrotonic current as stimulus. 



ELECTRIC FISH 329 



