CONTENTS XX111 



CHAPTER XXXI 



ON A NEW METHOD FOR THE QUANTITATIVE STIMULATION 

 OF NERVE 



PAGE 



Drawbacks to use of electrical stimulus in recording electrical response 

 Response to equi-alternating electrical shocks Modification of response 

 by decline of injury Positive after-effect Stimulation of nerve by 

 thermal shocks Enhancement of normal response after tetanisation 

 Untenability of theory of evolution of carbonic acid Abnormal positive 

 response converted into normal negative after tetanisation Gradual 

 transition from positive to negative, through intermediate diphasic 

 Effect of depression of tonicity on excitability and conductivity Con- 

 version of abnormal into normal response by increase of stimulus-intensity 

 Cyclic variation of response under molecular modification . . . 456 



CHAPTER XXXII 



ELECTRICAL RESPONSE OF ISOLATED VEGETAL NERVE 



Specialised conducting tissues Isolated vegetal nerve Method of ob- 

 taining electrical response in vegetal nerve Similarity of responses of 

 plant and animal nerve : (a) action of ether (b) action of carbonic 

 acid (c) action of vapour of alcohol (d] action of ammonia (e) ex- 

 hibition of three types of response, negative, diphasic and positive 

 (/) effects of tetanisation of normal and modified specimens Effect of 

 increasing stimulus on response of modified tissue .... 468 



CHAPTER XXXIII 



THE CONDUCTIVITY BALANCE 



Receptivity, conductivity, and responsivity Necessity for distinguishing 

 these Ad vantages of the Method of Balance Simultaneous comparison of 

 variations of receptivity, conductivity and responsivity The Conductivity 

 Balance Effect of Na 2 CO 3 on frog's nerve Effect of CuSO 4 Effect 

 of chemical reagents on plant nerve Effect of CaCl 2 on responsivity 

 Responsivity variation under KC1 Comparison of simultaneous effects 

 of NaCl and NaBr on responsivity Effects of Na 2 CO 3 in different 

 dilutions on conductivity Demonstration of two different elements in 

 conductivity, velocity and intensity Conductivity versus responsivity 

 (a) effect of KI (b) Effect of Nal Effect of alcohol on receptivity, 

 conductivity, and responsivity Comparison of simultaneous effects of 

 alcohol (a) on receptivity versus conductivity- (b) on receptivity versus 

 responsivity. . . , . . . . , s . . . 479 



