CONTENTS 



CHAPTEE I 



THE MECHANICAL RESPONSE OF LIVING SUBSTANCES 



PAGE 



Mechanical response Different kinds of stimuli Myograph Charac- 

 teristics of response-curve : period, amplitude, form Modification 

 of response-curves ......... 1 



CHAPTEE II 



ELECTEIC RESPONSE 



Conditions for obtaining electric response Method of injury Current 

 of injury Injured end, cuproid : uninjured, zincoid Current of 

 response in nerve from more excited to less excited Difficulties 

 of present nomenclature Electric recorder Two types of response, 

 positive, and negative Universal applicability of electric mode of 

 response Electric response a measure of physiological activity 

 Electric response in plants 



CHAPTEE III 



ELECTRIC RESPONSE IN PLANTS METHOD OF NEGATIVE 

 VARIATION 



Negative variation Response recorder Photographic recorder 

 Compensator Means of graduating intensity of stimulus Spring- 

 tapper and torsional vibrator Intensity of stimulus dependent 

 on amplitude of vibration Effectiveness of stimulus dependent on 

 rapidity also . 17 



