CONTENTS 



CHAPTER I 



THE MOLECULAR RESPONSIVENESS OF MATTER 



PAGE 



se to stimulus by change of form Permeability variation Variation 

 of solubility Method of resistivity variation : (a) positive variation; (b) 

 negative variation Sign of response changed under different molecular 

 modifications Response of vegetable tissue by variation of electrical 

 resistance Response by electro-motive variation in inorganic substances 

 The method of block Positive and negative responses Similar 

 responses in living tissues Effects of fatigue, stimulants, and poisons on 

 inorganic and organic responses Method of relative depression, or 

 negative variation, so called ........ I 



CHAPTER II 



THE ELECTRO-MOTIVE RESPONSE OF PLANTS TO DIFFERENT 

 FORMS OF STIMULATION 



Historical Difficulties of investigation Electrical response of pulvinus of 

 Mimosa Simultaneous mechanical and electrical records Division of 

 plants into 'ordinary' and 'sensitive' arbitrary Mechanical and 

 electrical response of ' ordinary ' plants Direct and transmitted stimu- 

 lationAll forms of stimulus induce excitatory change of galvanometric 

 negativity . . . . . .12 



CHAPTER III 



THE APPLICATION OF QUANTITATIVE STIMULUS AND K ELATION 

 BETWEEN STIMULUS AND RESPONSE 



nditions of obtaining uniform response Torsional vibration as a form of 

 stimulus Method of block Effective intensity of stimulus dependent 

 on period of vibration Additive action of feeble stimuli Response 



