CONTENTS XV 



CHAPTER VII 



ABSORPTION AND EMISSION OF ENERGY IN RESPONSE 



PAGE 



Sign of response determined by latent energy of tissue, and by intensity of 

 external stimulus Sub-tonic, normal and hyper-tonic conditions The 

 critical level Outward manifestation of response possible only when 

 critical level is exceeded Three typical cases : response greater than 

 stimulus ; response equal to stimulus ; and response less than stimulus 

 Investigation by growth-response The sum of work, internal and 

 external, performed by stimulus constant Positive response of tissues 

 characterised by feeble protoplasmic activity or sub-tonicity Enhance- 

 ment of normal excitability of sub-tonic tissue by absorption of stimulus 76 



CHAPTER VIII 



VARIOUS TYPES OF RESPONSE 



Chemical theory of response Insufficiency of the theory of assimilation and 

 dissimilation Similar responsive effects seen in inorganic matter 

 Modifying influence of molecular condition on response Five molecular 

 stages, A, B, c, D, E Staircase effect, uniform response, fatigue No 

 sharp line of demarcation between physical and chemical phenomena 

 Volta-chemical effect and by-productions Phasic alternation Alter- 

 nating fatigue Rapid fatigue under continuous stimulation In sub- 

 tonic tissue summated effect of latent components raises tonicity and 

 excitability Response not always disproportionately greater than 

 stimulus Instances of stimulus partially held latent : staircase and 

 additive effects, multiple response, renewed growth .... 86 



CHAPTER IX 



DETECTION OF PHYSIOLOGICAL ANISOTROPY BY ELECTRIC 

 RESPONSE 



Anomalies in mechanical and electrical response Resultant response deter- 

 mined by differential excitability Responsive current from the more to 

 the less excitable Laws of response in anisotropic organ Demonstra- 

 tion by means of mechanical stimulation Vibrational stimulus Stimu- 

 lation by pressure Quantitative stimulation by thermal shocks . . 107 



CHAPTER X 



THE NATURAL CURRENT AND ITS VARIATIONS 



Natural current in anisotropic organ from the less to the more excitable 

 External stimulus induces responsive current in opposite direction 

 Increase of internal energy induces positive, and decrease negative, 



