CONTENTS 



LECTURE I 



PAOJ 



Aim and Purpose of the Lectures The Subject-matter of Physiology 

 -The Signs of Life ; The Sign of a Sign is a Sign of the Thing 

 itself Two Familiar Instances ; on Muscle and on Nerve A 

 Proof of Chemical Change in Seeds An Experiment on Muscle 

 Retinal Currents Vegetable Currents Terminology Solu- 

 tion-pressure Summary ...... i 



LECTURE II 



The Prospect Demonstration of Retinal Currents The Initial 

 Current The Principal Fact ; Subordinate Features Three 

 Types of Response Two Opposed Processes Effects of Com- 

 plementary Colours Cause : Effect Anaesthetics Retino-motor 

 Effects 21 



LECTURE III 



Plan of this Lecture Electrical Excitation of a Frog's Eyeball- 

 Modification of the Response to Light subsequent to Tetanisa- 

 tion, and during Tetanisation Effects and After-effects of Single 

 Shocks " Blaze-currents "- - Polarisation Currents Electrocu- 

 tion -Three Types of Blaze-currents The Effect is greater than 

 its Cause Influence of a Galvanic Current Some Questions 

 The Crystalline Lens . . . . . 41 



LECTURE IV 



Skin-currents (of the Frog) The Normal Current is " Ingoing"- -The 

 Response to Indirect Excitation is Outgoing, Mixed, or Ingoing 

 The Latent Period is Two Seconds Fatigue Atropine 

 Mercuric Chloride The Response to Direct Excitation is Out- 

 going Summation Effects of Tetanisation Localisation of the 

 Response by the ABC Method Terminology . . -59 



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