CONTENTS. Xi 



CHAPTER X. 



PAGE 



1. Diverting arches; 2. Current-curves and tension-curves; 

 3. Diverting cylinders ; 4. Method of measuring tension 

 differences by compensation 17G 



CHAPTER XL 



1. A regular muscle-prism; 2. Currents and tensions in a 

 muscle-prism ; 3. Muscle-rhombus ; 4. Irregular muscle- 

 rhombi ; 5. Current of m. gastrocnemius .... 189 



CHAPTER XII. 



1. Negative variation of the muscle-current ; 2. Living muscle 

 is alone electrically active ; 3. Parelectronomy ; 4. Secon- 

 dary pulsation and secondary tetanus ; 5. Glands and their 

 currents . 202 



CHAPTER XIII. 



1. The nerve-current ; 2. Negative variation of the nerve- 

 current ; 3. Duplex transmission in the nerve ; 4. Eate of 

 propagation of negative variation ; 5. Electrotonus ; 6. 

 Electric tissue of electric fishes ; 7. Electric action in plants 21 o 



CHAPTER XIV. 



1. General summary; 2. Fundamental principles; 3. Com- 

 parison of muscle-prism and magnet; 4. Explanation of 

 the tensions in muscle-prisms and muscle-rhombi ; 5. 

 Explanation of negative variation and parelectronomy ; 6. 

 Application to nerves ; 7. Application to electric organs 

 and glands 226 



CHAPTER XV. 



1. Connection of nerve and muscle ; 2. Isolated excitement of 

 individual muscle-fibres j 3. Discharge-hypothesis ; 4. Prin- 



