CONTENTS. XI 



CHAPTEK X. 



PAGE 



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

 3. Diverting cylinders; 4. Method of measuring tension 

 differences by compensation . . . . . .170 



CHAPTER XI. 



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

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

 rhombi ; 5. Current of m. gastrocnemiua . . . .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. Kate of 

 propagation of negative variation ; 5, Electrotonus ; 6, 

 Electric tissue of electric fishes; 7. Electric action in plants 215 



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; 3, Discharge-hypothesis; 4. Prin- 



