11 CONTENTS. 



PAGE 



Identity of voltaic and ordinary electricity with the other 

 kinds of electricity .19 



The analogies of the states called "conduction" and "insula- 

 tion," "charge" and "discharge," "current" and "tension" 20 



The connexion between chemical and electrical action . . 27 

 This connexion in the fluid parts of the circuit . . .29 

 This connexion in the metallic parts of the circuit . . .31 

 This connexion in the aerial parts of the circuit . . .33 

 The current a chemical idea 35 



The forces concerned in the current are not of greater intensity 

 than chemical forces 45 



The laws of chemical affinity are never suspended in the cur- 

 rent 49 



The transfer of matter in the current to be referred to chemical 

 changes 51 



The reason why chemical forces are intensified in the current . 54 

 Elucidation of the phenomenon called " tension" . . .55 



Electrical attractions and repulsions (?) to be referred to chemi- 

 cal changes . . . .56 



The existence of true repulsion questionable . . . .59 



The connexion between electricity and magnetism . . .61 



The rotation of a magnet around an electrical conductor . . 65 



The rotation of an electrical conductor around a magnet . . 66 



