74. The courses of electricity. 



a. Friction. 



Experiment 59. Frictional electricity. 



b. Chemical. 



Experiment 60. Electric batteries. 



c. Magnetic. 



Experiment 61. Electricity from mag- 

 netism. 



75. Chemical effects of electricity. 



a. Electrolysis. 



Experiment 62. Electrolysis of water. 



b. Electroplating and electrotyping. 



Experiment 63. How to electroplate and 

 electrotype. 



76. The storage cell. 



Experiment 64. How to make a storage 

 cell. 



77. The induction coil. 



Experiment 65. How to make an in- 

 duction coil. 



Experiment 66. Experiments with an in- 

 duction coil. 



78. Wireless telegraphy. 



a. Theory. 



Experiment 67. Wireless telegraphy 

 across a room. 



b. Practice. 



79. Other applications of electricity. 



Experiment 68. Practical work in elcc- 

 tricitv. 



