ON OZONE IN RELATION TO HEALTH AND DISEASE. 31 
discharge electrical sparks through the chamber while the 
current of air is making its way. To effect this, the coating of 
tinfoil on the inner and the coating of tinfoil on the outer 
cylinder are each armed with a fine platinum wire. These 
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OP* 
wires are connected by their free ends with the poles, one wire 
to one pole, the other to the opposite pole, — of a large induction 
coil. The coil being set in action by the power derived from 
three or four cells of a Grove's battery, electrical discharges 
