"The Aurora Borealis and Australis (Aurora)... take place at the very centres of terrestrial electric and magnetic forces. The two Poles are said to be the store-houses, the receptacles and liberators, at the same time, of cosmic and terrestrial Vitality (Electricity), from the surplus of which the Earth, had it not been for these two natural safety-valves, would have been rent to pieces long ago. p. 226"