138 FROM NEBULA TO NEBULA 



missible drain on inertial momentum; bnt the explana- 

 tion becomes fully available under my own theory of 

 gravitational centrifugal motions. 



According to this logic, the earth's poles, being the 

 termini of the supposed ''core/' should be* the centers 

 of greatest electrical activity, the rharge passing from 

 one or the other of them through the atmosphere, along 

 meridional lines, to the opposite pole, thereby com- 

 pleting the circuit. This surmise accounts at once, and 

 equally well, both for the northern lights, or aurora 

 borealis, and for the direction and deflection of the 

 needle; besides offering a most alluring field for specu- 

 lation as to the possible future exploitation of another 

 natural resource. 



