Auroras in the Easiern Ilenmphere. 233 



trial magiietisiii and utterly inseparable from it, still it is out of our power to 

 discern the links which chain them together. Theory after tlieory has been i)ro- 

 X)Osed, but none is adequate; the obscurity which lowers over this indescribable 

 phenomenon is as intense to-day as a hundred years ago. ("New Lauds within 

 the Arctic Circle.") 



