ON THE MAGNETIC DISTURBANCES. 495 



versa. (There is about six hours" difference in the ab- 

 solute time corresponding to the same solar hours at the 

 two stations.) The great disproportion also in the mag- 

 nitude of the disturbances at Toronto and Point Barrow 

 is most conclusive evidence of the greater energy of 

 the disturbing forces at some parts of the globe than at 

 others ; and leads to the natural inference that at Point 

 Barrow we are in close proximity to one of the so.urces 

 from which their actions emanate. 



The extraordinary manifestation of concomitant au- 

 roral phenomena, and the insight which we have gained 

 thereby into the horary laws of their occurrence, and 

 into the relation of these laws to those of one in parti- 

 cular of the disturbance variations, unite in indicating 

 the neighbourhood of Point Barrow as one of the most 

 important localities on the globe for the further prose- 

 cution of these researches. 



