352 TRANSACTIONS OF THE CANADIAN INSTITUTE. [VoL. VI. 
1898. Mag. Hor. F. Toronto. 
January February 
a A 
| The arrows, 274 days apart, | shew the 
The lower and broken line shews the curve of frequency 
March April 
central part of the four days’ magnetic disturbance. | 
and brilliancy of aurore, tn Canada (inverted ) 
January, 1898, was a very quiet month, but any one accustomed to 
inspect such curves would not let pass without notice the depression on 
the 5th, and especially the double dip on the 18th and 2oth, for these 
pulls in pairs often develop into severe storms, which frequently preserve 
their two-headed character. 
The dip of January 5th did not show in February, but reappeared 
on March 2nd and 29th, where we will leave it for future reference. 
The double dip of the 18th and 20th January was connected with a de- 
pression beginning on the 14th, and at the next solar rotation, on the 1oth 
of February, a return of the depression was observable, and a huge sun- 
spot coming into full view at the same time, a magnetic storm might 
reasonably be expected. It did occur, and lasted several days. The 
eruption must have involved a large solar area, for the spot developed 
thereby covered a third of the disc, in breadth, and therefore took four 
days and a half to pass any given point. It may be seen that the 
occurrence developed no magnetic energy on coming into view around 
the eastern limb. . 
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