Observations of the Aurora Borealis, 1850-51. 



65 



Table III. — Observations arranged according to position of Sta- 

 tion with reference to the Magnetic Pole. The figures under 

 the heading Proportion shows the per-centage of observation 

 of Aurora, to nights on which observation appears to have been 

 possible, as regards the state of the sky. 



(a) Down to the 19th May. There is no night, properly speaking, at Fort 

 Simpson in May ; that is to say, twilight lasts from sunset to sunrise, {b) Re- 

 gister at Moose Factory begins on the 17th of June, (c) including Jlr. Anderson's 

 observations en route, (d) No observations made at Micliipicoton from the 21st 

 of August to the 20th of September, hut probably no conspicuous aurora occurred, 

 (e) Four stations up to the 10th, from 11th to the end, only two. (/) Register 

 from the 2nd to the 18th of September. 



In the third circle (c) or stations from 1600 to 2000 miles from the magnetic 

 pole. 



Phil. Mag. S. 4. Vol. 3. No. 22. July 1852. 



