RECORD OF AURORAL PHENOMENA. 109 



18th. At twelve p. m., an arched Aurora, centre N. N. E., about 20° high, 6° broad, extending 



from N. W. to E. 

 19th. At eight p. m., an appearance of Aurora in the northern horizon. 

 N. B. — From March 22 to April the 8th, the descriptions of the Aurora? and other observations 



relative to their height, have been delivered in a separate paper. 

 April 10th and 12th. Appearance of Aurora north. 

 14th. At nine p. m., an arched Aurora, about 15° high; centre north. 

 15th. An arched Aurora, 16° high, centre N. by E. 

 16th. Appearance of Aurora N. N. E. 

 1 9th. At ten p. m., an arched Aurora 25° high, centre N. by E., extending from N. E. to N. N. W. 



At eleven p. m., it was 35° high, and its eastern extremity turned back upon itself, and appeared 



to dart a flash perpendicularly towards the earth. At llh. 30m. p. m., several flashes reached 



the zenith. Color as usual. 

 20th. Appearance of Aurora through a thick fog. 



27th. At twelve p. m., a segment of an arch, and several flashes, north, and about 30° high. 

 29th. Several flashes of Aurora bearing north. 

 30th. At eight p. m., an arched Aurora 30° high ; centre bearing N. N. E., extremities N. E. by E. 



and N. W. by N. 

 May 1st. A twelve p. m., a remarkable Aurora rose from E. N. E. like the trunk of a tree, and 



spread forth branches all over the sky, but principally towards the south. They were composed 



of beams, which always are distinguishable when the Aurora is much agitated. Ordinary 



color; many scattered flashes round the horizon. 

 2d. At eleven p. m., an arch across the zenith, 6° broad, and faint ; extremes E. by S. and W. by N. 

 3d. At ten p. m., an Aurora in rapid motion, seen through the clouds. 

 5th. At eleven p. m., an arched Aurora, very faint ; centre N. N. E. 

 12th. At twelve p. m., the northern half of the sky was filled with a light attenuated Aurora, not 



more brilliant than the milky way ; but flashing with such rapidity that the eye could not follow 



its motion, nor determine its form. 

 12th. At eight p. m., appearance of Aurora north. 

 18. Ditto. 



23d. An arched Aurora 15° high ; centre N. by E. 

 28th. Appearance of Aurora in the northern horizon. 

 N. B. — The above descriptions were taken at the times inserted. The Aurora no doubt often 



changed its form afterwards. Many of the faint arches, however, altered only their positions in 



the course of four or five hours, by approaching nearer to the zenith." — 1 Franklin (Hood), 



543-46. 



Christian's Sound.— Lat. 60° 04' N. Long. 43° 00' W. October 26, 1828. Graah. 



" In the evening a beautiful Aurora Borealis displayed itself, in the shape of a bow stretching through 

 the zenith from east to west. It produced no perceptible effect on the magnetic needle. " — 

 Graah, p. 48. 



Nennortalik (Greenland).— Lat. 60° 08' N. Long. 45° 16' W. March 21, 1829. Graah. 

 " Between nine and eleven p. m., we had a brilliant display of the Aurora, which, particularly 

 towards the south and zenith, exhibited a succession of the most vivid colors."— Graah, p. 58. 



