588 



APPENDIX. 



[No. III. 



charge to have been received from an Aurora ; because the same weather, 

 preceding and following it, did not affect the needle in the day, when the 

 increased warmth of the air was more favourable to the production of 

 electricity in other quarters, and also to its passage. On the 24th of May, 

 between lOh. and 12h. p. m. the needle was attracted to the conductor, and 

 repelled 25°*. The next morning, Mr. Franklin found the needle of the 

 transit instrument (which was then in the meridian) affected 20'. The bright- 

 ness of the twilight prevented us from seeing the Aurora, and I therefore 

 discontinued my observations. 



That electricity was the cause of the motions which I have described does 

 not admit of a doubt. But whether the electricity was received from, or sum- 

 moned into action by, the Aurora, my readers will determine for themselves, 

 being in possession of the facts upon which I have myself founded my opinion. 



APPEARANCES OF THE AURORA AT FORT ENTERPRISE 



Extracted from the Journal of Lieutenant Hood, R.N. 



1821, January 10th, at 8h. p. m. an arched Aurora N.N.W. to N.N.E. At 



1 lh. p. m. a double arch, much broken, but not bright, from N.W. to S.E. 



11th. At midnight, faint Aurora from west to east. 



14th. At midnight, five arches of Aurora from N.W. to S.E. : a large 

 corona borealis. 



15th. At midnight, an arched Aurora from N.W. to S.E. ; beams very 

 bright ; colours, violet below, pea-green above. Their motion did not appear 

 to be general in any direction, but proceeding from particular points towards 

 the S.E. and N.W. at the same time : weather clear. 



21st. At midnight, a double arch ; extremities N.W. to S.E., centre S.W. 

 12° high. At lh. a. m., a large body issued from N.W. and covered the sky 

 with wreaths and flashes : colour as usual. 



22d. At 9h. p. m., faint arch from N. b. W. to E. 



23d. At 9h. p. m., a double arch, N.W. to S.E., centre S.W. 60° high. 



* The thermometer was then 20°, and at 3h. p. m. it had been 58 



