ON THE PERIODICITY OF THE AURORA BOREALIS. 



103 



1 Journ. of a Second Voyage, &c. p. 39. 



2 Edin. Phil. Joarn. VI. 175. Gilbert. Ann. LXXV. 68. 

 8 Journ. of a Second Voyage, Appendix, p. 266. 



1824. 



Jan. 21. Leith. Coldstream. Arago. 

 July 29. Hudson's Bag. Lyon. 6 Arago. 



1 In 1822, the aurora was frequently observed by Franklin, at 

 Moose-Deer Island, Lat. 61° N. and Long. 114° W., but it was not 

 brilliant. Franklin. Narrative of a Journey, &e. p. 553. 



2 Edin. Journ. Sci. VI. 380. 



8 Journ. of a Second Voyage, &c. p. 381 . 



4 Parry says : " Another peculiarity, observed in this winter, 

 was the rare occurrence of the Aurora Borealis, and the extraordi- 

 nary poorness of its display, whenever it did make its appearance." 

 pp. 381 and 420. Von Wrangel also states, that auroras were 

 rare and less brilliant than usual during the winter of 1822-23, in 

 Lat. 70° N. and Long. 174° E. p. 318. Force, p. 87. 



5 During the dark season, I mean the time that we did not at 

 all see the sun, it was remarked with astonishment that the aurora 

 was very rarely seen, in fact only once or twice, and then so faint- 

 ly as scarcely to call our attention. Igloolik. Lat. 69° N. Long. 

 82° W. March, 1823. Lyon's Private Journal, p. 306. Force, p 

 83. 



Private Journal, &c. 



