ON THE PERIODICITY OF THE AURORA BOREALIS. 



155 



Sept.19. Halifax and Fenelon Falls. Lefroy. 



" 19. Fort Macpherson. Hooper. 



" 19. Makerstoun. Broun. 



" 20. New York. Hough. 



" 21. Halifax. Lefroy. 



" 23. New York. Hough. Christiania. Hansteen. 



" 24. Kingston and Toronto. Lefroy. 



" 24. Christiania. Hansteen. 



" 25. Jakobshavn. Rudolph. 



" 27. Newberry. Johnson. Schmidt. 



" 27. Fort Good Hope. Hooper. 



" 27. Jakobshavn. Rudolph. 



" 29. Montreal and Kingston. Lefroy. 



" 29. Newfoundland and Quebec. Lefroy. 



" 29. Dunse. Stevenson. 



Oct. 1. New York. Hough. England. Hough. 



" 4. New York. Hough. 



" 7. Montreal and Kingston. Lefroy. 



" 7. Toronto and London. Lefroy. 



" 7. Newfoundland and Quebec. Lefroy. 



" 9. Montreal. Lefroy. 



" 10. Toronto. Lefroy. Christiania. Hansteen. 



" 13. New York. Hough. Providence. Caswell. 



" 13. New Haven ? Herrick. Newton and Loomis. 



" 13. Newberry. Johnson. Quebec. Lefroy. 



" 13. Kingston, Toronto, and London. Lefroy. 



" 14. New Haven. Herrick. Newton and Loomis. 



" 14. Newberry. Johnson. Providence. Caswell. 



" 14. New York. Hough. 



" 14. Quebec, Montreal, and Toronto. Lefroy. 



" 14. Halifax and London, C. W. Lefroy. 



" 14. Christiania. Hansteen. Makerstoun. Broun. 



" 15. Newberry. Johnson. Cambridge. Glaisher. 1 



" 15. Christiania. Hansteen. 



" 1 6. Fort Norman. Hooper. 2 



" 17. Newfoundland and Kingston. Lefroy. 



" 17. Christiania. Hansteen. 



" 18. New York. Hough. Newberry. Johnson. 



" 18. Kingston and Toronto. Lefroy. 



" 18. Halifax and London, C. W. Lefroy. 



" 18. Makerstoun. Broun. 



" 19. New York. Hough. 



" 19. Halifax and Kingston. Lefroy. 



" 20. New York. Hough. Kingston. Lefroy. 



" 21. Newfoundland. Lefroy. 



" 22. Aix-la-Chapelle. Heis. Jahn. 



" 22. Leipsic. Jahn. Schmidt. 



i Phil. Mag. Third Series, XXXVI. p. 

 - Journal of Proceedings, &e. 156. 



116. 



Fort Norman. Hooper. Jakobshavti. Rudolph. 

 Greenwich, Engl. 1 Christiania. Hansteen. 

 New York. Hough. Fort Norman. Hooper. 



Christiania. Hansteen. Schmidt. 



Montreal and Toronto. Lefroy. 



Dunse. Stevenson. Brussels. Quetelet. 



Schmidt. Jakobshavn. Rudolph. 



New York. Hough. Fort Norman. Hooper. 



Fort Norman. Hooper. 



Fort Norman. Hooper. 



New York. Hough. 



Toronto ? and London. Lefroy. 



Newfoundland and Quebec. Lefroy. 



Fort Norman. Hooper. 



Fort Norman. Hooper. 



Senftenberg. 2 Schmidt. 



Jakobshavn. Rudolph. 



Brussels. Quetelet. 



Newfoundland. Lefroy. 



New Haven. Herrick. Newton and Loomis. 



Toronto and Kingston. Lefroy. 



Fort Norman. Hooper. 



Toronto. Lefroy. Fort Norman. 



Kingston and Toronto. Lefroy. 



Christiania. Hansteen. Jakobshavn. 



New York. Hough. Fenelon Falls. 



Jakobshavn. Rudolph. 



Kingston and Toronto. Lefroy. 



Toronto ? Lefroy. Christiania. Hansteen. 



Dunse. Stevenson. Schmidt. 



Fort Franklin. Hooper. 



Christiania. Hansteen. 



Toronto. Lefroy. Fort Franklin. Hooper. 



Toronto ? Lefroy. 



Quebec and Toronto. Lefroy. Sitka. Kupffer. 



Providence. Caswell. Kingston. Lefroy. 



Christiania. Hansteen. Sitka. Kupffer. 



Newberry. Johnson. 



Montreal and Toronto. Lefroy. 



Neufoundland and Quebec. Lefroy. 



Jakobshavn. Rudolph. 



Fort Franklin. Hooper. 



Fort Franklin. Hooper. 



New Haven ? Herrick. Newton and Loomis. 



New York. Hough. Fort Franklin. Hooper. 



Jakobshavn. Rudolph. 



New York. Hough. Fort Franklin. Hooper. 



t Phil. Mag. Third Scries, XXXVI. 116. 

 - Kreil's Jalirbuch fur Prag. I. 415. 



Hooper. 



Rudolph. 



Lefroy. 



