ON THE PERIODICITY OF THE AURORA BOREALIS. 



151 



Dec. 



4. 



5. 



7. 



8. 



8. 



9. 

 10. 

 12. 

 12. 

 13. 

 13. 

 13. 

 14. 

 14. 

 16. 

 16. 

 17. 

 17. 

 17. 

 17. 

 17. 

 17. 

 17. 

 17. 

 18. 

 18. 

 18. 

 18. 

 19. 

 19. 

 20. 

 21. 

 21. 

 21. 

 22. 

 22. 

 22. 

 23. 

 23. 

 23. 

 23. 

 23. 

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 25. 

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 25. 

 26. 



Fort Confidence. Richardson. 



Fort Confidence. Richardson. 



Fort Confidence. Richardson. 



Kingston. Lefroy. 



Fort Confidence. Richardson. 



Fort Confidence. Richardson. 



Fort Confidence. Richardson. 



Neio Fork. Hough. 



Fort Confidence. Richardson. 



Newfoundland. Lefroy. 



Aix-la-Chapelle. Heis. Jahn. 



Fort Confidence. Richardson. 



Newfoundland. Lefroy. 



Fort Confidence. Richardson. 



New Haven. Bradley. Newton and Loomis. 



Fort Confidence. Richardson. 



New Haven. Herrick. Newton and Loomis. 



Providence. Caswell. New York. Hough. 



Quebec and Kingston. Lefroy. 



Toronto and London. Lefroy. 



Fort Confidence. Richardson. 



Sturgeon. 



Dunse. Stevenson. 



Mahersloun. Broun. 



Lefroy. 



Sabine. 



Prestwich. 



Leipsic. Jahn. 



Christiania. Hansteen, 



New Haven. Herrick. Newton and Loomis, 



Toronto and London. Lefroy. 



Newfoundland and Kingston. 



Fort Confidence. Richardson. 



Quebec and London. Lefroy. 



Fort Confidence. Richardson. 



Fort Confidence. Richardson. 



Newfoundland. Lefroy. 



Fort Confidence. Richardson. 



Makerstoun. Broun. Hobarton. 



Kingston. Lefroy. 



Fort Confidence. Richardson. 



Christiania. Hansteen. 



Cambridge. Bond. Lovering. 



New Haven. Herrick. Newton and Loomis. 



Providence. Caswell. New York. Hough. 



Newberry. Johnson. 



Newfoundland and Penetanguishene. Lefroy. 



Fort Confidence. Richardson. 



Christiania. Hansteen. 



Christiania. Hansteen. 



Newfoundland. Lefroy. 



Fort Confidence. Richardson. 



Christiania. Hansteen. 



Worcester. Chandler. New York. Hough. 



Jan. 4. 

 5. 



" 7. 



" 10. 



" 11. 



" 11. 



" 11. 



" 14. 



" 14. 



" 14. 



" 14. 



" 14. 



" 14. 



" 14. 



" 14. 



" 15. 



" 15. 



" 15. 



" 15. 



" 15. 



" 16. 



" 16. 



" 17. 



" 17. 



" 19. 



" 20. 



" 20. 



" 22. 



" 22. 



" 23. 



" 23. 



" 24. 



" 25. 



" 25. 



1849. 



England. Hough. Fort Con/? ofence.Richardson. 



Makerstoun. Broun. 



Newfoundland and Quebec. Lefroy. 



Fort Confidence. Richardson. 



Quebec. Lefroy. 



Fort Confidence. Richardson. 



Christiania. Hansteen. 



Providence, R. I. Caswell. 



New Haven? Bradley. Newton and Loomis. 



New York. Hough. Newberry. Johnson. 



Kingston, Toronto, and Halifax. Lefroy. 



Newfoundland and Quebec. Lefroy. 



Fort Confidence. Richardson. 



Prestwich. Sturgeon. Christiania. Hansteen. 



Makerstoun. Broun. Paris. Hough. 



New Haven. Herrick. Newton and Loomis. 



New York. Hough. 



Fort Confidence. Richardson. 



Christiania. Hansteen. 



Makerstoun. Broun. 



Makerstoun. Broun. 



Fort Confidence. Richardson. 



Penetanguishene. Lefroy. 



Fort Confidence. Lefroy. 



Fort Confidence. Richardson. 



Christiania. Hansteen. 



Fort Confidence. Richardson. 



New York. Hough. Toronto. Lefroy. 



Fort Confidence. Richardson. 



Newfoundland. Lefroy. 



Fort Confidence. Richardson. 



Fort Confidence. Richardson. 



Newfoundland. Lefroy. 



Makerstoun. Broun. 



