156 



ON THE PERIODICITY OF THE AURORA BOREALIS. 



Jan. 1. 



" 3. 



" 4. 



'• 8. 

 9. 



" 10. 



" 11. 



" 12. 



" 12. 



" 13. 



" 14. 



" 15. 



" 16. 



" 16. 



" 17. 



" 18. 



" 18. 



'• 18. 



" 19. 



" 19. 



" 22. 



" 25. 



" 27. 



Fort Franklin. Hooper. 



Christiania. Ilnnsteen. 



Montreal and Toronto. Lefroy. 



Fort Franklin. Hooper. 



( 'hristiania. Ilansteen. 



Newfound/and and Toronto. Lefroy. 



Fort Franklin. Hooper. 



Christiania. Ilansteen. Sitka. Kupffer. 



Fort Franklin. Hooper. 



New Haven ? Herrick. Newton and Loorais. 



New York. Hough. Fort Franklin. Hooper. 



New York. Hough. Toronto. Lefroy. 



Fort Franklin. Hooper. 



Jakobshavn. Rudolph. 



Fort Franklin. Hooper. 



Newfoundland. Lefroy. 



Fort Franklin. Hooper. 



Christiania. Hansteen. 



Christiania. Hansteen. 



Fort Franklin. Hooper. 



New York. Hough. 



Fort Franklin. Hooper. 



Fort Franklin. Hooper. 



New York. Hough. Fort Franklin. Hooper. 



1850. 



Fort Franklin. Hooper. 



Fori Franklin. Hooper. 



Fort Franklin. Hooper. 



Fort Franklin. Hooper. 



Fort Franklin. Hooper. 



Fort Franklin. Hooper. 



Fort Franklin.Hooper. Jakobshavn. Rudolph. 



Fort Franklin. Hooper. 



Christiania. Hansteen. 



Fort Franklin.H.ooper. Jakobshavn.Ruddlph. 



Fort Franklin. Hooper. 



Fort Franklin. Hooper. 



Fort Franklin. Hooper. 



Christiania. Hansteen. 



Fort Franklin. Hooper. 



New Haven. Herriek. Newton and Loomis. 



Litchfield. Hough. Fort Franklin. Hooper. 



Jakobshavn. Rudolph. 



Providence. Caswell. New York. Hough. 



Christiania. Hansteen. 



Fort Franklin. Hooper. 



Fort Franklin. Hooper. 



Fort Franklin. Hooper. 



Jan. 31. 

 Feb. 1. 



2. 

 " 3. 



3. 



4. 



6. 



6. 



7. 

 '• 10. 

 " 11. 

 « 12. 

 " 13. 

 " 13. 

 " 14. 

 » 15. 

 " 16. 

 " 17. 

 " 18. 

 " 22. 

 « 22. 

 " 22. 

 " 23. 

 " 26. 

 Mar. 1. 

 « 2. 

 " 2. 

 " 3. 

 " 3. 

 " 3. 

 " 4. 



4. 



4. 



4. 

 " 5. 



6. 

 " 7. 



8. 



9. 

 " 10. 

 " 10. 

 " 10. 

 " 11. 

 " 11. 

 " 11. 



New York. Hough. 

 Fort Franklin. Hooper. 

 Fort Franklin. Hooper. 

 New Haven. Herrick. Newton and Loomis. 

 New York. Hough. 

 New York. Hough. 



New Haven. Herrick. Newton and Loomis. 

 Yakoutsk. Kupffer. 1 

 Fort Franklin. Hooper. 

 Hammerfest, Norway. Noodt. 

 New Haven ? Herrick. Newton and Loomis. 

 New York. Hough. Fort Franklin. Hooper. 

 New York. Hough. Fort Franklin. Hooper. 

 Christiania. Hansteen. 

 Fort Franklin. Hooper. 

 Fort Franklin.Hooper. Jakobshavn. Rudolph. 

 Fort Franklin. Hooper. 

 New York. Hough. 

 Aix-la- Chapelle. Heis. 

 New Haven. Herrick. Newton and Loomis. 

 New York. Hough. Bcdtischport. Kupffer. 2 

 Christiania. Hansteen. 

 Christiania. Hansteen. 

 New York. Hough. 

 Fort Norman. Hooper. 

 Cambridge. Bond. Lovering. 

 New York. Hough. 

 Cambridge. Bond. Lovering. 

 New Haven ? Bradley. Newton and Loomis. 

 New York. Hough. Fort Norman. Hooper. 

 Bond. Lovering. 



Herrick. Newton and Loomis. 



Caswell. New York. Hough. 



Hansteen. 

 Hooper. 



Cambridge. 



New Haven. 



Providence. 



Christiania. 



Fort Norman. 



Fort Norman. Hooper. Jakobshavn. Rudolph. 



Fort Norman. Hooper. 



Fort Norman. Hooper. 



Sitka. Kupffer. 8 Jakobshavn. Rudolph. 



New Haven. Herrick. Newton and Loomis. 



New York. Hough. Fort Norman. Hooper. 



Christiania. Hansteen. 



Cambridge. Bond. Lovering. 



New York. Hough. Fort Norman. Hooper. 



Christiania. Hansteen. 



1 Annul, de l'Observ. Phys. Centrale de Russie, 1850, Suppl. 

 p. 27. 



2 Annal. de l'Observ. Phys. Centrale de Russie, 1S49, S. p. 109. 

 8 Annal de l'Observ. Phys. Centrale de Russie, 1850, p. 37ft 



