120 



ON THE PERIODICITY OF THE AURORA BOREALIS. 



Sept.27. Christiania. Hansteen. 



" 28. Christiania. Hansteen. 



" 29. Southampton. Longhland. Herrick. N. and L. 



« 30. New York. Hough. 



Oct. 5. Christiania. Hansteen. 



" 5. Kaafiord, Finmark. Thomas. 1 



" 6. New Haven. Herrick. Newton and Lootnis. 



" 6. New York. Hough. 



" 6. St. Petersburg. Kupffer. Huggate. Rankin. 2 



" 6. Kaafiord. Thomas. 



" 8. Kaafiord. Thomas. 



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



" 18. Paris. Mandl. Dunse. Stevenson. 



" 18. St. Petersburg and Zlaloouste. Kupffer. 



" 18. Stockholm. Hough. YakoiUsk. Kupffer. 



" 18. Arago and Quetelet. 



" 19. Christiania. Hansteen. 



" 19. Kaafiord. Thomas. 



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



" 21. Kaafiord. Thomas. 



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



"■ 22. Neic York. Hough. Providence. Caswell. 



" 23. Christiania. Hansteen. 



" 25. Christiania. Hansteen. 



" 26. Kaafiord. Thomas. 



" 30. Kaafiord. Thomas. 



Nov. 1. New Haven. Herrick. Newton and Loomis. 



« 1. Kaafiord. Thomas. 



" 4. New York. Hough. 



" 5. Norfolk, Conn. Herrick. Newton and Loomis. 



" 5. New York. Hough. 



" 5. Kaafiord. Thomas. 



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



" 12. New York. Hough. Ashurst. Snow. 



" 12. Brussels. Quetelet. Dunse. Stevenson. 



" 12. France and Italy. Arago. 



" 13. New York. Hough. 



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



" 14. New York. Hough. 



" 14. South Carolina and Georgia. Hough. 



" 14. G. Britain. Hough. Yakoutsk. Kupffer. 



" 14. Christiania. Hansteen. Kaafiord. Thomas. 



" 15. Yakoutsk. Kupffer. Kaafiord. Thomas. 



" 15. Christiania. Hansteen. 



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



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



i Observ. Magnet. Comm. Nord. 



2 Proc. Brit. Assoc. XV. 15. 



8 Amer. Journ. Sci. XXXIV. 267. 



Dec, 



Nov. 18. 

 " 19. 

 " 20. 

 " 21. 

 " 23. 

 " 24. 

 " 26. 

 " 30. 

 " 30. 

 1. 

 1. 

 1. 

 2. 

 2. 

 2. 

 3. 

 4. 

 5. 

 11. 

 12. 

 19. 

 19. 

 28. 

 30. 



Jan. 



3. 



4. 



5. 



5. 



9. 

 11. 

 13. 

 15. 

 15. 

 16. 

 16. 

 16. 

 16. 

 17. 

 18. 

 19. 

 20. 

 21. 

 22. 

 24. 

 24. 

 25. 



Yakoutsk. Kupffer. Kaafiord. Thomas. 

 Kaafiord. Thomas. 

 Kaafiord. Thomas. 

 Kaafiord. Thomas. 

 Kaafiord. Thomas. 

 Kaafiord. Thomas. 

 Kaafiord. Thomas. 



New Haven. Herrick. Newton and Loomis. 

 Kaafiord. Thomas. 

 Boston. Hale. Lovering. 

 New Haven. Herrick. Newton and Loomis. 

 New York. Hough. Providence. Caswell. 

 Catharinebourg. 1 Kupffer. 

 < 'hrisliania. Hansteen. 

 Kaafiord. Thomas. Quetelet. 

 Kaafiord. Thomas. 

 Boston. Hale. Lovering. 

 Neio Haven. Herrick. Newton and Loomis. 

 Kaafiord. Thomas. 

 Copenhagen. Hough. 

 ( 'hrisliania. Hansteen. 

 Yakoutsk. Kupffer. 



New Haven. Herrick. Newfon and Loomis. 

 New Haven. Herrick. Newton and Loomis. 



1838. 



Kaafiord. Thoma>. 



Kaafiord. Thomas. 



New Haven. Herrick. Newton and Loomis. 



New York. Hough. Kaafiord. Thomas. 



Kaafiord. Thomas. 



Kaafiord. Thomas. 



Kaafiord. Thomas. 



New Haven. Herrick. Newton and Loomis. 



New York. Hough.* Kaafiord. Thomas. 



New Haven. Herrick. Newton and Loomis. 



St. Petersburg and Yakoutsk. 1 Kupffer. 



Catharinebourg. Kupffer. 



Kaafiord. Thomas. Zlaloouste} Kupffer. 



Yakoutsk. 



Kaafiord. 

 New York. 

 Kaafiord. 

 Kaafiord. 

 Kaafiord. 



Kupffer. 

 Thomas. 

 Hough. 

 Thomas. 

 Thomas. 

 Thomas. 



Kaafiord. 

 Kaafiord. 



Thomas. 



Thomas. 



New Haven. Herrick. Newton and Loomis. 

 New York. Hough. 

 New York. Hough. 



1 Annuaire Magnet, et Meter, de Russie. 



