132 



ON THE PERIODICITY OF THE AURORA BOREALIS. 



Feb. 



Mar. 



6. 



6. 



7. 



8. 



9. 

 10. 

 11. 

 11. 

 11. 

 12. 

 13. 

 14. 

 16. 

 17. 

 18. 

 18. 

 19. 

 24. 

 24. 

 24. 

 24. 

 26. 

 27. 

 28. 



1. 



2. 



3. 



3. 



4. 



5. 



6. 



7. 

 10. 

 11. 

 12. 

 15. 

 16. 

 17. 

 19. 

 20. 

 23. 

 27. 

 28. 

 29. 

 30. 



1. 



Worcester. "Woodward. 

 Newton and Looniis. 



Golhaab. Block. 



Neio Haven ? Herrick. Newton and Loomis. 1 



Washington, D. C. Gilliss. 



Gothaab. Block. 



Christiania. Hansteen. Golhaab. Block. 



Gothaab. Block. 



Gothaab. Block. 



Cambridge. Lovering. 



New Haven. Herrick. 



Dunse. Stevenson. 



New York. Hough. 



New York. Hough. 



Christiania. Hansteen. Gothaab. Block. 



Christiania. Hansteen. Gothaab. Block. 



Gothaab. Block. 



Christiania. Hansteen. Hobarton. Sabine. 



Gothaab. Block. 



Gothaab. Block. 



Worcester, Mass. "Woodward. 



Christiania. Hansteen. Gothaab. Block. 



St. Petersburg. Kupffer. 2 



Alford. Farquharson. 3 



Gothaab. Block. 



Gothaab. Block. 



Gothaab. Block. 



Christiania. Hansteen. 



Gothaab. Block. 



Sitka. Kupffer. Gothaab. Block. 



St. Petersburg. Kupffer. 



Gothaab. Block. 



Christiania. Hansteen. Gothaab. Block. 



Sitka. Kupffer. 



New Haven ? Herrick. Newton and Loomis. 



Toronto. Sabine. 



Toronto. Sabine. 



New York. Hough. 



St. Petersburg. Kupffer. 



Christiania. Hansteen. 



Gothaab. Block. 



Sitka. Kupffer. 



New York. Hough. 



Cambridge. Bond. 



Gothaab. Block. 



Gothaab. Block. 



Christiania. Hansteen. 



Christiania. Hansteen. 



Christiania. Hansteen. 



Sitka. Kupffer. 

 Lovering. 



Apr 



1 Bull, de 1' Acad. Brux. IX. Pt. II. p. 145. 



2 Annuare. Magnet, et Meteor, de Rnssie. 1842, p. 41. 



8 Phil. Trans. 1S42, p. 87. Edin. New Phil. Journ. XXXVIII. 

 135. 



Apr. 3. St. Petersburg. Kupffer. Gothaab. Block. 



" 3. Christiania. Hansteen. 



" 4. Gothaab. Block. 



" 5. New York. Hough. Christiania. Hansteen. 



" 6. Gothaab. Block. 



" 7. Christiania. Hansteen. Gothaab. Block. 



" 8. Christiania. Hansteen. Gothaab. Block. 



" 9. Christiania. Hansteen. Gothaab. Block. 



" 10. Cambridge. Bond. Lovering. 



" 10. Worcester, Mass. "Woodward. 



" 10. Neta Haven. Herrick. Newton and Loomis. 



" 10. Neio York. Hough. Christiania. Hansteen. 



" 10. Gothaab. Block. 



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



" 11. New York. Hough. Toronto. Sabine. 



" 11. Christiania. Hansteen. Sitka. Kupffer. 



" 11. Hobarton,V.D.Land. Sabine. 1 Gothaab. Block. 



" 12. Cambridge. Bond. Lovering. 



" 12. New York. Hough. Christiania. Hansteen. 



" 13. Worcester, Mass. Woodward. 



" 13. Christiania. Hansteen. Hobarton. 1 Sabine. 



" 14. Worcester. Woodward. Washington. Gilliss. 



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



" 14. New York. Hough. Toronto. Sabine. 2 



" 14. Christiania. Hansteen. Hobarton. Sabine. 1 



" 15. New York. Hough. Toronto. Sabine. 



" 15. Philadelphia. Bache. 



" 15. Christiania. Hansteen. Hobarton. Sabine. 



" 15. St. Petersburg. Kupffer. 



" 16. Worcester, Mass. Woodward. 



" 16. Christiania. Hansteen. Toronto. Sabine. 



" 20. New Haven. Herrick. Newton and Loomis. 8 



" 26. Gothaab. Block. 



" 29. Christiania. Hansteen. 



May 16. Hobarton, Van Dieman's Land. Sabine. 1 



June 2. New York. Hough. 



" 4. New York. Hough. Toronto. Sabine. 



" 7. Worcester, Mass. Woodward. 



" 9. Worcester, Mass. "Woodward. 



" 13. New York. Hough. Hobarton. Sabine. 



" 30. Brussels. Quetelet. 



" 31 ? Brussels.* 



July 2. New York. Hough. Hobarton. Sabine. 



" 3. Cambridge. Bond. Lovering. 



" 3. New York. Hough. Toronto. Sabine. 



1 Aurora Australia. 



2 Magnet, and Meteor. Observ. Toronto, II. 172. 

 8 Amer. Journ. Sci. XLIII. 213. 



* Bull, de l'Acad. Brux. IX. Pt. II. p. 6. 



