122 



ON THE PERIODICITY OF THE AURORA BOREALIS. 



Sept.13. 

 " 13. 

 " 14. 

 " 14. 

 " 14. 

 " 14. 

 " 15. 

 " 15. 

 " 15. 

 " 15. 

 " 15. 

 " 16. 

 " 16. 

 " 16. 

 " 16. 

 " 16. 

 " 17. 

 " 17. 

 " 17. 

 " 18. 

 " 18. 

 " 19. 

 " 20. 

 " 20. 

 " 21. 

 " 21. 

 " 23. 

 " 24. 

 « 24. 

 " 26. 

 " 28. 

 " 29. 

 " 30. 

 1. 

 7. 



11. 



12. 



13. 



14. 



15. 



16. 



16. 



16. 



17. 



17. 



18. 



20. 



20. 



Oct 



New York. Hough. Paris. Bouvard. 1 

 Bossekop. Lottin. Ashurst. Snow. 

 New Haven. Herrick. Newton and Loomis. 

 Bichmond, Kentucky. Herrick. N. and L. 

 Newberry. Johnson. Providence. Caswell 

 New York. Hough. 



New Haven. Herrick. Newton and Loomis. 

 Newberry. Johnson. Neie York. Hough. 

 Washington, D. C. Gilliss. 2 

 Christiania. Hansteen. Paris. Bouvard. 

 Kaafiord. Thomas. Bossekop. Lottin. 

 Boston. Hale. Lovering. 

 New Haven. Herrick. Newton and Loomis. 

 New York. Hough. Washington. Gilliss. 

 Christiania. Hansteen. Newberry. Johnson. 

 Kaafiord. Thomas. Bossekop. Lottin. 

 New Haven. Herrick. Newton and Loomis. 

 New York. Hough. Washington. Gilliss. 

 Kaafiord. Thomas. Bossekop. Lottin. 

 New York. Hough. Bossekop 

 Catharinebourg. Kupffer. 

 New York. Hough. Bossekop. 

 Providence, B. I. Caswell. 

 New York. Hough. Bossekop. 

 Catharinebourg. Kupffer. 

 Bossekop. Lottin. 

 Bossekop. Lottin. 

 Christiania. Hansteen. 

 Kaafiord. Thomas. Bossekop. 

 Christiania. Hansteen. Bossekop. Lottin. 

 Kaafiord. Thomas. Bossekop. Lottin. 



Lottin. 



Thomas. Bossekop. 



Lottin. 

 Hansteen. 



Kupffer. Bossekop. 



Lottin. 

 Hansteen. 



Oct. 22. 



" 23. 



" 24. 



" 25. 



" 27. 



" 28. 



" 30. 



" 31. 

 Nov. 1. 



" 2. 



Lottin. 



Lottin. 



Lottin. 



Bossekop. 



Kaafiord. 



Bossekop. 



Christiania. 



Barnaoid. 



Bossekop. 



Christiania. 



Lottin. 



Lottin. 



Lottin. 



Bossekop. Lottin. 



Bossekop. Lottin. 



New Haven. Herrick. Newton and Loomis. 



New York. Hough. Providence. Caswell. 



Bossekop. Lottin. 



Catharinebourg. Kupffer. 



Zlatoouste. Kupffer. Bossekop. Lottin. 



Bossekop. Lottin. 



Christiania. Hansteen. Bossekop. Lottin 



Bossekop. Lottin. 



Dec. 



i Connaiss. de Terns. 1842, p. 392. 



2 Magnet, and Meteor. Obsenr. Washington, p. 352. 



9. 

 10. 

 11. 

 12. 

 12. 

 12. 

 12. 

 12. 

 13. 

 13. 

 13. 

 14. 

 14. 

 14. 

 15. 

 17. 

 17. 

 18. 

 19. 

 21. 

 22. 

 24. 

 25. 

 25. 

 25. 

 26. 

 27. 

 30. 



2. 



3. 



4. 



5. 



7. 



8. 



9. 

 10. 



Bossekop. 



Bossekop. 



Bossekop. 



Bossekop. 



Bossekop. 



Bossekop. 



Bossekop. 



Bossekop. 



Bossekop. 



Bossekop. 



Bossekop. 



Bossekop. 



New York. 



Bossekop. 



Christiania 



Lottin. 

 Lottin. 

 Lottin. 

 Lottin. 

 Lottin. 

 Lottin. 

 Lottin. 

 Lottin. 

 Lottin. 

 Lottin. 

 Lottin. 

 Lottin. 



Hough. 

 Lottin. 

 . Hansteen. 



Bossekop. Lottin. 



Boston. Hale. Lovering. 



New Haven. Herrick. Newton and Loomis. 



Providence, B. I. Caswell. 



Gerhardt. Eutin. Quetelet. 1 



Bossekop. Lottin. Slough. Herschel. 



New Haven. Herrick. Newton and Loomis 



Kingussie, Scotland. Rutherford. 2 



Bossekop. Lottin. Paris. Bouvard. 



Boston. Hale. Lovering. New York. Hough 



New Haven. Herrick. Newton and Loomis 



Christiania. Hansteen. Bossekop. Lottin 



Bossekop. Lottin. 



Kingussie. Rutherford. 



Christiania. Hansteen. 



Bossekop. Lottin. 



Bossekop. Lottin. 



Bossekop. Lottin. 



Christiania. Hansteen. 



Christiania. Hansteen. 



Boston. Hale. Lovering. Bossekop 



New Haven. Herrick. Newton and Loomis 



New York. Hough. Washington. Gilliss. 



Bossekop. Lottin. 



Bossekop. 

 Bossekop. 



Lottin. 

 Lottin. 

 Lottin. 



New York. 



Bossekop. 



Bossekop. 



Bossekop. 



Bossekop. 



Bossekop. 



Bossekop. 



Bossekop. 



Bossekap. 



Bossekop. 



Bossekop. 



Hough. 

 Lottin. 

 Lottin. 

 Lottin. 

 Lottin. 

 Lottin. 

 Lottin. 

 Lottin. 

 Lottin. 

 Lottin. 

 Lottin. 



Bossekop. Lottin. 



1 Pogg. Ann. XL VI. 662. 



2 Proc. Brit. Assoc. VIII. 29. 



