124 



ON THE PERIODICITY OF THE AURORA EOREALIS. 



Mar 



Feb. 24. 

 " 26. 

 " 27. 

 " 28. 



1. 



2. 



3. 



4. 



5. 



5. 



5. 



6. 



7. 



9. 

 10. 

 10. 

 11. 

 15. 

 15. 

 15. 

 1G. 

 16. 

 17. 

 18. 

 18. 

 19. 

 20. 

 21. 

 22. 

 23. 

 24. 

 25. 

 2G. 

 27. 

 31. 



1. 



2. 



3. 



5. 



6. 



7. 



8. 



8. 



8. 



9. 



Bossekop. 

 Bossekop. 

 Bossekop. 

 Bosselcop. 

 Bossekop. 

 Bossekop. 

 Bossekop. 

 Bossekop. 

 New York. 

 Fort Confidence. 

 Bossekop. Lottin 

 Bossekop. 

 Bossekop. 

 Bossekop. 

 lop 



Lottin. 

 Lottin. 

 Lottin. 

 Lottin. 

 Lottin. 

 Lottin. 

 Lottin. 

 Lottin. 

 Hough. Providence. 

 Simpson. 1 



Caswell. 



Portobelh. Necker. 



Lottin. 



Lottin. 



Lottin. 



Lottin. 



Neio Haven. Herrick. Newton and Loomis. 

 New York. Hough. Bossekop. Lottin. 

 Bossekop. Lottin. 



New Haven. Herrick. Newton and Loomis. 

 New York. Hough. Newberry. Johnson. 

 Bossekop. Lottin. 

 New York. Hough. 

 Christiania. Hansteen. 

 Bossekop. Lottin. 

 Christiania. Hansteen. 

 Portobelh. Necker. 



New York. Hough 

 Bossekop. Lottin. 

 Bossekop. Lottin. 

 Washington, D. C. 

 Bossekop. Lottin. 

 New York. 

 Bossekop. 

 Bossekop. 

 Bossekop. 

 Christiania, 



Bossekop. Lottin. 

 Bossekop. Lottin. 

 Bossekop. Lottin. 



Gilliss. 



Apr 



Hough. Bossekop 

 Lottin. Portobello. 

 Lottin. 

 Lottin. 



Hansteen. Bossekop. 



Lottin. 

 Necker. 



Lottin. 



Bossekop. Lottin. 



Bossekop. Lottin. 



New York. Hough. Bossekop. Lottin. 



Bossekop. Lottin. 



Bossekop. Lottin. 



New York. Hough. Bossekop. Lottin. 



New Haven. Herrick. Newton and Loomis. 



New York. Hough. Bossekop. Lottin. 



Christiania. Hansteen. 



Christiania. Hansteen. 



1 Simpson says of the aurora at Fort Confidence, Lat. 67° N. 

 Long. 119°. E. : " Every clear night, when not eclipsed by the 

 moon, it was to be seen ; but was brightest and most active in the 

 mornings some time before daylight." Narrative of the Discov. 

 in N. C. Amer. p. 330. 



Apr. 11. 



" 12. 



" 13. 



" 13. 



" 14. 



" 15. 



" 16. 



" 17. 



" 18. 



" 20. 



" 21. 



" 21. 



" 22. 



" 28. 

 May 4. 



" 5. 



" 5. 



" 5. 



" 7. 



« 7. 



" 9. 



" 10. 



" 10. 



" 11. 



" 11. 



" 12. 



" 14. 



" 14. 



" 15. 



" 15. 



" 16. 



" 17. 



" 31. 

 June 6. 



" 7. 



« 7. 



" 12. 

 July 3. 



" 3. 



" 4. 



" 30. 

 Aug. 10. 



" 10. 



» 20. 



" 20. 



" 21. 



" 21. 



" 22. 



Lottin. 



Bossekop. Lottin 



Portobelh. 



Christiania. 



New York. 



Christiania. 



Christiania. 



New York. 



Newberry. 



Bossekop. 



Bossekop. 



New York. 



New Haven 



Newberry. 



New York. 



Newberry. 



New York. 



New Haven 



New York. Hough. Christiania. Hansteen. 



Brussels. Quetelet. Arago. 



France and Italy. Arago. 



Saint Brice. Lalanne. 



Herrick. Newton and Loomis. 



Hough. Providence. Caswell. 

 Herrick. Newton and Loomis. 



Hough. Boston. 

 Herrick. Newton and Loomis. 



Hough. 



Hough. 

 Herrick. Newton and Loomis. 

 Herrick. Newton and Loomis. 

 R. I. Caswell. 



Hough. 



Necker. 



Hansteen. 



Hou : h. Bossekop 

 Hansteen. 



Hansteen. 



Hough. 

 Johnson. 

 Lottin. 

 Lottin. 



Hough. 



Herrick. Newton and Loomis. 

 Johnson. 



Hough. 

 Johnson. 



Hough. 

 Herrick. Newton and Loomis. 



New Haven. 

 New York. 

 New Haven. 

 New York. 

 Worcester. 1 

 New York. 

 New York. 

 New Haven 

 Neio Haven, 

 Providence, 

 New York. 

 New York. 

 New Haven. 

 Neio Haven. 

 New York. 

 New Haven. 

 New York. 

 New Haven. 

 New York. 

 New York. 

 New Haven. 

 New Haven. 

 New York. 

 New Haven. 

 New York. 

 Scandinavia 



Hough. 



Herrick. 



Herrick. 

 Hough. 



Newton and Loomis. 



Newton and Loomis. 



Washington. Gilliss. 



Herrick. Newton and Loomis. 



Hough. 



Herrick. Newton and Loomis. 

 Hough. 

 Hough. 

 Herrick. Newton and Loomis. 

 Herrick. Newton and Loomis. 

 Hough. 



Herrick. Newton and Loomis. 

 Hough. 

 Lottin, &c. 2 

 Ml. Ord of Caithness, Scotl. Necker. 

 New York. Hough. 



1 Med. and Surg. Journ. Boston. 



2 Observ. Magnet. Comm. Nord. 



XX. 291. 



