ON THE PERIODICITY OF THE AURORA BOREALIS. 



139 





Jan. 1 . 

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 " 9. 

 « 9. 

 " 9. 

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 9. 

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13. 



19. 

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 « 30. 

 Feb. 1. 

 " 4. 

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 " 21. 



23. 



24. 



24. 



24. 



25. 



« 



1845. 



Makerstoun. Broun. Gothaab. Block. 



Gothaab. Block. Jakobshavn. Rudolph. 



Gothaab. Block. 



Nantes. Perrey. 1 



New York. Hough. Gothaab. Block. 



Cambridge. Bond. Lovering. 



New Haven. Herrick. Newton and Looniis. 



New York. Hough. Newberry. Johnson. 



Philadelphia. Bache. 2 



Providence, E. I. Caswell. Toronto. Sabine. 8 



Makerstoun. Broun. Dunse. Stevenson. 



Gothaab. Block. Yakoutsk. Kupffer. 



Hamburg. Schmidt. 



Sitka. Kupffer. Gothaab. Block. 



New Haven ? Herrick. Newton and Looniis. 



Gothaab. Block. Jakobshavn. Rudolph. 



Sitka. Kupffer. 



Hough. 

 Broun. 

 Broun. 

 Broun. 

 Broun. 



New York. 

 Makerstoun. 



Makerstoun. 



Makerstoun. 



Makerstoun. 



Makerstoun. 



Gothaab. Block 



Makerstoun. Broun 



Makerstoun. 



New Haven. 



Makerstoun. 



Makerstoun. 



Makerstoun. 



Gothaab. Block. 



Gothaab. Block. 



Broun. Jakobshavn. Rudolph. 



Gothaab. Block. 



Broun. Gothaab. Block. 



Herrick. Newton and Looniis. 



Broun. Jakobshavn. Rudolph. 



Broun. 



Broun. Gothaab. Block. 

 Gothaab. Block. 



Christiania. Hansteen. Makerstoun. Broun. 

 Gothaab. Block. 



Makerstoun. Broun. Gothaab. Block. 

 Gothaab. Block. 

 Gothaab. Block. 

 Gothaab. Block. 

 Gothaab. Block. 



Neto Haven ? Herrick. Newton and Looniis. 

 Gothaab. Block. 

 Gothaab. Block. 



New York. Hough. Newberry. Johnson. 

 Makerstoun. Broun. 



Gothaab. Block. Jakobshavn. Rudolph. 

 New Haven. Herrick. Newton and Looniis. 



1 Bull, de l'Acad. Brux. XII. Pt. I. p. 355. 



2 Magnet, and Meteor. Observ. Girard College, III. 2806. 

 8 Magnet, and Meteor. Observ. Toronto. II. 542. 



Feb. 25. 



" 25. 



" 25. 



" 26. 



■ 27. 



" 28. 



" 28. 

 Mar. 3. 



" 4. 



" 5. 



" 7. 



" 8. 

 9. 

 9. 



" 9. 



" 10. 



" 11. 



" 12. 



" 13. 



" 13. 



" 14. 



" 15. 



" 15. 



" 16. 



" 16. 



" 18. 



" 18. 



" 18. 



" 19. 



" 19. 



" 20. 



« 20. 



" 23. 



" 24. 



" 25. 



" 26. 



" 27. 



" 28. 



" 28. 



" 29. 



" 31. 



Apr. 1. 



7. 



" 9. 



" 13. 



" 13. 



" 13. 



" 14. 



New York. 



Newberry. 



Christiiuiiii. 



Jakobshavn. 



New York. 



Makerstoun. 



Hough. Providence. Caswell. 

 Johnson. 



Hansteen. Gothaab. 

 Rudolph. Gothaab. 

 Hough. Makerstoun. 



Broun. Jakobshavn, 



Block. 

 .Block. 



Broun. 

 Rudolph. 



Clerk. : 



Clerk. 

 Clerk. 



Lat. 62° S. Long. 71° E. 



Christiania. Hansteen. 



Gothaab. Block. 



Lat. 62° S. Long. 85° E. 



Lat. 62° S. Long. 91° E. 



Gothaab. Block. 



Neto Haven ? Herrick. Newton and Looniis. 



Gothaab. Block. 



Lat. 62° S. Long. 92° E. Clerk. 



Makerstoun. Broun. 



Gothaab. Block. 



Toronto. Sabine. Gothaab. Block. 



Toronto. Sabine. Gothaab. Block. 



Jakobshavn. Rudolph. 



Makerstoun. Broun. Gothaab. Block. 



Gothaab. Block. 



Lat. 56° S. Long. 103° E. Clerk. 



New Haven ? Herrick. Newton and Looniis. 



Jakobshavn. Rudolph. 



New Haven f Herrick. Newton and Looniis. 



Makerstoun. Broun. 



Lat. 53° S. Long. 110° E. Clerk. 



Lat. 51° S. Long. 111° E. Clerk. 



Makerstoun. Broun. 



Lat. 49° S. Long. 113° E. Clerk. 



Makerstoun. Broun. 



Makerstoun. Broun. Jakobshavn. Rudolph. 



Makerstoun. Broun. 



Makerstoun. Broun. 



Makerstoun. Broun. 



Christiania. Hansteen. 



Sitka. Kupffer. Christiania. Hansteen. 



Makerstoun. Broun. 



Makerstoun. Broun. 



Gothaab. Block. 



Jakobshavn. Rudolph. 



Gothaab. Block. 



Gothaab. Block. 



New Haven. Herrick. Newton and Looniis. 



New York. Hough. Makerstoun. Broun. 



Toronto. Sabine. 



New York. Hough. 



i Phil. Trans. 1846, p. 437. 



