118 



ON THE PERIODICITY OF THE AURORA BOREALIS. 



May 8. 

 8. 

 " 13. 

 " 19. 

 « 20. 

 June 1. 

 " 4. 

 5. 

 « 7. 

 " 8. 

 " 9. 

 " 10. 

 " 11. 

 " 12. 

 " 13. 

 July 3. 

 " 6. 

 " 10. 

 " 12. 

 " 16. 

 " 19. 

 " 23. 

 " 27. 

 » 30. 



" 31. 



" 31. 

 Aug. 1. 



" 2. 



« 2. 

 4. 



- 10. 



" 11. 



" 11. 



« 12. 



« 13. 



" 14. 



" 15. 



" 16. 



" 17. 



" 19. 



" 21. 



" 30. 

 Sept.13. 



New York. Hough. New Haven 



Canada. Bonnycastle. 



New York. Hough. 



New York. Hough. Quetelet. 



Bache. 2 



New York. Hough. 



Hough. 



Hough. 



Hough. 



Hough. 



Hough. 



Hough. 



Hough. 



Hough. 



Hough. 



Hough. 



Hough. 



Hough. 



Hough. 



Hough. 



Hough. 



Hough. 



Hough. 



Hough. 



Hough. 

 Olmsted. Loomis. 



Hough. 



Hough. Providence. 

 . Olmsted. Loomis. 



Hough. 



Loomis. 1 



New York. 

 New York. 

 New York. 

 New York. 

 New York. 

 Netv York. 

 New York. 

 New York. 

 New York. 

 New York. 

 New York. 

 New York. 

 Neio York. 

 New York. 

 New York. 

 New York. 



New York. 

 New York. 

 New York. 



New Haven 



Neio York. 



New York. 



New Haven 



New York. 



Byde, Me of Wight? M. F. 



New York. Hough. 



G. Britain. 



Newberry. 



New York. 



New York. 



New York. 



New York. 



New York. 



New York. 



Providence. 



Newberry. 



New York. 



Providence. Caswell. 



Providence. Caswell. 



Caswell. 



Traill. 4 

 Johnson. New Haven. 



Hough. Port Henry. 



Hough. 



Hough. 



Hough. 



Hough. 



Hough. 



Caswell. 

 Johnson. 



Hough. 



Loomis. 6 

 Redfield. 6 



1 Amer. Jotim Sci. XXXII. 224. 



2 Bull, de l'Acad. Brux. IV. 72. 



8 Phil. Mag. Third Series, IX. 230. 

 4 Proc. Brit. Assoc. V. 82. 

 6 Amer. Journ. Sci. XXXII. 220. 

 6 Amer. Journ. Sci. XXXIII. 302. 



1837. 



Jan. 2. New Haven. Herrick. Loomis. 



" 14. New York. Hough. 



" 23. Methye Biver. Lat. 56°. Long.WG.° Simpson. 



" 24. New York. Hough. Quetelet. 



" 25. New York. Hough. Providence. Caswell. 



" 25. New Haven. Loomis. 8 



" 25. Near Bermuda. L. 22°N.Lg. 57. JF. Emmcti.* 



" 25. Newberry. Johnson. 



" 26. New York. Hough. 



" 26. Newberry. Johnson. 



Feb. 17. New York. Hough. 



" 18. New Haven. Loomis. 10 



" 18. Brussels. Quetelet. Gottingen. 



" 18. France. Darlu. Arago. 



» Phil. Mag. Third Series, X. 75 &c. 



2 Phil. Mag. Third Series, X. 76-7. 



8 Me'm. de l'Acad. St. Petersb. III. 469. 



4 Pogg. Ann. XXIX. 201. Edin. New Phil. Journ. XXIV. 222. 



6 Compt. Rend. V. 847. 



6 Compt. Rend. V. 847. 



' Bull, de l'Acad. Brux. IV. 72. 



8 Amer. Journ. Sci. XXXII. 177. 



9 Amer. Journ. Sci. XII. 42. Phil. Mag. Third Series, XII. 42. 

 1° Amer. Journ. Sci. XXXII. 396. 



