ON THE PERIODICITY OF THE AURORA BOREALIS. 



117 



Feb. 3. 

 " 4. 

 4. 

 " 5. 

 " 6. 

 " 7. 

 " 7. 

 " 8. 

 " 14. 

 " 24. 

 " 25. 

 " 25. 

 " 26. 

 " 26. 

 " 27. 

 " 27. 

 " 28. 

 Mar. 1. 

 " 2. 

 " 3. 

 « 4. 

 " 5. 

 6. 

 " 14. 

 " 15. 

 " 16. 

 « 17. 

 " 18. 

 « 30. 

 Apr. 17. 

 June 21. 

 " 28. 

 July 29. 

 Aug. 19. 

 " 22. 

 Sept. 4. 

 " 4. 

 " 7. 

 " 9. 

 " 22. 

 " 2:;. 

 " 24. 

 " 2G. 

 Oct. 18. 

 " 27. 

 Nov. 17. 

 " 17. 



Pakhtoussoff. Kupffer. 



Back and King. 

 Pakhtoussoff. Kupffer. 

 Pakhtoussoff. Kupffer. 



Back and King. 

 Araso. 



Nova Zembla. 



Fort Reliance. 



Nova Zembla. 



Nova Zembla. 



Fort Reliance. 



England. Hough. 



Prussia. Feldt. 1 



Fort Reliance. Back and King. 



Fort Reliance. Back and King. 



Fort Reliance. Back and King. 



New York. Hough. 



Fort Reliance. Back and King. 



New Fori: Plough. 



Fort Reliance. Back and King. 



New York. Hough. 



Fort Reliance. Back and King. 



Fort Reliance. Back and King. 



New York. Hough. 



Fort Reliance. Back and King. 



Fort Reliance. Back and King. 



Fort Reliance. 

 Fort Reliance. 

 Fort Reliance. 

 Fort Reliance. 

 Fort Reliance. 

 Fort Reliance. 

 Fort Reliance. 

 Fort Reliance. 

 New York. 

 New York. 

 New York. 

 Neio York. 

 New York. 

 New York. 

 New York. 

 New York. 

 Philadelphia 



Back and King. 



Back and King. 



Back and King. 



Back and King. 



Back and King. 



Back and King. 



Back and King. 



Back and King. 

 Hough. 

 Hough. 

 Hough. 

 Hough. 

 Hough. 

 Hough. 

 Hough. 



Hough. New Haven. 

 . Hough. 



New York. Hough. 

 New York. Hough. 

 New York. Hough. 

 New York. Hough. 

 New York. Hough. 

 New York. Hough. 

 Forli, Roman Slates. Hough. 

 ■ New York. Hough. 

 Boston. Hale. Lovering. 

 Newberry. Johnson. New York. 



Loomis. 



Nov.17. 



" 17. 



" 17. 



" 18. 



" 18. 



" 18. 



" 18. 



" 18. 



" 18. 



" 19. 



" 26. 

 Dec. 10. 



" 10. 



" 11. 



" 21. 



Feb. 11. 



" 17. 



" 22. 

 Mar. 17. 



Apr. 8. 



" 11. 



" 12. 



" 18. 



" 18. 



" 19. 



" 20. 



" 21. 



" 22. 



" 22. 



" 22. 



« 22. 



« 22. 



" 23. 



" 24. 

 May 7. 



New Haven. Loomis. 1 Providence. Caswell. 

 Ashurst. Snow. Danse. Stevenson. 2 

 Prussia. Arago. 8 

 Boston. Hale. Lovering. 

 Providence, R. I. Caswell. 

 New York. Hough. Neio Haven. Loomis. 

 Edinburgh. Galbraith. 4 JJunse. Stevenson. 

 Woohvich. Sturgeon. Armagh. Robinson. 6 



Hough. 



» Pore. Ann. XXXV. 378. 



France. Arago. 

 Quetelet. 



Quetelet. 



Newberry. Johnson. 



Brussels. Quetelet. 

 New York. Hough 

 New York. Hough, 

 New York. Hough, 

 New Haven. Loomis. 6 

 Canada. Bonnycastle. 7 

 New Haven. Loomis. 



1836. 



New York. Hough. 



Newberry. Johnson. 



New York. Hough. 



New York. Hough. 



New York. Hough. 



New York. Hough. 



New York. Hough. 



United States. Bache. 8 



At Sea. Quetelet. 9 



New York. Hough. Quetelet. 



New York. Hough. 



New York. Hough. Maryland. 



Boston. Hale. Lovering. 



Newberry. Johnson. Providence. Caswell. 



New Haven. Loomis. 10 



High Barns near Sunderland. Ettrick. 11 



Lai. 46°. Long. 44°. Duhamel. Arago. 



New York. Hough. 



New York. Hough. 



New York. Hough. 



Providence. Caswell. 



i Amer. Journ. Sci. XXIX. 388. 

 2 Phil. Mag. Third Series, VI. 21. 



8 Phil. Mag. Third Series, XIX. 579. 

 4 Edin. New Phil. Journ. XX. 205. 



6 Phil. Mag. VIII. Third Series, 134, &c. Nov. 16, printed by 

 mistake. See p. 236. Proc. Brit. Assoc. V. 32. Phil. Trans. 

 1836, p. 31. 



6 Amer. Jonrn. Sei. XXXII. 217. 



' Amer. Journ. Sci. XXX. 132. 



6 Bull. del'Aead. Brux. IV. 



9 Compt. Rend. III. 519. 



>° Amer. Journ. Sci. XXXI. 85. 

 " Phil. Mag. Third Series, IX. 74. 



