ON THE PERIODICITY OF THE AURORA BOREALIS. 



119 



Feb. 18. 



" 18. 



" 18. 



" 18. 



" 25. 

 Mar. 1.* 



" 3. 



" 9. 



" 10. 



« 29. 



" 29. 



" 30. 

 Apr. 5. 



" 6. 



" G. 



*' 6. 

 6. 



" 6. 



" 7. 



" 8. 



" 10. 



" 21. 



" 21. 



" 25. 



" 27. 

 May 6. 



" 19. 



" 27. 



" 30. 



" 31. 

 June 1. 



" 2. 



" 2. 



" 3. 



" 24. 



" 24. 

 July 1. 



" 1. 



Ashhurst. Snow. Dublin. Lloyd. 1 

 Makerstoun. Brisbane. Forli. Matteucei. 2 

 Sidmouth. Heineken. Belfast. Stevelly. 8 

 Catharinebourg. KupfFer. 

 New York. Hough. 

 New York. Hougli. 



New York. Hough. Edinburgh. Necker. 5 

 New York. Hough. 

 New York. Hough. 

 New York. Hough. 



New Haven. Herrick. Newton and Loomis. 6 

 New York. Hough. 

 New York. Hough. 

 New Tork. Hough. 



New Haven. Herrick. Newton and Loomis. 

 Newberry. Johnson. 

 France. Morren. Germany. Quetelet. 



Arago. 



Christiania. 



Chrisliania. 



Cltristiania. 



New York. 



New York. 



New Haven. 



New York. 



New York. 



New Haven. 



England. Christie. 8 



New York. Hough. 



New Tork. 



New York. 



New York. 



New York. 



New Haven 



New York. 



Vermont Hough. 



England. Christie. 9 



Boston. Hale. Lovering. 



New York. Hough. Providence. Caswell 



Hansteen.' 



Hansteen. 



Hansteen. 

 Hough. 

 Hough. Neivberry. Johnson. 



Herrick. Newton and Loomis. 

 Hough. 

 Hough. 



Herrick. Newton and Loomis. 



Hough. 

 Hough. 

 Hough. 

 Hough. 

 Herrick. 

 HoukIi. 



Newton and Loomis. 



i Tliil. Mag. Third Scries, XII. 98. 



s Phil. Mag. Third Series, X. 494. 



8 Athenajum, 1837, p. 42. 



4 An aurora was seen in Spain in the spring of 1837. Me'm. 

 de l'Acad. Cienc. Madrid. III. 77. 



» Ann. Chem. et Phys. Third Scries, I. 271. 



6 From Merrick's Auroral Register, published in the Trans. 

 Conn. Acad. I. 9. 



' Nouv. Mem. de l'Acad. Brux. XX. 103. Bull, de l'Acad. 

 Brux. XXI. l*t. I. 282 &c. 



8 Proc. Brit. Assoc. VI. 29. 



8 Amer. Journ. Sci. XXXIV. 19. Proc. Brit. Assoc. VI. 29. 



July 1. 

 1. 



" 1. 



" 2. 

 2. 



" 3. 



" 7. 



" 25. 



" 29. 



" 29. 



" 31. 

 Aug. 3. 



" 17. 



" 25. 



" 25. 



" 25. 



" 26. 



" 27. 



" 27. 



" 28. 



" 28. 



" 28. 



" 29. 



" 31. 

 Sept. 3. 



" 3. 



" 6. 



" 6. 



" 7. 



" 8. 



" 9. 



" 11. 



" 18. 



" 20. 



" 20. 



" 20. 



" 21. 



" 21. 



" 21. 



" 22. 



" 22. 



" 23. 



" 23. 



" 23. 



" 23. 



" 24. 



" 24. 



1 Proc. 



2 Proc 



New Haven. Herrick. Newton and Loomis. 

 Virginia, N Carolina, and Georgia. Hough. 

 England. Christie. 1 



New Haven. Herrick. Newton and Loomis. 

 New York. Hough. England. Christie. 

 New Haven. Herrick. Newton and Loomis. 

 England. Christie. 

 New York. Hough. 



Herrick. Newton and Loomis. 

 Hough. Providence. Caswell. 

 Hough. 



Herrick. Newton and Loomis. 

 Hough. 



Hough. Newberry. Johnson. 

 Herrick. Newton and Loomis. 

 England. Christie. 2 Christiania. Hansteen. 

 New York. Hough. 



Herrick. Newton and Loomis. 

 Hansteen. 

 Hough. 

 Herrick. Newton and Loomis. 

 Hansteen. 

 Hough. 

 Hansteen. 

 Kupffer. 

 Hansteen. 

 Hough. 

 Hansteen. 

 Hough. 

 Hansteen. 

 Hansteen. 

 Kupffer. 



New Haven. 

 Burlington. 

 New York. 

 New Haven. 

 New York. 

 New York. 

 Neiv Haven. 



New Haven. 



Cltristiania. 



New York. 



New Haven. 



Cltristiania. 



New York. 



Christiania. 



Yakoutsk. 



Christiania. 



New York. 



Christiania. 



New York. 



Christiania. 



Christiania. 



Yakoutsk. 



New York. 

 New Haven. 

 Neio York. 

 Christiania. 

 New Haven. 

 New York. 

 Christiania. 



Hough. Yakoutsk. Hough. 

 Herrick. Newton and Loomis. 



Hough. 



Hansteen. 

 Herrick. Newton and Loomis. 



Hough. Providence. Caswell. 

 Hansteen. 

 New Haven? Herrick. Newton and Loomis. 

 Brussels. Quetelet. 



New Haven. Herrick. Newton and Loomis. 

 New York. Hough. 

 Christiania. Hansteeen. 

 Hamburg. Robert. Arago and Quetelet. 

 New Haven. Herrick. Newton and Loomis. 

 New York. Hough. Providence. Caswell. 



Brit. Assoc. VI. 29. 

 Brit. Assoc. VI. 29. 



