ON THE PERIODICITY OF THE AURORA BOREALIS. 



165 



May 31. 



" 31. 



June 1. 



1. 



1. 



2. 



6. 



8. 



9. 



9. 



9. 

 " 14. 

 " 14. 

 " 30. 

 July 4. 

 " 10. 

 " 10. 

 " 11. 

 " 12. 

 " 12. 

 " 12. 

 " 12. 

 " 12. 

 " 16. 

 " 18. 

 " 23. 



- 23. 



- 26. 

 " 27. 



Aug. 7. 

 " 11. 

 " 20. 

 " 25. 

 « 26. 

 » 30. 

 " 31. 

 " 31. 

 Sept. 1. 



1. 

 « 1. 



1. 

 " 2. 



2. 



2. 

 " 2. 

 " 2. 

 " 2. 



2. 



i Amer. Journ. Sci. Second Series, XVI. 288. 



Angeln in Schleswig. Jahn. 

 Catharinebourg. Kupffer. Prague. Bohro. 1 

 Cambridge. Bond. Lovering. 

 Worcester. Chandler. 



Burlington. Thompson. Newberry. Johnson. 

 St. Martin. Smallwood. Clifton. Jahn. 

 Cambridge. Bond. 'Lovering. 

 Kupffer. 

 Jahn. 



Thompson. 



Smallwood. 



Smallwood. 



Thompson. 



Smallwood. 



Yakoutsk. 



Arbroath. 



Burlington. 



St. Martin. 



St. Martin. 



Burlington. 



St. Martin. 



Durham. Jahn. 



Cambridge. Bond. Lovering. 



<Sf. Martin. Smallwood. 



Cambridge. Bond. Lovering. 



Burlington. Thompson. Newberry. Johnson. 



New Haven. Bradley. Newton and Loomis. 



Bedfordshire. Jahn. Minister. Heis. Jahn. 



New Haven. Herrick. Newton and Loomis. 



Newberry. Johnson. 2 Burlington. Thompson. 



Minister. Heis. Jahn. 



Cambridge. Bond. Lovering. 



Takoatsh. Kupffer. 



St. Martin. Smallwood. 



Yakoutsk. Kupffer. 



Van Rensselaer Harbor. Kane. 



Hammerfest. Noodt. 



Van Rensselaer Harbor. Kane. 



St. Martin. Smallwood. 



Van Rensselaer Harbor. Kane. 



Van Rensselaer Harbor. Kane. 



Van Rensselaer Harbor. Kane. 



Burlington. Thompson. Newberry. Johnson. 



St. Martin. Smallwood. Hammerfest. Noodt. 



Van Rensselaer Harbor ■? Kane. 



Yakoutsk. Kupffer. 



Burlington. Thompson. 



Van Rensselaer Harbor ? Kane. 



St. Martin. Smallwood. 



New Haven. Bradley. Newton and Loomis. 



Cambridge. Bond. Lovering. 



Van Rensselaer Harbor. Kane. 



Cambridge. Bond. Lovering. 



St. Martin. Smallwood. 



Van Rensselaer Harbor. Kane. 



1 Magnet, et Meteor. Obscrv. zu Prag. 1853, p. 107. 



1 Regents' Reports of the Univ. New York, 1854, p. 308. 



