58 



OF THE PERIODICITY OF THE AURORA BOREALIS. 



> Me'm. de l'Acad. 1761, p. 25. 



2 No observations were made at Upsal this year in January or 

 February. 

 s Me'm. de l'Acad. Sav. Etrang. VI. 110. 



Cambridge. Winthrop. Lovering. 



Upsal. Bergman. 



St. Petersburg. Braun. 



Upsal. Bergman. 



Upsal. Bergman. 



St. Petersburg. Braun. 



1763. 



Franeker. Yan Swinden. 1 



St. Petersburg. Braun. 2 



St. Petersburg. Braun. 



St. Petersburg. Braun. 



( ombridge. Winthrop. Lovering. 



St. Petersburg. Braun. 



Cambridge. Winthrop. Lovering. 



( iimbridge. Winthrop. Lovering. 



Cambridge. Winthrop. Lovering. 



St. Petersburg. Braun. 



Cambridge. Winthrop. Lovering. 



St. Petersburg. Braun. 



Upsal. Mallet. Reuss and Boue. 3 



Upsal. Bergman. Boue and Thompson. 



( 'arnbridge. Winthrop. Lovering. 



Newport, R. I. Stiles. Loomis. 4 



St. Petersburg. Braun. 



1764. 



St. Petersburg. Braun. 

 Newport, R. I. Stiles. Loomis. 

 St. Petersburg. Braun. 

 Cambridge. Winthrop. Lovering. 

 Upsal. Bergman. Boue. » 



St. Petersburg. Braun. Thompson. 

 St. Petersburg. Braun. 

 St. Petersburg. Braun. 

 St. Petersburg. Braun. 

 Cambridge. Winthrop. Lovering. 

 Newport, R. I. Stiles. Loomis. 

 .Si!. Petersburg. Braun. 

 St. Petersburg. Braun. 

 Oxford. Swinton. 5 

 Cambridge. Winthrop. Lovering. 

 Cambridge. Winthrop. Lovering. 

 Cambridge. Winthrop. Lovering. 

 Newport, R. I. Stiles. Loomis. 



1 Kamtz. Met. III. 467. 



2 N. Comm. Petrop. XI. 391. 



a Svenska Vetensk. Acad. XXV. 62. 

 4 Trans. Conn. Acad. Sci. I. 155. 

 6 Phil. Trans. LIV. 332. 



