ON THE PERIODICITY OF THE AURORA BOREALIS. 



125 



All£ 



Sept. 



Oct. 



l Connais. de Tems. 1843, p. 408. 



Kaajiord. Thomas. 

 Kaafiord. Thomas. 



New York. Hough. 



Scandinavia. Lottin. 



Kaafiord. Thomas. 



Kaafiord. Thomas. 



New Haven. Herrick. Newton and Loomis. 



Christiania. Hansteen. 



Scandinavia. Lottin. Kaafiord. Thomas. 



Kaafiord. Thomas. 



New Haven. Herrick. Newton and Loomis. 



New York. Hough. 



Scandinavia. Lottin. Kaafiord. Thomas. 



New Haven. Herrick. Newton and Loomis. 



Kaafiord. Thomas. 



Christiania. Hansteen. Sky. Necker. 



Scandinavia. Lottin. Kaafiord. Thomas. 



Kaafiord. Thomas. Scandinavia. Lottin. 



Christiania. Hansteen. Sky. Necker. 



New York. Hough. Kaafiord. Thomas. 



Scandinavia. Lottin. Kaafiord. Thomas. 



Kaafiord. Thomas. 



Kaafiord. Thomas. 



Kaafiord. Thomas. Scandinavia. Lottin. 



Kaafiord. Thomas. 



New Haven. Herrick. Newton and Loomis. 



New York. Hough. 



Brussels. Quetelet. France. Arago. 



Pome. Matteucci. Eutin. Roth. Schmidt. 



Kaafiord. Thomas. Paris. Bouvard. 



Kaafiord. Thomas. Eutin. Roth. Schmidt. 



Kaafiord. Thomas. 



Kaafiord. Thomas. 



Sky. Necker. 



Christiania. Hansteen. 



Sky. Necker. Arago. Kaafiord. Thomas. 



Kaafiord. Thomas. 



Spain. Rico. 1 



Kaafiord Thomas. Eutin. Roth. Schmidt. 



Kaafiord. Thomas. 



Christiania. Hansteen. 



New Haven. Herrick. Newton and Loomis. 



New York. Hough. Christiania. Hansteen. 



New Haven. Herrick. Newton and Loomis. 



Kaafiord. Thomas. Bogosloivski. Kupffer. 



Kaafiord. Thomas. 



New Haven. Herrick. Newton and Loomis. 



Kaafiord. Thomas. 



Christiania. Hansteen. Kaafiord. Thomas. 



New Haven. Herrick. Newton and Loomis. 



1 Mem. Acad. Cienc. Madrid. III. 77. 



