74 



ON THE PERIODICITY OF THE AURORA BOREALIS. 



Jan. 2. 



1782. 



Ipswich. Cutler. 

 Prague. Strnad. 

 Mannheim. Koenig. 

 Berlin. Beguelin. 



Mannheim. Hemmer. Koenig. Sagan. Preus. 

 Mannheim. Hemmer, &c. 

 St. Petersburg. Euler. 1 

 Mannheim. Hemmer. 

 St. Petersburg. Euler. 

 Berlin. Beguelin. Erfurt. Planer. 

 Ipswich. Cutler. 



Tigurina Aedes, Bavaria. Gothard. 

 Prague. Strnad. Tigurina Aedes. Gothard. 

 Tigurina Aedes. Gothard. 

 St. Petersburg. Euler. 

 Prague. Strnad. Bologna. Matteucci. 

 Beziers. Bertholon. 2 

 Copenhagen. Bugge ? 

 Cambridge. Gannett. Ipswich. Cutler. 

 Mannheim. Koenig. Sagan. Preus. 

 New Haven. Stiles. Loomis. 

 Berlin. Beguelin. Prague. Strnad. 

 Copenhagen. Bugge ? Sagan. Preus. 

 Copenhagen. Bugge. 



Mannheim. Hemmer, &c. Berlin. Beguelin. 

 Montmorenci. Cotte. 8 

 Copenhagen. Bugge. Sagan. Preus. 

 Berlin. Beguelin. Copenhagen. 

 St. Petersburg. Euler. 

 St. Petersburg. Euler. 

 St. Petersburg. Euler. 

 St. Petersburg. Euler. 

 Ralisbon. Heinrich. 

 New Haven. Stiles. Loomis. 

 Cambridge. Gannett. Ipswich. 

 Cambridge. Gannett. Ipswich. 

 St. Petersburg. Euler. 

 St. Petersburg. Euler. 

 New Haven. Stiles. Loomis. 

 Cambridge. Gannett. Ipswich. 

 Copenhagen. Bugge. Montmorenci. 

 New Haven. Stiles. Loomis. 

 St. Petersburg. Euler. 

 Ipswich. Cutler. St. Petersburg. Euler. 

 Mannheim. Hemmer. Copenhagen. Bugge, 



i Acta Sci. Acad. Petrop., 1782. Pt. II., p. 371. 



2 Encyc. Method. I. 367. 



3 Journ. des Savans, 1782-3. 



Bugge. 



Cutler. 



Cutler. 



Cutler. 

 Cotte. 



Ipswich. Cutler. 



Loomis. 

 Loomis. 



May 6. Ipswich. Cutler. New Haven. Stiles. Loomis. 



" 7. Padua. Toaldo and Chiminello. 



" 7. Montmorenci. Cotte. 



" 9. Cambridge. Gannett. Ipswich. Cutler. 



" 9. Mannheim. Hemmer and Koenig. 



" 16. Vienna. Pilgram. 



" 17. St. Petersburg. Euler. 



" 18. Vienna. Pilgram. 



" 20. Berlin. Beguelin. 



" 22. Cambridge. Gannett. 



" 23. Berne. Studer. 



" 24. New Haven. .Stiles. 



June 1. New Haven. Stiles. 



" 4. Padua. Toaldo and Chiminello. 



" 5. Ipswich. Cutler. Mannheim. Koenig. 



" 6. Ipsivich. Cutler. New Haven. Stiles. Loomis. 



" 13 Mannheim. Hemmer, &c. 



July. 1 9. Cambridge. Gannett. Ipswich. Cutler. 



'' 10. Cambridge. Gannett. 



" 20. Ipswich. Cutler. New Haven. Stiles. Loomis. 



" 20. Mannheim. Hemmer and Koenig. 



" 31. Padua. Toaldo and Chiminello. 



Aug. 4. St. Petersburg. Euler. 



" 5. New Haven. Stiles. Loomis. 



" 12. New Haven. Smiles. Loomis. 



" 22. St. Petersburg. Euler. 



" 26. Cambridge. Gannett. Ipswich. Cutler. 



" 26. New Haven. Stiles. Loomis. 



" 27. Netc Haven. Stiles. Loomis. 



" 28. Ipswich. Cutler. New Haven. Stiles. Loomis. 



" 30. Slough. Herschel. 2 



Sept. 2. The Hague. Van Swinden. 



" 2. Brussels. Durondeau ? 3 



" 2. St. Petersburg. Euler. 



" 3. St. Petersburg. Euler. 



" 5. Ipswich. Cutler. 



" 6. Ipswich. Cutler. St. Petersburg. Euler. 



" 6. Sagan. Preus. The Hague. Van Swinden. 



" 9. New Haven. Stiles. Loomis. 



" 10. Mannheim. Hemmer. St. Petersburg. Euler. 



" 12. Cambridge. Wigglesworth. Lovering. 



" 12. Ipswich. Cutler. 



" 12. The Hague. Van Swinden. Padua. Toaldo. 



" 12. Mannheim. Hemmer, &c. Berlin. Beguelin. 



" 12. St. Petersburg. Euler. 



" 13. Cambridge. Wigglesworth. Lovering. 



1 One aurora was seen at Berlin this month, but the day is not 

 given by Beguelin. 



2 Nicholson's Journal, VI. 13. 



3 Mem. de l'Acad. Brux. IV. 607. 



