ON THE PERIODICITY OF THE AURORA BOREALIS. 



81 



May 30. Montmorenci. Cotte. 



31. Cambridge. Williams. 



31. Salem. Holyoke. Lovering. 



31. Paris. Cassini. Berlin. Beguelin. 1 



31. Montmorenci. Cotte. 



31. Delphi. Van Swinden. 



June 1. Salem. Holyoke. Lovering. 



1. Delphi. Van Swinden. 



4. Montmorenci. Cotte. 



5. Mannheim ? Hemmer. 

 19. Salem. Holyoke. Lovering. 

 19. New Haven. Stiles. Loomis. 



28. Delphi. Van Swinden. 

 30. Cambridge. Wigglesworth. Lovering. 

 30. Cambridge. Williams. 

 30. Salem. Holyoke. Lovering. 

 30. New Haven. Stiles. Loomis. Brussels. Mann 



July 1. Cambridge. Wigglesworth. Lovering. 



1. Cambridge. Williams. 



1. Salem. Holyoke. Lovering. 



1. New Haven. Stiles. Loomis. 



2. Cambridge. Wigglesworth. Lovering. 

 2. Cambridge. Williams. 

 2. Salem. Holyoke. Lovering. 



2. New Haven. Stiles. Loomis. 

 5. Cambridge. Wigglesworth. Lovering. 

 5. Cambridge. Williams. 

 5. Salem. Holyoke. Lovering. Paris. Cassini. 



15. Cambridge. Wigglesworth. Lovering. 



15. Cambridge. Williams. 



15. Salem. Holyoke. Lovering. 



15. Kendal. Dalton. Copenhagen. Bugge. 



1 6. Cambridge. Williams. 



17. Salem. Holyoke. Lovering. 



18. Berlin. Beguelin. 



19. Cambridge. Wigglesworth. Lovering. 



19. Cambridge. Williams. 



20. Salem. Holyoke. Lovering. Brussels. Mann. 

 22. Brussels. Mann. 



24. Berlin. Beguelin. Brussels. Mann. 



25. Montmorenci. Cotte. 

 27. Cambridge. Wigglesworth. Lovering. 

 27. Cambridge. Williams. 

 27. Salem. Holyoke. Lovering. 



29. Prague. Strnad. 

 Aug. 2. Brussels. Mann. 



3. Salem. Holyoke. Lovering. Brussels. Mann. 



This and the aurora of May 24th are not mentioned in the 

 Berlin Memoirs ; but in the Ephem. Soc. Met. Palat. 



VOL. X. 11 



Kendal. Dalton. 



Brussels. Mann. 



Kendal. Dalton. 



New Haven. Stiles. Loomis. 



Montmorenci. Cotte. 



Brussels. Mann. St. Petersburg. 



Brussels. Mann. 



Mannheim. Hemmer. Brussels. 



Euler. 



Mann. 



Wigglesworth. 



Williams. 



Lovering. 



Cambridge. 

 Cambridge. 

 Salem. Holyoke. Lovering. 

 New Haven. Stiles. Loomis. 

 St. Petersburg. Euler. 3fannheim. Hemmer. 

 New Haven. Stiles. Loomis. 

 Cambridge. Wigglesworth. Lovering. 

 Cambridge. Williams. 

 Salem. Holyoke. Loomis. 

 St. Petersburg. Euler. 

 Stockholm. Nicander. 

 Salem. Holyoke. Lovering. 

 Stockholm. Nicander. 

 St. Petersburg. Euler. 1 

 Salem. Holyoke. Lovering. 

 Mannheim. Hemmer. 

 Mannheim. Hemmer. 

 Kendal. Dalton. St. Petersburg, Euler. 

 St. Petersburg. Euler. 

 St. Petersburg. Euler. 

 Mannheim. Hemmer. Berlin. Beguelin. 

 Stockholm. Nicander. Paris. Cassini. 

 Kendal. Dalton. Delphi. Van Swinden. 

 Montmorenci. Cotte. 

 Kendal. Dalton. Sagan ? 

 Stockholm. Nicander. 

 Kendal. Dalton. 

 Stockholm. Nicander. 

 Stockholm. Nicander. 

 Stockholm. Nicander. 

 Kendal. Dalton. 

 ( 'canbridge. Wigglesworth. 

 Cambridge. Williams. 

 Salem. Holyoke. Lovering. 

 Cambridge. Wigglesworth. Lovering. 

 Cambridge. Williams. 

 Salem. Holyoke. Lovering. Kendal. Dalton. 

 Copenhagen. Bugge. 



Stockholm. Nicander. Spydberg. Wilse. 

 St. Petersburg. Euler. Spydberg. Wilse. 



Preus 



Lover 



i Ephem. Soc. Met. Pal. 



