rs 



ON THE PERIODICITY OF THE AURORA BOREALIS. 



Nov. 15. Jena. Zeissing. Prague. Strnad. 



" 15. Ratisbon. Heinrich. Sagan. Preus. 



" 15. Dusseldorp. Phennings. Dijon. Maret. 



" 15. Peissenberg. Schwaiger. Erfurt. Planer. 



" 15. Munich. Huebpauer. Wiirzburg. Egel. 



" 15. Mannheim. Hemraer, &c. Padua. Toaldo. 



" 15. Mount St. Andex, Bavaria. Kettel. 



" 19. Spydberg. Wilse. Berlin. Beguelin. 



" 15. Laon. Cotte. 



Dec. 6. St. Petersburg. Euler. 



" 11. Cambridge. Wigglesworth. Lovering. 



" 11. Spydberg. Wilse. 



" 12. Spydberg. Wilse/ 



" 20. Spydberg. Wilse. 



" 29. St. Petersburg. Euler. 



" 31. Sagan. Preus. 



1785. 



Spydberg. Wilse. Stockholm. Nicander. 



Berlin. Beguelin. 1 



Tigurina Aedes. Gothard. 



Tigurina Aedes. Gothard. 



St. Petersburg. Euler. 2 



Tigurina Aedes. Gothard. 



Cambridge. Williams. 



Mannheim. Hemmer. 



Mannheim. Hemmer. 



Mannheim. Hemmer. 



Cambridge. Williams. 



Stockholm. Nicander. 



Spydberg. Wilse. 



Spydberg. Wilse. 



St. Petersburg. Euler. Sagan ? Preus. 



Stockholm. Nicander. Spydberg. Wilse. 



St. Petersburg. Euler. 



Paris. Cassini. 8 



Brussels. Mann. 4 



Stockholm. Nicander. 



St. Petersburg. Euler. 



Cambridge. Williams. Mannheim. Hemmer. 



Stockholm. Nicander. 



St. Petersburg. Euler. 



Mannheim ? Hemmer. 



Berlin. Beguelin. 5 Rochelle. Seignette. 



1 Ephem. Soc. Met. Palat. 



2 Acta Sci. Acad. Petrop. 1785. Pt. II. p. 322. 

 8 Mem. de l'Acad. 1 784. 



* Me'm de l'Acad. Brux. V. 438. 

 6 Ephem. Soc. Met. Palat. 



Apr. 30. Stockholm. Nicander. 



May 1. Cambridge. Williams. Brussels. Mann. 



" 9. Cambridge. Wigglesworth. Lovering. 



" 9. New Haven. Stiles. Loomis. 



" 15. Brussels. Mann. 



" 23. Spydberg. Wilse. Paris. Cassini. 



June 5. New Haven. Stiles. Loomis. 



" 14. Cambridge. Williams. 



" 28. Mannheim. Koenig and Hemmer. 1 



July 3. New Haven. Stiles. Loomis. 



" 4. Brussels. Mann. 



" 17. Cambridge. Williams. Brussels. Mann. 



" 24. Mannheim. Hemmer. 



" 24. Copenhagen. Bugge. 



« 24. St. Petersburg. Euler. 2 



Aug. 3. Brussels. Mann. 



" 9. New Haven. Stiles. Loomis. Padua. Toaldo. 



" 9. Berlin. Beguelin. St. Petersburg. Euler. 



" 11. Brussels. Mann. 



" 30. Mannheim. Hemmer. 



" 31. Middleburg. Van de Perre. 



Sept. 1. Stockholm. Nicander. 



" 3. Stockholm. Nicander. 



" 8. Cambridge. Wigglesworth. Lovering. 



" 8. Cambridge. Williams. 



" 8. New Haven. Stiles. Loomis. 



" 8. Spydberg. Wilse. St. Petersburg. Euler. 



" 9. Spydberg. Wilse. Stockholm. Nicander. 



" 11. St. Petersburg. Euler. 



" 12. St. Petersburg. Euler. 



" 13. Brussels. Mann. 



" 14. St. Petersburg. Euler. 



" 23. Mannheim. Hemmer. 



" 28. Stockholm. Nicander. 



29. Spydberg. Wilse. Stockholm. Nicander. 



3. Stockholm. Nicander. 



4. Sagan. Preus. Stockholm. Nicander. 



4. St. Petersburg. Euler. 



5. Mannheim. Koenig. Jena. Zeissing. 

 5. Moscoic. Stritter. Stockholm. Nicander. 



•' 5. St. Petersburg. Euler. 



; ' 6. Cambridge. Wigglesworth. Lovering. 



'•' 5. Cambridge. Williams. 



i( 6. Middleburg. Tan de Perre. 



" 8. Cambridge. Williams. 



" 9. Stockholm. Nicander. 



" 9. St. Petersburg. Euler. 



1 Aurora Borealis et Australis. 



2 Ephem. Soc. Met. Palat. 



ii 



Oct. 



ii 

 ii 

 ii 

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