82 



ON THE PERIODICITY OF THE AURORA BOREALIS. 



Oct. 2. 

 2. 



» 3. 



" 10. 



" 12. 



" 13. 



" 13. 



" 13. 



•' 13. 



" 13. 



" 13. 



" 13. 



" 13. 



" 13. 



" 14. 



•' 16. 



" 1G. 



" 17. 



" 17. 



" 17. 



" 17. 



" 17. 



" 17. 



" 17. 



" 17. 



" 17. 



" 18. 



" 19. 



« 20. 



" 21. 



« 22. 



•■ 23. 



" 23. 



" 25. 



" 25. 



" 25. 



" .25. 



" 25. 



" 25. 



" 26. 



" 27. 



« 27. 



" 28. 



" 28. 

 Nov. 8. 



" 10. 



" 11. 



" 12. 



Home. Calandrelli. St. Petersburg. Euler. 



Spydberg. Wilse. 



Spydberg. Wilse. 



Mannheim. Hemmer. 



Sagan. Preus. 



Cambridge. Wiggles worth. Lovering. 



Cambridge. Williams. 



Salem. Holyoke. Lovering. 



Kendal. Dalton. Paris. Cassini. 



Delphi. Van Swinden. Padua. Toaldo. 



Mannheim. Hemmer. Erfurt. Planer. 



Sagan ? Preus. Stockholm. Nieander. 



St. Petersburg. Euler. 



Bllgrcre. 



Co 



Montmorenci. Cotte. 

 Hemmer. Padua. Toaldo. 



Stiles. Loomis. 

 Hemmer. 



Wigglesworth. Lovering. 

 AA'illiams. 



Loverins;. 



Copenhagen. 



Mannheim. 



New Haven 



Mannheim. 



Cambridge. 



Cambridge. 



Salem. Holyoke. 



Spydberg. Wilse. 



New Haven. Stiles. Loomis. 



Mannheim. Hemmer. Stockholm. Nieander. 



Brussels. Mann. Montmorenci. Cotte. 



Middleburg. Van de Perre. 



Delphi. Van Swinden. Sagan. Preus. 



Brussels. Mann. Spydberg. Wilse. 



Spydberg. Wilse. 



St. Petersburg. Euler. Spydberg. Wilse. 



Gothaab, Greenland. Ginge. 1 



Sagan ? Preus. 



Sagan ? Preus. Gothaab. Ginge. 



Stockholm. Nieander. 



Cambridge. Wigglesworth. Lovering. 



Cambridge. Williams. 



Salem. Holyoke. Lovering. Padua. Toaldo. 



Kendal. Dalton. Jena. Zeissing. 



Berlin. Beguelin. St. Petersburg. Euler. 



Prague. Strnad. Stockholm. Nieander. 



Stockholm. Nieander. Spydberg. Wilse. 



Salem. Holyoke. Lovering. 



Spydberg. Wilse. Gothaab. Ginge. 



Sagan. Preus. Gothaab. Ginge. 



Spydberg. Wilse. 



Paris. Cassini. 



Gothaab. Ginge. 



Stockholm. Nieander. 



Mannheim. Hemmer. Stockholm. Nieander. 



Nov. 12. 



" 13. 



" 13. 



" 14. 



" 14. 



" 15. 



" 15. 



" 16. 



" 16. 



" 16. 



" 16. 



" 17. 



" 18. 



" 18. 



" 19. 



" 20. 



" 20. 



" 21. 



" 21. 



" 21. 



" 22. 



" 28. 



" 29. 

 Dec. 1 3. 



" 5. 



" 7. 

 8. 



" 10. 



" 11. 



•' 12. 



" 13. 



" 14. 



" 15. 



" 15. 



" 18. 



" 20. 



" 22. 



" 24. 



" 25. 



" 25. 



" 26. 



" 31. 



St. Petersburg. Euler. 



New Haven. Stiles. Loomis. 



Spydberg. Wilse. 



Kendal. Dalton. Gothaab. Ginge. 



Copenhagen. Bugge. Spydberg. Wilse. 



Salem. Holyoke. Lovering. 



New Haven. Stiles. Loomis. Gothaab. Ginge, 



Cambridge. Wigglesworth. Lovering. 



Cambridge. Williams. 



St. Petersburg. Euler. Gothaab. Ginge. 



Stockholm. Nieander. Spydberg. Wilse. 



Gothaab. Ginge. Spydberg. Wilse. 



Lovering. 



Spydberg. Wilse. 



Gothaab. Ginge. 



Lovering. 



Salem. Holyoke. 



Gothaab. Ginge. 



Gothaab. Ginge. 



Mannheim. Hemmer. 



St. Petersburg. Euler. 



Cambridge. AVigglesworth. 



< 'ambridge. AVilliams. 



Salem. Holyoke. Lovering. Gothaab. Ginge. 



Gothaab. Ginge. 



Gothaab. Ginge. 



Gothaab. Ginge. 



Mannheim. Hemmer. 



Salem. Holyoke. Lovering. Brussels. Mann. 



Gothaab. Ginge. 



Gothaab. Ginge. 



Gothaab. Ginge. 



Gothaab. Ginge. 



Gothaab. Ginge. 2 



Gothaab. Ginge. 



Gothaab. Ginge. 



Salem. Holyoke. 



Gothaab. Ginge. 



Brussels. Mann. 



Middleburg. Van de Perre. 



Stockholm. Nieander. 



Stockholm. Nieander. Gothaab. 



Stockholm. Nieander. 



Gothaab. Ginge. Kendal. Dalton. 



Gothaab. Ginge. 



Stockholm. Nieander. 



1787. 



St. Petersburg. Euler. 



Lovering. 



St. Petersburg. 



Euler. 



Ginge. 



1 Ephem. Soc. Met. Palat. VII. 



Jan. 2. Stockholm. Nieander. 

 " 7. Stockholm. Nieander. Mannheim. Hemmer. 



1 There were thirty auroras seen in Greenland in November and 

 December, and sixteen in the following January. Ephem. Soc. 

 Met. Palat. VII. 



2 Schweigg. Jahr. XVI. 289. Edin. Phil. Journ. XII. 84. 



