ON THE PERIODICITY OF THE AURORA BOREALIS. 



85 



June 14. 



" 15. 



" 16. 



" 18. 



" 19. 



" 24. 

 July 1. 



" 4. 



" 4. 



" 11. 



" 13. 



" 13. 



" 13. 



" 13. 



" 13. 



" 13. 



" 13. 



" 13. 



" 13. 



" 13. 



" 13. 



" 13. 



" 14. 



" 14. 



" 14. 



" 14. 



" 14. 



" 16. 



" 18. 



" 20. 



« 22. 



" 23. 



" 30. 

 Aug. 1. 



" 1. 

 1. 



" 7. 



" 7. 



" 7. 



" 7. 



" 10. 



" 10. 



" 10. 



" 10. 



" 13. 



" 19. 



" 19. 



" 19. 



" 19. 



" 21. 



Cambridge. 

 Cambridge. 

 New Haven. 

 New Haven. 

 Cambridge. 

 Mannheim. 

 New Haven. 



Wigglesworth. Lovering. 

 Williams. 



Stiles. Loomis. 

 Stiles. Loomis. 



Williams. 



Hemmer. Rome. Calandrelli. 

 Stiles. Loomis. 

 Salem. Holyoke. Lovering. 

 New Haven. Stiles. Loomis. 

 Erfurt. Planer. 



Cambridge. Wigglesworth. Lovering. 

 Cambridge. Williams. 

 Salem. Holyoke. Lovering. 

 New Haven. Stiles. Loomis. 

 Bologna. Matteucci. Mannheim. Hemmer. 

 Padua. Toaldo. Rome. Calandrelli. 

 Huda. Bruna. Sagan. Preus. 

 Rochelle. Seignette. Erfurt. Planer. 

 Marseilles. Silvabella. Spain. Rico. 

 Berne. Studer. Paris. Cassini. 

 Berlin. Beguelin and Achard. 

 Montmorenci. Cotte. 

 Cambridge. Wigglesworth. Lovering. 

 Cambridge. Williams. 

 Salem. Holyoke. Lovering. 

 New Haven. Stiles. Loomis. 

 Bologna. Matteucci. Padua. Toaldo. 

 Bologna. Matteucci. 

 Salem. Holyoke. Lovering. 

 Mannheim. Hemmer. 

 Mannheim. Hemmer. Sagan. Preus. 

 Salem. Holyoke. Lovering. 

 Berlin. Beguelin and Achard. 

 Cambridge. Wigglesworth. Lovering. 

 Cambridge. Williams. 

 Salem. Holyoke. Lovering. 

 Ratisbon. Heinrich. Jena. Zeissing. 

 Paris. Cassini. Kendal. Dalton. 

 Gottingen. Gatterer. Berlin. Achard. 

 Erfurt. Planer. Mount St. Gothard, Milan. 

 Cambridge. Wigglesworth. Lovering. 

 Cambridge. Williams. 

 Salem. Holyoke. Lovering. 

 Stockholm. Nicander. Paris. Cassini. 

 Salem. Holyoke. Lovering. 

 Cambridge. Wigglesworth. Lovering. 

 Cambridge. Williams. 

 Salem. Holyoke. Lovering. 

 Kendal. Dalton. Mannheim. Hemmer. 

 Cambridge. Williams. 



Aug. 21. 



" 25. 



" 30. 



Sept. 6. 



" 6. 



6. 

 " 6. 



6. 

 " 6. 

 " 7. 

 " 7. 

 " 7. 

 " 8. 

 " 9. 

 " 10. 

 " 18. 

 " 18. 

 " 18. 

 19. 

 " 23. 

 " 26. 

 " 28. 

 " 29. 

 " 30. 

 " 30. 



1. 



2. 



3. 



4. 



4. 



4. 



5. 



5. 



5. 



5. 



5. 



5. 



5. 



5. 



5. 



6. 



6. 



6. 



6. 



6. 



6. 



6. 



6. 



6. 



6. 



Edsberg. Wilse. Paris. Cassini. 



Oct. 



Mannheim 

 Jlann/teim. 

 Cambridge. 

 Cambridge. 

 Salem. Holyoke. 

 New Haven. Stile 



Hemmer. 



Hemmer. 



Wigglesworth. Lovering. 



AVilliams. 



Lovering. 



Loomis. Saga?i. Preus. 

 Gatterer. 



Bologna. Matteucci. Gottingen. 

 Edsberg. Wilse. Paris. Cassini. 

 Edsberg. Wilse. Paris. Cassini. 

 Mannheim. Hemmer. Jena. Zeissing. 

 Stockholm. Nicander. 

 Mannheim. Hemmer. 

 Edsberg. Wilse. Stockholm. Nicander. 

 Sagan. Preus. 



Cambridge. Wigglesworth. Lovering. 

 Cambridge. Williams. 

 Salem. Holyoke. Lovering. 

 Kendal. Dalton. 



Mannheim. Hemmer. Stockholm. Nicander. 

 Prague. Strnad. 

 Mannheim. Hemmer. 

 Edsberg. Wilse. Moscow. Stritter. 

 Edsberg. Wilse. Mannheim. Hemmer. 

 Stockholm. Nicander. 

 Edsberg. Wilse. Sagan. Preus. 

 Edsberg. Wilse. • 

 Moscow. Stritter. 



Cambridge. Wigglesworth. Lovering. 

 Cambridge. Williams. Sagan. Preus. 

 Kendal. Dalton. Jena. Zeissing. 

 Cambridge. Wigglesworth. Lovering. 

 Cambridge. Williams. 

 Salem. Holyoke. Lovering. Jena. Zeissing. 

 Gottingen. Gatterer. Sagan. Preus. 

 Mannheim. Hemmer. Ratisbon. Heinrich. 

 Bavaria. Kettel. Prague. Strnad. 

 Erfurt. Planer. Edsberg. Wilse. 

 Bologna. Matteucci. Rome. Calandrelli. 

 Munich. Iluebpauer. Wiirzburg. Egel. 

 Moscow. Stritter. Montmorenci. Cotte. 

 Geneva. Senebier. Deluc. 1 

 Wiirzburg. Egel. Marseilles. Silvabella. 

 St. Petersburg. Euler. Sagan. Preus. 

 Paris. Cassini. Erfurt. Planer. 

 Peissenberg. Schwaiger. Berne. Studer. 

 Tigurina. Aedes. Magold. 

 Bologna. Matteucci. Rome. Calandrelli. 

 Kendal. Dalton. Gottingen. Gatterer. 

 Padua. Toaldo. Munich. Huebpauer. 



