84 



ON THE PERIODICITT OF THE AURORA BOREALIS. 



Hemmer. 

 Bugge. 



Hemmer. 

 Preus. 



Nicander. 



Munich. Huebpauer. Sagan. Preus. 



Edsberg. Wilse. Ralisbon. Heinrich. 



Cambridge. Williams. 



Salem. Holyoke. Lovering. 



New Haven. Stiles. Loornis. 



Stockholm. Nicander. 



Stockholm. Nicander. 



Kendal. Dalton. Mannheim. 



Edsberg. Wilse. Copenhagen 



Montmorenci. Cotte. 



Mannheim. Hemmer. Stockholm. Nicander. 



Gothaab. Ginge. Eochelle. Seignette. 



Munich. Huebpauer. Sagan. Preus. 



Cambridge. Williams. 



Jena. Zeissing. Gottingen. Gatterer. 



Copenhagen. Bugge. Erfurt. Planer. 



Edsberg. Wilse. Mannheim. 



Eatisbon. Heinricb. Sagan. 



Gothaab. Ginge. 



Stockholm. Nicander. 



Sagan. Preus. 



Gothaab. Ginge. Stockholm. 



Stockholm. Nicander. 



Sagan. Preus. 



Cambridge. Wigglesworth. Lovering. 



Cambridge. Williams. 



Salem. Holyoke. Lovering. 



Stockholm. Nicander. 



St. Petersburg. Euler, 



Stockholm. Nicander. 



Sagan. Preus. # 



Mannheim. Hemmer. Stockholm. Nicander, 



Cambridge. Wigglesworth. Lovering. 



Cambridge. Williams. 



Salem. Holyoke. Lovering. 



Stockholm. Nicander. Padua. Toaldo. 



Cambridge. Williams. 



Salem. Holyoke. Lovering. 



Edsberg. Wilse. Stockholm. Nicander. 



St. Petersburg. Euler. 



Eochelle. Seignette. Montmorenci. Cotte. 



Erfurt. Planer. Kendal. Dalton. 



Padua. Toaldo. Sagan. Preus. 



Mannheim. Hemmer. Gottingen. Gatterer. 



Kendal. Dalton. Mannheim. Hemmer. 



Stockholm. Nicander. 



St. Petersburg. Euler. 



Copenhagen. Bugge. Eochelle. Seignette. 



Copenhagen. Bugge. 



Eochelle. Seignette. 



Apr. 23. Mannheim. Hemmer. 



" 26. Kendal. Dalton. Jena. Zeissing. 



May 1 4. Gottingen. Gatterer. 



" 10. Eochelle. Seignette. 



" 11. Eatisbon? Heinrich. 



" 12. Kendal. Dalton. Bologna. Matteucci. 



" 13. Prague. Strnad. Padua. Toaldo. 



" 13. Montmorenci. Cotte. Berne. Studer. 



" 13. Borne. Calandrelli. Bitda. Bruna. 



" 13. Eatisbon. Heinrich. Sagan. Preus. 



" 13. Gottengen. Gatterer. Munich. Huebpauer. 



" 13. Stockholm. Nicander. Eochelle. Seignette. 



" 13. Paris. Cassini. Jena. Zeissing. 



" 13. Marseilles. Silvabella. Bologna. Matteucci. 



" 14. Gottingen. Gatterer. Prague. Strnad. 



" 14. Eochelle. Seignette. 



" 14. Paris. Cassini. Padua. Toaldo. 



" 15. Cambridge. Wigglesworth. Lovering. 



" 15. Cambridge. Williams. 



" 15. Eochelle. Seignette. 



" 16. Cambridge. Wigglesworth. Lovering. 



" 16. Cambridge. Williams. 



" 16. Salem. Holyoke. Lovering. 



" 16. Paris. Cassini. Kendal. Dalton. 



" 17. Cambridge. Williams. Kendal. Dalton. 



" 17. Salem. Holyoke. Lovering. 



" 17. Eochelle. Seignette. 



" 17. Stockholm. Nicander. Borne. Calandrelli. 



" 18. Paris. Cassini. Kendal. Dalton. 



" 19. New Haven. Stiles. Loomis. 



" 19. Paris. Cassini. Erfurt. Planer. 



" 21. Mannheim. Hemmer. 



" 25. Montmorenci. Cotte. 



" 29. Eochelle. Seignette. 



June 2. New Haven. Stiles. Loomis. 



" 5. Eochelle. Seignette. 



" 6. Prague. Strnad. 



" 7. Kendal. Dalton. Eochelle. Seignette. 



" 8. Cambridge. Williams. Paris. Cassini. 



" 8. Salem. Holyoke. Lovering. 



" 9. Cambridge. Wigglesworth. Lovering. 



" 9. Cambridge. Williams. 



" 9. Salem. Holyoke. Lovering. 



" 9. New Haven. Stiles. Loomis. 



" 10. Cambridge. Wigglesworth. Lovering. 



" 10. Cambridge. Williams. 



" 10. Montmorenci. Cotte. 



1 An anrora was seen in Spain one day in this month. Mem. 

 Acad. Cienc. Madrid. III. 77. 



