88 



ON THE PERIODICITY OF THE AURORA BOREALIS. 



May 6. 

 7. 



" 10. 



" 11. 



« 24 



" 24. 



" 24. 



" 24. 



" 25. 



" 25. 



" 25. 



" 25. 



" 25. 



" 25. 



" 26. 



" 27. 



" 28. 



" 29. 



« 30. 



" 31. 



" 31. 

 June 2 3. 



" 4. 



" 5. 



" 9. 



« 25. 



" 27. 



" 28. 

 July 1. 



" 2. 



" 2. 



" 3. 



" 5. 



" 14. 



" 15. 



" 25. 



" 25. 



" 30. 



" 30. 



" 30. 



" 30. 



" 30. 



" 31. 



" 31. 



" 31. 



Aug. 1. 



« 1. 



Moscow. 



Brussels. 



Brussels. 



Kendal. 



Kendal. 



Padua. 



Rtritter. 



Mann. 



Mann. 

 Dalton. 

 Dalton. 

 Toaldo. 



Kendal. Dalton. 



Geneva. Deluc. 

 Paris. Cassini. 



Dublin. Usher. 



Mannheim. Hemmer. 



Montmorenci. Cotte. 



Cambridge. Wigglesworth. Lovering. 



Salem. Holyoke. Lovering. 



New Haven. Stiles. Loomis. 



Mannheim. Hemmer. Paris. Cassini. 



Kendal. Dalton. Brussels. Mann. 



Dublin, Ireland. Usher. 1 



Ratisbon. Heinrich. Brussels. Mann. 



Kendal. Dalton. 



New Haven. Stiles. Loomis. 



Cambridge. "Wigglesworth. Lovering. 



Salem. Holyoke. Lovering. Kendal. Dalton. 



Cambridge. Wigglesworth. Lovering. 



Salem. Holyoke. Lovering. Jena. Zeissing. 



Kendal. Dalton. 



Padua. Toaldo and Chiminello. 



Brussels. Mann. 



Brussels. 

 Brussels. 

 Brussels. 

 Brussels. 

 Brussels. 

 Salem. 



Mann. 

 Mann. 

 Mann. 

 Mann. 

 Mann. 

 Holyoke. 



Jena. Zeissing. 



Lovering. 



Mannheim. Hemmer. 

 Paris. Cassini. 

 Jena. Zeissing. 

 Mannheim. Hemmer. 

 Ml. St. Gothard. P. L. of Milan. 

 Cambridge. Wigglesworth. Lovering. 

 Salem. Holyoke. Lovering. 

 Cambridge. Wigglesworth. Lovering. 

 Salem. Holyoke. Lovering. 

 New Haven. Stiles. Loomis. 

 Kendal. Dalton. Berne. Studer. 

 Ratisbon. Heinrich. Paris. Cassini. 

 Cambridge. Wigglesworth. Lovering. 

 Salem. Holyoke. Lovering. 

 Sagan ? Preus. Jena. Zeissing. 

 Cambridge. Wigglesworth. Lovering. 

 Salem. Holyoke. Lovering. 



1 Mem. Irish Acad. II. 189. 



2 An aurora was seen in Spain one day of this month. 

 Acad. Cienc. Madrid. III. 77. 



Mem. 



Aug. 1. New Haven. Stiles. Loomis. 



" 1. Kendal. Dalton. Rochelle. Seignette. 



" 2. Neio Haven. Stiles. Loomis. Kendal. Dalton. 



" 3. Kendal. Dalton. 



" 11. Mannheim. Hemmer. 



" 16. Stockholm. Nicander. 



" 19. Kendal. Dalton. Jena. Zeissing. 



" 19. Sagan. Preus. Stockholm. Nicander. 



" 20. Rome. Calandrelli. 



" 22. Spain. Rico. 



" 23. Cambridge. Wigglesworth. Lovering. 



" 23. Sale7>i. Holyoke. Lovering. 



" 23. New Haven. Stiles. Loomis. 



" 23. Mannheim. Hemmer. Rome. Calandrelli. 



" 23. Paris. Cassini. Kendal. Dalton. 



" 23. Montmorenci. Cotte. 



" 24. Mannheim. Hemmer. 



" 26. Cambridge. Wigglesworth. Lovering. 



" 26. Salem. Holyoke. Lovering. 



" 26. Neic Haven. Stiles. Loomis. 



" 27. Cambridge. Wigglesworth. Lovering. 



" 27. Salem. Holyoke. Lovering. Jena. Zeissing. 



" 27. New Haven. Stiles. Loomis. 



" 28. Cambridge. Wigglesworth. Lovering. 



" 28. Salem. Holyoke. Lovering. 



" 28. New Haven. Stiles. Loomis. 



" 28. Moscow. Stritter. Jena. Zeissing. 



" 28. Sagan ? Preus. Stockholm. Nicander. 



" 29. New Haven. Stiles. Loomis. 



" 29. Wiirzburg. Egel. Spain. Rico. 



" 29. Sagan ? Preus. Mannheim. Hemmer. 



" 29. Kendal. Dalton. Jena. Zeissing. 



" 31. New Haven. Stiles. Loomis. Sagan? Preus. 



Sept. 1. Sagan. Preus. Stockholm. Nicander. 



" 1. Brussels. Mann. 



" 2. Cambridge. Wigglesworth. Lovering. 



" 2. Salem. Holyoke. Lovering. 



" 2. New Haven. Stiles. Loomis. 



" 2. Kendal. Dalton. Geneva. Deluc. 



" 3. Cambridge. Wigglesworth. Lovering. 



' 3. Salem. Holyoke. Lovering. 



' 3. New Haven. Stiles. Loomis. 



' 3. Erfurt. Planer. Stockholm. Nicander 



1 3. Jena. Zeissing. St. Petersburg. Euler. 



' 4. Cambridge. Wigglesworth. Lovering. 



' 4. Salem. Holyoke. Lovering. 



' 4. New Haven. Stiles. Loomis. 



' 4. Paris. Cassini. 



' 4. Jena. Zeissing. St. Petersburg. Euler. 



' 4. Mannheim. Hemmer. Sagan. Preus. 



