ON THE PERIODICITY OF THE AURORA BOREALIS. 



87 



Dec. 9. New Haven. Stiles. Loomis. 



" 9. Paris. Cassini. Stockholm. Nicander. 



" 10. Mannheim. Hemmer. Sayan. Preus. 



" 13. Stockholm. Nicander. 



" 15. Sagan. Preus. 



" 16. Berne. Studer. 



" 18. Stockholm. Nicander. 



1788. 



Sagan. Preus. 



Mannnheim. Hemmer. 



Sagan ? Preus. 



Sagan ? Preus. 



Mannheim. Hemmer. Kendal. Dalton. 



Salem. Holyoke. Lovering. Kendal. Dalton. 



Stockholm. Nicander. Kendal. Dalton. 



Stockholm. Nicander. 



Kendal. Dalton. Nicander. 



Sagan ? Preus. Stockholm. Nicander. 



Cambridge. Wigglesworth. Lovering. 



Salem. Holyoke. Lovering. Kendal. Dalton. 



Kendal. Dalton. 



Stockholm. Nicander. 



Sagan. Preus. 



Berlin. Beguelin and Achard. 



Kendal. Dalton. Sagan "? Preus. 



Cambridge. Wigglesworth. Lovering. 



Salem. Holyoke. Lovering. 



New Haven. Stiles. Loomis. 



Keswick. Dalton. St. Petersburg. Euler. 1 



Keswick. Dalton. 



Stockholm. Nicander. Kendal. Dalton. 



Sagan. Preus. 



New Haven. Stiles. Loomis. 



Middleburg. Van de Perre. 



Stockholm. Nicander. Ratisbon. Heinrich. 



Mannheim. Hemmer. Brussels. Mann. 



TigurinaAedes. Magold. Spain. Rico. 2 



Sagan. Preus. Bochelle. Seignette. 



Munich. Huebpauer. Padua. Toaldo. 



Erfurt. Planer. Copenhagen. Bugge. 



Jena. Zeissing. Geneva. Deluc. 



Buda. Bruna. Berlin. Beguelin and Achard. 



Montmore/ici. Cotte. 



Sagan. Preus. Keszcick. Dalton. 



Pome. Calandrelli. Spain. Rico. 



Buda. Bruna. Erfurt. Planer. 



1 Nova Acta Sci. Acad. Petrop. VI. 338. 

 - Mem. Acad. Cienc. Madrid. III. 77. 



Feb. 15. 



" 22. 



Mar. 3. 



4. 



" 5. 

 6. 

 7. 



" 7. 



" 8. 



" 14. 



" 22. 



" 26. 



« 27. 



" 27. 



" 28. 



" 28. 



" 28. 



" 30*. 

 Apr. 1. 



" 1. 



" 1. 



" 1. 



« 2. 



" 3. 



" 4. 



" 6. 



" 6. 



" 7. 



" 8. 



« 9. 



" 10. 



" 14. 



" 21. 



" 24. 



" 26. 



" 27. 



" 27. 



" 28. 



" 29. 



" 29. 



" 29. 



" 29. 



" 30. 

 May 1. 



" 2. 



" 2. 



" 3. 



" 4. 

 5. 



Jena. Zeissing. Stockholm. Nicander. 



3/annheim. Hemmer. 



Spain. Rico. 



Stockholm. Nicander. 



Stockholm. Nicander. 



Stockholm. Nicander. 



Sagan. Preus. Kendal. Dalton. 



Borne. Calandrelli. 



Sagan ? Preus. Kendal. Dalton. 



Mannheim. Hemmer. Stockholm. Nicander. 



Mannheim. Hemmer. 



Stockholm. Nicander. 



Cambridge. Wigglesworth. Lovering. 



Stockholm. Nicander. Brussels. Mann. 



Cambridge. Wigglesworth. Lovering. 



Mannheim. Hemmer. Paris. Cassini. 2 



Kendal. Dalton. St. Petersburg. Euler. 



Stockholm. Nicander. 



Cambridge. AVigglesworth. Lovering. 



Sagan ? Preus. 

 Paris. Cassini. 

 Kendal. Dalton 

 Geneva. 

 Sagan ? 

 Brussels 

 Sagan. 



Deluc. 

 Preus. 

 Mann. 

 Preu 



Stockholm. Nicander. 

 Montmorenci. Cotte. 



Sagan. Preus. 

 Montmorenci. Cotte. 

 Kendal. Dalton. 



Stockholm. Nicander. 

 Copenhagen. Bugge. Jena. Zeissing. 

 Kendal. Dalton. 

 Stockholm. Nicander. 

 Stockholm. Nicander. 

 Batisbon ? Heinrich. 

 Kendal. Dalton. 

 Mannheim ? Hemmer. 

 Sagan. Preus. 

 Sagan. Preus. 



Sagan. Preus. Kendal. Dalton. 

 Stockholm. Nicander. Montmorenci. Cotte. 

 Kendal. Dalton. Brussels. Mann. 

 Cambridge. Wigglesworth. Lovering. 

 New Haven. Stiles. Loomis. 

 Kendal. Dalton. Paris. Cassini. 

 Stockholm. Nicander. Batisbon. Heinrich. 

 Paris. Cassini. Kendal. Dalton. 

 Kendal. Dalton. 

 Salem. Holyoke. Lovering. 

 Stockholm. Nicander. Paris. Cassini. 

 Brussels. Mann. 



New Haven. Stiles. Loomis. Kendal. Dalton. 

 Jena. Zeissing. 



» Mem. del' Acad. 1788. p. 72. 



