90 



ON THE PERIODICITY OF THE AURORA BOREALIS. 



1789. 



« 

 u 



Jan. 11. 



" 13. 



" 19. 



" 21. 



" 24. 



" 29. 



" 30. 

 Feb. 2. 



" 6. 



" 15. 



" 15. 



" 15. 



" 16. 



" 17. 



" 23. 



" 23. 

 26. 

 26. 



" 26. 



" 28. 

 Mar. 2. 



" 3. 



« 4. 



« 14. 



" 14. 



» 14. 



" 14. 



» 16. 



•■ 17. 



" 20. 



" 22. 



" 26. 



" 26. 



" 27. 



" 27. 



" 27. 



" 27. 



" 27. 



" 27. 



" 27. 



« 27. 



« 27. 



" 27. 



" 28. 



" 28. 



" 28. 



Kendal. Dalton. 



Stockholm. Nicander. 



Stockholm. Nicander. 



Sagan. Preus. 



Mannheim. Hemmer. 



Sagan ? Preus. 



Sagan. Preus. Stockholm. Nicander. 



Sagan. Preus. 



Mannheim. Hemmer. Stockholm. Nicander. 



<Sif. Petersburg. Euler. 



Cambridge. Wigglesworth. Lovering. 



New Haven. Stiles. Loomis. Berne. Studer. 



Stockholm. Nicander. Keswick. Dalton. 



Salem. Holyoke. Lovering. 



Stockholm. Nicander. 



Sagan. Preus. Kendal. Dalton. 



Stockholm. Nicander. 



Cambridge. "Wigglesworth. Lovering. 



Salem. Holyoke. Lovering. 



Mannheim. Hemmer. Kendal. Dalton. 



Nicander. Kendal. Dalton. 



Nicander. 



Nicander. Moscow. 



Nicander. Moscow. 



Stritter. 

 Stritter. 



Wigglesworth. Lovering. 



Stockholm. 



Stockholm. 



Stockholm. 



Stockholm. 



Cambridge. 



Salem. Holyoke. Lovering. 



Kendal. Dalton. Spain. Rico. 



Brussels. Mann. Paris. Cassini. 1 



Stockholm. Nicander. Kendal. Dalton. 



Stockholm. Nicander. 



Mannheim. Hemmer. 



Sagan ? Preus. 



Cambridge. Wigglesworth. Lovering. 



Salem. Holyoke. Lovering. 



Cambridge. Wigglesworth. Lovering. 



Salem. Holyoke. Lovering. 



New Haven. Stiles. Loomis. 



Geneva. Senebier. Deluc. Berne. Studer. 



Brussels. Mann. Paris. Cassini. 



Stockholm. Nicander. Ratisbon. Heinrich. 



Marseilles. St. Jacques. Buda. Bruna. 



Mannheim. Hemmer. Rome. Calandrelli. 



Jena. Zeissing. St. Petersburg. Euler. 3 



Muntmoreuci. Cotte. Sutz. Spriingli. 



Ratisbon. Heinrich. Brussels. Mann. 



Sagan. Preus. Rochelle. Seignette. 



Sutz. Spriingli. Berne. Studer. 



1 Mem. de l'Acad. 1789. 



2 Nova. Acta. Sci. Acad. Petrop. VII. 407 



Mar. 28. 



" 29. 



" 29. 



« 29. 



" 29. 



" 30. 



" 30. 



" 31. 

 Apr. 1. 



" 2. 



" 9. 



" 11. 



" 12. 



" 13. 



" 15. 



" 17. 



" 17. 



" 18. 



" 20. 



" 26. 



" 26. 



" 26. 



" 26. 



« 27. 



" 27. 



" 29. 



" 30. 

 May 15. 



" 16. 



" 17. 



" 20. 



" 21. 



" 21. 



" 21. 



" 22. 



" 22. 



" 22. 



" 23. 



" 23. 



" 23. 



" 23. 



" 24. 



" 24. 



" 24. 



" 28. 



" 28. 



" 28. 



" 28. 



« 29. 



" 31. 



Mannheim. Hemmer. St. Petersburg. Euler. 



Salem. Holyoke. Lovering. 



Kendal. Dalton. 



Brussels. Mann. Berlin. Achard. 



Sagan. Preus. Marseilles. St. Jacques. 



Berlin. Achard. Sagan. Preus. 



Brussels. Mann. Kendal. Dalton. 



New Haven. Stiles. Loomis. Sagan ? Preus. 



Stockholm. Nicander. 

 St. Petersburg. Euler. 

 Moscow. Stritter. 

 Stockholm. Nicander. 



Brussels. Mann. 



Stockholm. 



Stockholm. 



Stockholm. 



Cambridge. 



Stockholm. 



Stockholm. 



Nicander. 

 Nicander. 

 Nicander. 



Wigglesworth. 



Kendal. 

 Kendal. 



Dalton. 

 Dalton. 



Nicander. 

 Nicander- 



Lovering. 

 Brussels. Mann. 



Sagan ? Preus. Stockholm. Nicander. 



Cambridge. Wigglesworth. Lovering. 



Salem. Holyoke. Lovering. 



New Haven. Stiles. Loomis. 



Stockholm. Nicander. Laon. Cotte. 



Cambridge. Wigglesworth. Lovering. 



Salem. Holyoke. Lovering. Sagan ? Preus. 



Mannheim. Hemmer. Sagan? Preus. 



Kendal. Dalton. 



Brussels. Mann. 



Brussels. Mann. 



Mannheim. Hemmer. 



Salem. Holyoke. Lovering. 



Cambridge. Wigglesworth. Lovering. 



Salem. Holyoke. Lovering. 



New Haven. Stiles. Loomis. 



Cambridge. Wigglesworth. Lovering. 



Salem. Holyoke. Lovering. 



New Haven. Stiles. Loomis. 



Cambridge. Wigglesworth. Lovering. 



Salem. Holyoke. Lovering. 



New Haven. Stiles. Loomis. 



Ratisbon. Heinrich. Paris. Cassini. 



Cambridge. Wigglesworth. Lovering. 



Salem. Holyoke. Lovering. 



Rome. Calandrelli. 



Cambridge. Wigglesworth. Lovering. 



Salem. Holyoke. Lovering. 



New Haven. Stiles. Loomis. 



Brussels. Mann. 



Brussels. Mann. 



New Haven. Stiles. Loomis. Sagan. Preus. 



