62 



OF THE PERIODICITY OF THE AURORA BOREALIS. 



Feb. 

 (c 



Mar. 

 a 



Apr. 



27. 



27. 



2. 



3. 



5. 



6. 



10. 



11. 



13. 



16. 



17. 



19. 



21. 



22. 



28. 



30. 



3. 



4. 



'• 12. 



" 12. 



« 14. 



" 15. 



'■ 20. 



« 22. 



" 25. 



« 29. 



June 14. 



" 21. 



July 5. 



5. 



« 7. 



8. 



" 25. 



" 25. 



'• 25. 



Aug. 31. 



Sept. 4. 



« 20. 



'• 25. 



27. 



2. 



Oct. 



2. 

 2. 

 5. 

 6. 

 14. 



Cambridge. Winthrop. Lovering. 

 Bradford, Mass. Williams. 

 Franeker. Cotte. 

 Franeker. Cotte. 

 Berlin. Beguelin. 

 Montmorenci. Cotte. 



Euler. 



Euler. 



Euler. 



Euler. 



Euler. 



Euler. 



Euler. 



Franeker. Cotte. 



Cotte. 



St. Petersburg. 



St. Petersburg. 



St. Petersburg. 



St. Petersburg. 



St. Petersburg. 



St. Petersburg. 



St. Petersburg. 



Berlin. Beguelin. 



Berlin. Beguelin. 



Berlin. Beguelin. 



Berlin. Beguelen. Franeker. 



St. Petersburg. Euler. 



Cambridge. Winthrop. Lovering. 



Bradford, Mass. "Williams. 



St. Petersburg. Euler. 



St. Petersburg. Euler. 



Berlin. Beguelin. 



St. Petersburg. Euler. 



Berlin. Beguelin. 



Franeker. Cotte. 



Marseilles. Cotte. 



Franeker. Cotte. 



Cambridge. Winthrop. Lovering. 



Bradford, Mass. "Williams. 



< 'ambridge. "Winthrop. Lovering. 



Cambridge. Winthrop. Lovering. 



Bradford, Mass. "Williams. 



Newport, R. 1. Stiles. Loomis. 



Cambridge. "Winthrop. Lovering. 



Bradford, 31ass. "Williams. 



Newport, R. I. Stiles. Loomis. 



Berlin. Beguelin. Montmorenci. 



Stockholm. Wilke. 1 



Berlin. Beguelin. 



Franeker. Cotte. 



Franeker. Cotte. Stockholm. "Wilke. 



Cambridge. Winthrop. Lovering. 



Bradford, Mass. Williams. 



Montmorenci. Brussels. Franeker. Cotte. 



St. Petersburg. Euler. Marseilles. Cotte. 



Brussels. Cotte. St. Petersburg. Euler. 



Marseilles. Cotte. 



Cotte. 



i Gilbert. Ann. XXIX. 420, 



1 Encyc. Method. I. 348. Journ. de Sav. 1773, p. 188. 



2 Kamtz. Lehrbucb der Met. III. 465. 



