GO 



OF THE PERIODICITY OF THE AURORA BOREALIS. 



Aug. 5. Cambridge. Winthrop. Lovering. 



Sept. 9. Oxford. Swinton. 1 Keuss. 



" 23. St. Petersburg. Euler. 2 



" 26. Cambridge. Winthrop. Lovering. Pilgram. 



Oct. 7. Cambridge. "Winthrop. Lovering. 



" 7. Newport, R. I. Stiles. 



" 8. St Petersburg. Euler, 



" 23. Cambridge. "Winthrop. 



" 23. Newport, R. I. Stiles. 



" 24. Berlin. Beguelin. Rheims. Lavoisier. Reuss. 8 



" 24. Newport, R. 1. Stiles. Loomis. 



" 24. St. Petersburg. Euler. 



" 24. Havre. Dicquemare. 4 



" 25. Cambridge. "Winthrop 



" '25. Newport, R. I. Stiles. 



" 25. Havre. Dicquemare. 



" 26. Cambridge. Winthrop. 



" 26. St. Petersburg. Euler. 



" 27. Havre. Dicquemare. 



" 27. Cambridge. Winthrop. 



" 27. St. Petersburg. Euler. 



" x. Beziers. Bertholon. 5 



" x. Beziers. Bertholon. 



Nov. 1. St. Petersburg. Euler. 



" 3. Berlin. Beguelin. 



" 17. St. Petersburg. Euler. 



" 23. St. Petersburg. Euler. 



Dec. 2. St. Petersburg. Euler. 



" 4. St. Petersburg. Euler 



" 6. Cambridge. Winthrop. 



1770. 



Loomis. 



Lovering. 

 Loomis. 



Pilgram. 



Lovering. 

 Loomis. 



. Lovering. 

 Havre. Dicquemare. 



Lovering. 



Lovering. 



Berlin. Beguelin. 



Lovering. 

 Loomis. 



Lovering, 



Loomis. 



Berlin. 



Beguelin. 



Berlin. Beguelin. 



Berlin. Beguelin. 



Jan. 17. Cambridge. Winthrop. Lovering. 



" 17. Newport, R. I. Stiles. Loomis. 



" 17. Berlin. Beguelin. 6 



" 18. Cambridge. Winthrop. Lovering. 



" 18. Berlin. Beguelin. Christiania. Hansteen. 7 



" 18. Newport, R. I. Stiles. Loomis. 



" 18. Jena. Zeissing. 8 Beziers. Bertholon. 



" 18. Cadiz, Rome, Vienna, §c. Pilgram. 



" 18. Spain. Nifo. Rico. 9 



» Phil. Trans. LIX. 369. 

 2 N. Comm. Petrop. XIV. 636. 



8 Journ. de Phys. IX. 279. Mem. de l'Acad. 1769, p. 22. 

 Also Mem. de l'Acad. Berlin, 1769, p. 163. 

 * Journ. de Phys. IX. 279. 

 6 Encyc. Method. I. 365. 

 6 Mem. de l'Acad. Berlin, 1770, p. 93. 

 ' Gilbert. Ann. LXVII. 48. 



8 Gilbert. Ann. XV. 208. 



9 Mem. Acad. Cienc. Madrid, IIL 77. 



Feb. 1. Berlin. Beguelin. 

 " 12. Berlin. Beguelin. 

 " 13. St. Petersburg. Euler. 1 

 " 15. Berlin. Beguelin. 

 " 18. Berlin. Beguelin. 

 " 25. St. Petersburg. Euler. 

 " 27. St. Petersburg. Euler. 

 " 28. Cambridge. Winthrop. 

 " 28. Newport, R. I. Stiles. 

 " 28. St. Petersburg. Euler. 

 Mar. 2. St. Petersburg. Euler. 

 " 14. Berlin. Beguelin. 

 " 18. Berlin. Beguelin. 

 " 23. Cambridge. Winthrop. 

 " 23. Newport, R. I. Stiles. 

 " 23. St. Petersburg. Euler. 

 " 26. Berlin. Beguelin. 

 " 27. St. Petersburg. Euler. 

 " 29. Jena. Zeissing. 

 Apr. 12. St. Petersburg. Euler. 

 " 13. St. Petersburg. Euler. 



" 14. Berlin. Beguelin. 



" 15. St. Petersburg. Euler. 



" 17. Berlin. Beguelin. 



" 19. Cambridge. Winthrop. 



" 19. Berlin. Beguelin. 



" 20. Berlin. Beguelin. 

 May 16. Cambridge. Winthrop. 



" 27. Berlin. Beguelin. 

 July 14. Cambridge. Winthrop. 



" 16. Cambridge. Winthrop. 



" 27. Cambridge. Winthrop. 



" 31. Cambridge. Winthrop. 

 Aug. 1. Litbeck. Behn. Boue\ 2 



" 8. Jena. Zeissing. 



" 10. Jena. Zeissing. 



" 27. Cambridge. Winthrop. Lovering. 



" 31. Cambridge. Winthrop. Lovering. 



" 31. Jena. Zeissing. Beziers. Bertholon. 



" 31. Gottingen. Boue. 3 

 Sept. 9. Cambridge. Winthrop. Lovering. 



" 9. Berlin. Beguelin. 



" 16. Cambridge. Winthrop. Lovering. 



" 17. Montmorenci. Cotte. 



" 17. Pekin. Amiot. 4 Lubeck. Behn. Boue. 

 Oct. 26. St. Petersburg. Euler. 



i N. Comm. Petrop. XV. 682. 

 2 Sitz. Bericht. Wien. XLV. 442. 

 8 Hannov. Mag. 1770, p. 1217. 

 * Kamtz. Lekrbach der Met. III. 465. 



Lovering. 



Lovering. 



Lovering. 

 Lovering. 

 Lovering. 

 Lovering. 



