246 



ON THE PERIODICITY OF THE AURORA BOREALIS. 



1721. 



• (i 



• i' 



• ti 



• ii 



• it 



• ii 



• ii 



• t! 



• II 



• II 



• II 



• II 



• II 



• II 



• II 



•1722. 



• ii 



* 

 * 

 * 



* 

 * 

 * 



* 



* 



Oct. 



Nov, 

 Jan. 



Feb. 



Jan. 1. 

 Feb. 17. 

 " 17. 

 " 23. 

 " 23. 

 " 28. 

 « 28. 

 March 1. 

 " 12. 

 « 12. 

 " 29. 

 3. 

 23. 

 24. 

 31. 

 1. 

 22. 

 23. 

 25. 

 23. 

 24. 

 27. 

 March 17. 

 " 18. 

 « 27. 

 April 5. 

 May 23. 

 June 4. 

 Sept. 16. 

 « 17. 

 " 18. 

 Oct. 14. 

 « 19. 

 " UO. 

 21. 

 " 25. 

 26. 

 Nov. 14. 

 " 22. 

 23. 

 " 24. 



Heis. 1 



France. Maraldi, Reuss. 

 Germany. Liebknecht. 2 

 France. Maraldi. 

 Germany. Leibknecht. 

 France. Miraldi, Heis. 

 Germany. Liebknecht. 

 Mark. Beckmann. 



Germany. Kulm, etc. 



Wittemberg. Hallmann. 8 

 Stuttgart. Frobes. 4 



Magdburg, Nuremberg. Rost. 

 Liitzen? Dresden, Poland. 

 Liitzen, Dresden, Poland. 



Nuremberg. 



Magdburg, Nuremberg. Rost. 



Nuremberg. Rost. 6 



Nuremberg. Rost. 



Nuremberg and Breslau. 



Seehausen. Siegesbeck. 6 



Seehausen. Siegesbeck. 



Seehausen. Siegesbeck. 



Angerburg. Frobes. 



Breslau. Frobes. 



Nuremberg. Rost ? 



Seehausen, Dresden. Frobes. 



Lobau. Frobes. 



Jauer. Frobes. 



Saxony. Frobes. 



Seehausen. Siegesbeck. Saxony 



Seehausen. Siegesbeck. 



Seehausen. Siegesbeck. Dresden 



Seehausen. Siegesbeck. 



Seehausen. Siegesbeck. 



Seehausen. Siegesbeck. 



Seehausen. Siegesbeck. 



Seehausen. Siegesbeck. 



Seehausen. Siegesbeck. 



Giessen. Liebknecht.' 



Sept. 



Oct. 

 Dec. 



Jan. 



Dresden. 

 Dresden. 



Frobes. 

 Frobes. 



1 Wochenscrift fur Astronomie, Meteorologie, etc., Neue 

 Folge, II. 294. 

 j Acta Erudit. Leipsic. 1721, p. 157, etc. 

 SGott. Gelehr. Zeit. 1721 pp. 710-33. 

 * Acta Uratislav. 1721, p. 177, 302, etc. 

 5 Luzinensibus, or inhabitants of Liitzen. 

 8 Acta Uratislav. 1722, Pt. I. p. 49, etc. 

 ' Novellae Litter. Lips. 1723, p. 220. 



*1722. Dec. 3. Dantzig. Kulm. 



* " '•' 12. Dresden. Frobes. 



" 15. Seehausen. Siegesbeck. 



" 31. Tilgram. 



Jan. 12. Nuremberg. 



" 14. Seehausen. Siegesbeck. 



" 17. Portugal. Frobes. 1 



March 10. Giessen. Frobes. 2 



" 21. Breslau. Frobes. 



7. Jauer. Frobes. 

 12. Jauer. Frobes. 

 28. Jauer. Frobes. 

 31. Lusatia, Saxony. Frobes. 

 18. Jauer. Frobes. 

 17. Germany, Poland, Italy, France.' 



" 29. Germany, Poland. Italy, France. 



" 30. Germany, Poland, Italy, France. 



March 24. Germany, Poland, Italy, France. 



May 4. Germany, Poland. Italy, France. 



" 22. Germany, Poland, Italy, France. 



4. Germany, Poland, Italy, France. 

 12. Germany, Poland, Italy, France. 

 17. Germany, Poland, Italy, France. 



24. Germany, Poland, Italy, France. 

 31. Germany, Poland. Italy, France. 



9. Germany, Poland. Italy, France. 



22. Germany, Poland, Italy. France. 



23. Germany, Poland, Italy, Franc*. 



25. Germany, Poland, Italy, France. 



8. Tornea. Burman. 



8. Germany. Frobes. 



9. Germany. Frobes. 



1 2. Germany. Frobes. 



13. Germany. Frobes. 



6. Upsal. Burman. 4 

 9. Upsal. Burman. 



31. Upsal. Burman. 



5. Germany. Frobes. 



7. Germany. Frobes. 



8. Germany. Frobes. 



9. Germany. Frobes. 



5. Germany. Frobes. 



6. Germany. Frobes. 

 " " 7. Germany. Frobes. 



1 Uratislav. 1723, p. 71, and Suppl. II. 57. This aurora it noi 

 given by Mairan. Perhaps it was a meteor. 



2 Novellae Litter. Lips. 1723, p. 220. 



3 Acta Uratislav. 1724, p. 70, etc. 

 * Acta. Lit. Sueciae, II. 141. 



* ii 



* ii 

 *1723. 



* ii 



* ii 



* ii 



* ii 



* ii 



* a 



* ii 



* ii 



* ii 



* ii 



* ii 



* ii 



* ii 



* ii 



* ii 



* a 



* a 



* ii 



* ii 



* ii 



* ii 



* ii 



*1725. 



* ii 



* 



Aug. 



Sept. 



Dec. 

 Jan. 



Feb. 



Oct. 



Dec. 



