ON THE PERIODICITY OF THE AURORA BOREALIS. 



28. 



Dec. 



Sept. or Oct. 

 Feb 



1704. 

 Frobes and Mairan. 



170G. 

 Barret. 1 



Mar. 



Aug. 

 a 



Oct. 



u 



Nov. 



Aug. 



Sept. 



a 



Oct. 



Nov. 



Dec. 



Sept. 



Nov. 



(t 



Dec. 

 Mar. 

 Oct. 



1. 



2. 

 12. 



1. 



6. 

 17. 

 18. 

 20. 

 81. 

 16. 

 18. 

 21. 

 27. 

 29. 

 24. 

 27. 

 27. 



20. 

 21. 

 15. 

 22. 



18. 



x. 



19. 



17. 

 26. 

 2G. 



7. 



1707. 

 Copenhagen. Roemer. 

 Copenhagen. Roemer. 

 Frobes ami Mairan. 

 Copenhagen. Roemer. 3 

 Berlin. Kirch. 4 Seliomherg, 

 Frobes and Mairan. 

 Frobes and Mairan. 

 Frobes and Mairan. 

 Upminster. Derbam 

 Frobes and Mairan. 

 Frobes and Mairan. 

 Berlin. Kircb. Mairan. 

 Frobes and Mairan. 

 Berlin. Kirch. Mairan. 

 Frobes and Mairan. 

 Berlin. Kirch. Ireland. 

 Mairan and Thompson. 



1708. 

 London. Halley. 8 Mairan. 

 London. Halley. 9 

 North Sea, 66° Lat. 

 Frobes and Mairan 



Mairan. 2 

 Boue. 



Mairan. 



Seidelius. 5 



Ireland. Neve. 6 



Neve. ! 



Mairan. 10 



1709. 

 Frobes and Mairan. 

 Frobes and Mairan. 

 Frobes and Mairan. 



1710. 

 Paris, Vienna, and Peh'n. 11 

 Giessen. Liebknecbt. Mairan. 12 

 Leipsic. Pilgram. 

 Frobes and Mairan. 



1711. 

 x. Giessen. Pilgram. 

 1714. 

 Frobes and Mairan. 



i:> 



i Phil. Trans., XXVI. 310. 



2 Miscell. Berolin., I. 127 - 131. 



4 Ibid., 132. 



6 Phil. Trans., XXVI 310. 



8 Phil. Trans., XXIX. 419. 



w Bruyn's Voyages, V. 299. 



11 Boue quotes Frolics. 



« Acta Erud., 1711. 



Frobes and Mairan. 



8 Ibid., 131. 

 6 Ibid., 129. 

 ■ Ibid. 



9 Ibid. 



Mar. 15. 



" 17. 



" 17. 



" 17. 



" 17. 

 April 1 1 . 



" 11. 



" 12. 



" 12. 



" 13. 



" 13. 



" 20. 



May 1. 



2. 



" 3. 



4. 



5. 



Dec. 15. 



" 15. 



" 16. 



" 16. 



Jan. 6. 

 " 9. 

 " 10. 

 " 11. 

 Feb. 2. 

 " 16. 

 April 6. 

 " 9. 

 " 10. 

 " 10. 

 " 10. 

 " 11. 

 10. 

 21. 

 31. 

 8. 

 11. 

 20. 

 1. 



1716. 

 Pilgram. 



Aus 



Sept. 



Oct. 



Berlin. Kirch. London. Halley. 1 

 Cambridge, Eng. Cotes.' 



Sweden. Celsius. Frobes. 



Brest and Rouen. Mairan. 



Berlin. Kirch. Paris. Maraldi. Mairan. 



Frobes, Pilgram, and Phil. Trans. 



Berlin. Kirch. Paris. Maraldi. 



Frobes, Mairan, Pilgram, and Phil. Trans. 



Paris. Maraldi." 



Frobes, Mairan, Pilgram, and Phil. Trans. 



Giessen. Liebknecbt. 4 



Frobes and Mairan. 



Frobes and Mairan. 



Frolics and Mairan. 



Frobes and Mairan. 



Frobes and Mairan. 



Paris. Maraldi. 5 Frobes. 



Mairan, Pilgram, and Reuss. 



Paris. Maraldi. 



Frobes, Mairan, and Pilgram." 



Paris. 

 Paris. 

 Paris. 

 Paris. 

 Berlin. 

 Kent. 



1717 

 Maraldi. 

 Maraldi. 

 Maraldi. 

 Maraldi. 

 Kirch. 



Mairan and Pilgram. 

 Mairan and Pilgram. 

 Mairan and Pilgram. 

 Mairan and Pilgram. 

 Mairan. 



Barrell. Short. 7 

 Frobes and Mairan. 

 Frobes and Mairan. 

 Berlin. Kirch. London. Folkes. 

 Kent. Barrell. 8 



Celsius, Frobes, Mairan, and Short. 

 Frobes and Mairan. 

 Celsius and Mairan. 

 Frobes and Mairan. 

 Berlin. Kirch. Mairan. 

 Berlin. Kirch. Mairan. 

 Celsius and Mairan. 



Pilgram. 



Upsal. Burman. Frobes and Mairan.' 



i Phil. Trans., XXIX. 406, 407. 



2 Phil. Trans., XXX. 66. 



3 Mairan, p. 206. 



* Acad. Nat. Curios., 1719, 153. 



6 Memoircs de l'Aiad , 1717. 6 Ibid. 



' Phil. Trans., XXX. 584. 8 Ibid. 



9 Acta Lit. Succioc, II. 566; also Phil. Trans., XXXIII. 175. 



VOL. X. 



