32 



ON THE PERIODICITY OF THE AURORA BOKEALIS. 



Plymouth, Eihj. Huxham. 1 Short. 



St. Petersburg. Kraft. Tbe Delisles, Mairan. 



St. Petersburg. Kraft. The Delisles. 



Sweden. Celsius. Frobea ami Mairan. 



Sweden. Celsius. Frobes and Mairan. 



Utrecht. Musschenbroek. Mairan. 



Celsius, Frobes, and Pilgram. 



Frobes and Mairan. 



St. Petersburg. Kraft. The Delisles. 



Frobes and Mairan. 



Sweden. Celsius, Frobes, and Mairan. 



I F psaL Burman. 2 



Frobes and Mairan. 



Utrecht. Musschenbroek. 



Madras and Pilgram. 



Bologna. Zanotti. Mairan. 



Mairan and Phil. Trans. 



St. Petersburg. Kraft. The Delisles. Short. 



Berlin. Kirch. Utrecht. Musschenbroek. 



Plymouth. Huxham. Ituly. Zanotti. 



Celsius, Frobes, Mairan, and Pilgram. 



St. Petersburg. Kraft. The Delisles. 



Plymouth. Huxham. Short. 



Sweden. Celsius. Frobes and Mairan. 



Frobes, Mairan, and Phil. Trans. 



Sweden. Celsius. Frobes and Mairan. 



Utrecht. Musschenbroek. 



Italy. Beccari. Mairan and Pilgram. 



Utrecht. Musschenbroek. 



Mairan and Pilgram. 



Mairan and Phil. Trans. 



St. Petersburg. Kraft. The Delisles, Mairan. 



Berlin. Kirch. Mairan. 



Italy. Beccari. Mairan. 



Frobes and Mairan. 



Berlin. Kirch. Celsius and Frobes. 



Mairan. Pilgram. 



Mairau and Phil. Trans. 



Mairan. Pilgram. 



Italy. Beccari. Berlin. Kirch. 

 Plymouth. Huxham. Phil. Trans. 



Mairan. Pilgram. 



Plymouth. Huxham. 



Pilgram. 



Plymouth. Huxham. Mairan. 



Phil. Trans, and Pilgram. 



St. Petersburg. Kraft. The Delisles, Mairan. 



l Anier. Journ., XXXIII. 298. 

 4 Acta Lit. Saecise, II. 513. 



Sept, 



Aug. 27. 

 " 28. 

 " 28. 

 " 29. 

 « 29. 

 " 30. 

 " 30. 

 " 31. 

 " 31. 

 « 31. 

 1. 

 5. 

 6. 

 7. 

 13. 

 15. 

 21. 

 26. 

 26. 

 27. 

 27. 

 28. 

 29. 

 29. 

 30. 

 30. 

 30. 

 2. 

 2. 

 2. 

 -2. 



3. 



4. 



5. 



6. 



7. 



7. 



7. 



8. 

 11. 

 11. 

 12. 

 12. 

 12. 

 12. 

 13. 

 14. 



Oct. 



Kilduin. Croyere. 

 Plymouth. Huxham. 

 Sweden. Celsius. Frobes and Mairan. 

 Plymouth. Huxham. Short and Mairan. 

 I yw//. Burman. Cel-ius, Frobes, and Pilgram. 

 Berlin. Kirch. Mairan. 

 Siceden. Celsiu*. Frobes. 

 Utrecht. Musschenbroek. 

 Upsal. Burman. Celsius. 

 Frobes, Mairan, and Pilgram. 

 Kilduin. Croyere. 



Upsal. Burman. Frobes and Mairan. 

 Trans. 



Frobes and Mairan. 

 Frobes and Mairan. 



Mairan and Phil. 

 Sweden. Celsius 

 Ujisal. Burman. 



Pilgram. 



Cola. Croyere. 



The Delisles. 

 Kirch. Mairan. 

 Mairan. 



St. Petersburg. Kraft. 



Italy. Beccari. Berlin. 



St. Petersburg. Maier. 1 



Frobes and Pilgram. 



St. Petersburg. Kraft. The Delisles. 



Siceden. Celsius. Frobes. 



Mairan and Phil. Trans. 



Utrecht. Musschenbroek. 



Sweden. Celsius. Frobes. 



Mairan, Pilgram, and Phil. Trans. 



Italy. Beccari. Berlin. Kirch. Mairan. 



Zurich. Seheuchzer. 2 Mairan. 



Siceden. Celsius. Frobes. 



Phil. Trans, and Pilgram. 



Cola. Croyere. 



Frobes and Mairan. 



Mairaq and Phil. Trans. 



Cola. Croyere. 



St. Petersburg. Kraft. The Delisles. 



Utrecht. Musschenbroek. 



Mairan. Frobes and Pilgram. 



St. Petersburg. Kraft. The Delisles. 

 St. Petersburg. Kraft. The Delisles. 

 Sweden. Celsius. Frobes and Mairan. 

 Plymouth. Huxham. 



Utrecht. Musschenbroek. 



Mairan. Upsal. Burman. Celsius. 



Frobes, Short, and Pilgram. 



Salem. Felt. 

 Celsius and Mairan. 



i Coram. Petrop., IV. 181. 



2 Acta Acad. Nat. Curios., II. 51, Appendix. 



