26 



ON THE PERIODICITY OF THE AURORA BOREALIS. 



1718. 

 Frobes and Mairan. 



Sweden. Celsius. Frobes and Mairan. 

 Berlin. Kirch. Maraldi and Pilgram. 

 Sweden. Celsius. Frobes and Mairan. 

 Frobes and Mairan. 



Sweden. Celsius. Frobes and Mairan. 

 Berlin. Kirch. Mairan. 

 Frobes and Mairan. 

 Frobes and Mairan. 

 Frobes and Mairan. 

 Berlin. Kirch. Mairan. 

 Frobes and Mairan. 

 Frobes and Mairan. 



Sweden. Celsius. Frobes and Mairan. 

 Lynn. Folk.es. 1 

 Sweden. Celsius. Frobes. 

 Mairan, Maraldi, Pilgram, and Short. 

 Lynn. Folkes. Mairan 2 and Phil. Trans. 

 Lynn. Folkes. 



Mairan, Pilgram, and Phil. Trans. 

 Lynn. Folkes. 



Mairan, Pilgram, and Phil. Trans. 

 Sweden. Celsius. Frobes and Mairan. 

 Lynn. Folkes. 



Mairan, Pilgram, and Phil. Trans. 

 Paris. De la Hire. 3 

 Sweden. Celsius. Frobes and Mairan. 

 Frobes and Mairan. 

 Mairan 4 and Pilgram. 

 Phil. Trans. Mairan. 

 Frobes and Mairan. 



Sweden. Celsius. Frobes and Mairan. 

 Phil. Trans. Mairan. 

 Sweden. Celsius. Frobes and Mairan. 

 Pilgram and Phil. Trans. 

 Frobes and Mairan. 



1719. 

 Berlin. Kirch. Mairan. 

 Mairan and Pilgram. 5 

 Frobes and Mairan. 

 Frobes and Mairan. 

 Frobes and Mairan. 

 Lynn. Folkes. Pilgram. 



J Phil. Trans., XXXII. 300. 



2 Traits, &c, p. 206. 



8 Me'moires de l'Acad., 1718, p. 286. 



4 Me'moires de l'Acad. 6 Ibid. 



Mar. 23. Mairan and Phil. Trans. 



" 25. Mairan and Pilgram. 1 



" 30. Paris. Maraldi. 2 



" 30. Frobes, Mairan, and Phil. Trans. 3 



April 7. Lynn. Folkes. Pilgram and Phil. Trans. 4 



" 9. Frobes and Mairan. 



" 10. Frobes and Mairan. 



" 18. Frobes and Mairan. 5 



Sept. 22. Mairan and Short. 



" 24. Mairan and Short. 



" 25. Frobes and Mairan. 



Oct. 16. Berlin. Kirch. Celsius and Mairan. 



" 22. Short and Mairan. 



" 23. Balk. Thibes. Boue. 6 



" 27. Frobes and Mairan. 



" 30. Frobes and Mairan. 



Nov. x. Frobes and Mairan. 



" 3. Reichstatt. Rost. Boue. 



" 6. Lynn. Folkes. Devonshire. Maunder. 7 



" 6. Pilgram and Short. 



" 13. Berlin. Kirch. Celsius and Mairan. 



" 14. Frobes and Mairan. 



" 17. Frobes and Mairan. 



" 20. Lynn. Folkes. 



" 20. Celsius, Pilgram, and Phil. Trans. 



" 21. Dublin, Ireland? Short. Mairan. 



" 21. New England? 



" 21. London. Halley. 10 Pilgram. 



" 22. Frobes and Mairan. 



" 24. Frobes and Mairan. 



Dec. 1. Frobes and Mairan. 



" 5. Dublin. Mairan. Pilgram and Phil. Trans. 



" 7. Short. Mairan. 



" 22. Streatham. Hearne. 11 



" 22. New England} 2 Salem. Felt. 



" 23. Streatham. Hearne. 



« 30. Short. Mairan. 



1720. 

 Jan. 1. Sweden. Celsius. Frobes and Mairan. 

 " 2. Berlin. Kirch. Mairan. 



1 Me'moires de l'Acad. 



2 Boue refers to Montauban, with a query, for March 29. 



8 Me'moires de l'Acad., 1719. 4 Ibid. 

 6 Boue' quotes Bertholon for April 17. 



6 Breslau Coll., 1719, II. 581. 



1 Phil. Trans., XXX. 1101. B Ibid., p. 1104. 



9 Mass. Coll., II. 17. 



W Phil. Trans., XXX. 1099. u Ibid., p. 1107. 



w Mass. Coll., II. 17-20. 



