22 



ON THE PERIODICITY OF THE AURORA BOREALIS. 



Frobes, Mairan, and Acad. Coll. 

 Kirch, Mairan, and Acad. Coll. 

 Kirch, Mairan, and Acad. Coll. 

 Kirch, Mairan, and Acad. Coll. 

 Kirch, Mairan, and Acad. Coll. 

 Kirch, Mairan, and Acad. Coll. 

 Kirch, Mairan, and Acad. Coll. 

 Kirch, Mairan, and Acad. Coll. 

 Kirch, Mairan, ami Acad. Coll. 

 Schmidt, Lehmann, F., M., A. C. 

 Schmidt, Frobes, Mairan, and Acad. 

 Zurich. Wagner, 1 Frobes, Mairan. 

 Zurich. Wagner, Frobes, Mairan, 

 Zurich. Wolf [Acad- Coll. 



Mayence. Serrarius. 2 Schmidt. F. 

 Paris? Mairan, Pilgram, and Acad. 

 Mni/ence. Serrarius. Pilgram. 

 Frobes, Mairan. and Acad. Coll. 

 Frobes, 5 Mairan, and Acad. Coll. 

 Serrarius, 6 Frobes, Mairan, Acad. 

 Kauffbeuren, Suabia. Bernegger. 

 Frobes, Mairan, 7 and Acad. Coll. 

 Leuwarden. Nihusius. Frobes. 

 Academy's Collection. 

 Kirch, Mairan, and Acad. Coll. 

 Kirch, Mairan, and Acad. Coll. 

 Basle. Wagner, F's., M. and A. C. 

 Paris. La Motte le Yayer, Mairan, 

 Acad. Coll. [and Pilgram. 



Kirch and Mairan. 

 Zurich. Wolf. JS T euchatel. s Pilgram. 

 Liebknecht, Frobes. Kirch, Mairan. 



France. Gassendi. 9 [Thompson. AC. 



Frobes, Mairan, 11 and Acad. Coll. 



Zurich.? Wolf. 



Kirch, Mairan, and Acad. Coll. 



Zurich. Wolf. 



Kirch, Mairan, and Acad. Coll. 



Kirch, Mairan, and Acad. Coll. 



1 E Suizeri Chron. Helvet., p. 123. 



2 Epistola: ad John Kepler, &c., p. 350. 



8 Journal du Regne de Henry IV. de P. de l'Etoile, II. 88. 

 * Mairan takes both these dales from Frobes unchanged. 

 6 Erobes quotes, " Le Mcrcure Franjois, &c., p. 82. 

 6 Acta Erudit. Leipsic, 1719, p. 8. 



' Mairan and Pilgram assign this aurora to Nov., 1607. 

 Traite' &c. p. 201. 



8 Bull, de l'Acad. Brux. V., 283. 



9 Oeuvres, II. 108. 



10 Mairan places this aurora on Sept. 21. Frobes intimates 

 that this and the preceding record refer to the same aurora. 



1623. Jan. 17. Kirch. Mairan, and Acad. Coll. 



" Feb. 18. Kirch, Mairan, and Acad. Coll. 



" May 13. Joachim, Bohemia. Frobes, M., A. C. 



" " 17. Lehmann. Frobes, Mairan. and 



" Nov. 17. Germany. Kepler. 1 [Acad. Coll. 



" Dec. 11. Kirch, Mairan, and Acad. Coll. 



1624. April 7. Joachim. Lehmann, F., M., A. C. 



" May 12. Anhah. Frobes, Mairan, Acad. Coll. 



" June 7. Holland. Franciscus. 



" " 7. Frobes, 2 Mairan, and Acad. Coll. 



1625. Sept. 7. Mairan, Short, and Acad. Coll. 

 " " 17. Kirch, Mairan, and Acad. ColL 

 " " 30. Mairan, Short, and Acad. C.ll. 

 " Oct. 10. Kirch, Mairan, and Acad. Coll. 

 " Nov. 3. Kirch, Mairan, and Acad. Coll. 



1626. Feb. 5. Kirch, Mairan, and Acad. Coll. 

 " May 28. Kirch, Mairan, and Acad. Coll. 

 " June 26. Mairan, Short, and Acad. Coll. 

 " Aug. 8. Kirch. Mairan, and Acad. Coll. 

 " Sept. 17. Kirch, Mairan, and Acad. Coll. 

 " " 24. Kirch, Mairan, and Acad. Coll. 



1627. Jan. 17. Joachim, Bohemia. Lehmann. 

 " " 17. Frobes, Mairan, and Acad. Coll. 

 " " 21. Joachim. Lehmann. 



« " 21. Frobes, Mairan, and Acad. Coll. 



1628. Jan. x. Kirch, Mairan, and Acad. Coll. 

 " April 27. Pfaff. Boguslawski. 8 Boue. 

 « " 30. Pfaff. Bogusla«>ki. Bou& 



" Dec. 20. Mairan, Short, and Acad. Coll. 



" ' " 26. Mairan, Short, and Acad. Coll. 



" " 28. Mairan. Short, and Acad. Coll. 



" " 30. Kirch, Mairan, and Acad. Coll. 



1629. Jan. 5. Kirch, Mairan, and Acad. ColL 

 " '■ 11. Kirch and Mairan. 



" Mar. x. ? Meissen. Jonston. 4 Frobes. 



" June x. Zurielt. Wagner. Frobes. 



" Aug. 21. Kirch, Mairan, and Acad. Coll. 



" Sept. 19. Kirch, Mairan, and Acad. Coll. 



" " 20. Kirch, Mairan, and Acad. Coll. 



" " 21. Kirch, Mairan, and Acad. Coll. 



" Oct. 1. Mairan, Short, and Acad. Coll. 



" " 2. Kirch, Mairan, and Acad. Coll. 



" " 16. Mairan, Short, and Acad. Coll. 



" " 26. Kirch, Mairan, and Acad. Coll. 



« « 29. Mairan, Short, and Acad. Coll. 



" " 30. Kirch, Mairan, and Acad. Coll. 



1 Thompson's Meteorology, p. 350. 



2 Baudartius, Historia Eceles. et Polit. Lib. XVI. 

 8 Wiirtemberg Jahrbuch fur 1850. I. 



* Thaumatographia Xaturalis, ic. 



