120 



ON THE SECULAR PERIODICITY 



AURORA 



1827. 

 598 Sept. 8. Brilliant Aurora Borealis 



599 « 2">. Aurora Borealis. 



1828, 1829, none. 



1830. 



600 June 10. Aurora Borealis. 



601 



G08 



- 11. Aurora I.orealis 



02 Dec. 11. Brilliant Aumra Boreali 



1831-1831. none. 



1835. 

 603 Nov. 17. Aurora Borealis. 



604 •* 18. Aurora Borealia. 



1836. 



605 April 22. Aurora Bor<alis. 



1887. 



606 -July 1. Aurora Borealis. 



607 Dee. 1. Aurora Borealis. 



• '4. 



Aurora Borealis in evening, 



1 8 38. 



612 Sept. 16. Aurora Boreali 



613 Nov. 12. (10 h ,P.M.) Aurora Borealis. From 



614 

 615 



617 



622 



s in evening. 



^. 



u 



11 to 12 very bright. 

 14. (9 h , P. M.) Aurora Borealis 

 25. Aurora Borealis. 



1839. 



616 June 14 



(7 h , P. M.) Aurora Borealis. At 10, 



" 19 



brilliant. 

 Evening. 



- 



Aurora Borealis. From 9 



to 10 bright. 



618 Sept. 3. Aurora Borealis, 



1840. 



619 May 29. Aurora Borealis. 



620 Aug. 28. (9 h to 12 h , P. M.) Aurora Borealis. 



At 11, very bright. 



1841. 



621 Feb. 22. (8 h to 9 h , P. M.) Aurora Borealis. 



« 



23. (ll h , P. M.) Aurora Borealis. 



1847. 



809 I k 21. 1 brilliant Aurora Boreali,. At 7, PJ "" ApriI 7 " Aurora Bore ^ ^ 10 fc , P. M., to.SN 



M., of a beautiful color; at 10, P, 

 M., of a pale color. 



610 July 15. Aurora Boreali*. 



611 Sept. 18, Aurora Borealis in evening. 



A. M., next morning. 



1848. 

 624 April 6. (10 h to ll h , P. M.) Brilliant Aurora 



Borealis. 



