ON THE SECULAR PERIODICITY 



THE AURORA BOR \LIfl 



K>9 



brilliant, the very brilliant specimens being printed in < f ics, and a few of a highly 



signalized by an asterisk. Of brilliant auroraa, ir>7 



as very brilliant, and \ as highly extraor- 



extraordinary character being 



are registered : of these 81 are designated 



dinary. 



1827. Augmt 28* 



1828. August 16, September 8, September 29, Octo- 



ber 8. 



1829. June 1, June 7, September 26, November 9, 



December 28. 



1 830. March 15, April 19, May 2, June 10, June 1 1, 



July 14, July 15, August 19, August 20, 

 September 15, October 28, December 7, De- 

 cember 10, December 11. 



1831. January 7, February 6, March 8, March 18, 



April 1, April 18, April 19* 4pr*7 20, 

 June 10, June 21, JWy 3, ./wfy 4, October 

 29, December 9. 



1 832. August 22, August 23, August 24. 



1833. ^fareA 1 7, J% 1 6, J!% 1 7, June 29, July 1 0, 



September 5, November 3, December 29. 



1834. October 8, November 2. 



1835. January 4, August 19, September 4, Septem- 



ber 22, November 17, November 18. 



1836. April 19, JjwtY 22, ^n7 23, Jl% 8, May 19, 



July 31, August 2, August 12. 



1837. January 14, April 6, ,/ttfy 1, Ocifo5<?r 22, No- 



vember 12, November 14. 



1838. February 20, February 21, July 27, August 



22, September 14, September 15, September 

 16, November 9, November 26. 



1839. January 10. January 14, March 5, May 5, 



June 7, August 28, September .'J.* October 



10. 



1 840. January 3, May J 9. 



1841. February 2'!. Jfi/rrA 23, /mt 1 .*. July 29 



August 1, August 6, September 25, October 

 5, November 18. 

 18 12. >4/>n7 11, .June 4, July .'5. August 5. 



1843. March 7, ^junV 15, Ju, June 22, AupiM 



3, October 5. 



1844. February A, October "_'i». November 1, Decem- 



ber 15. 



1845. January 8, January 9, February 25, April LI 



November 3, December 3. 



1846. March 25, May 30, Jk£w« f., September 28, 



October 2, December 9. 



1847. January 17, February 21, March 1 '.), April 6, 



April 7, August 4. August 29, October 21. 

 November 1, November l'">. I '* ml)er 7. 



1848. January 6, January 1 6, February 8, February 



18, February 21, March 23, April 1. April 

 5, ^n7 6, July 3, July 11, July 12, .July 

 23, August 14, August 21, Onolter S !, 

 November 17,* November 18, November 

 26, December 27. 



1849. July 24. 



Dr. Holyoke's Journal furnishes positive testimony in favor of a conclusion which had 

 been adopted already from negative evidence; from the absence, that is, of any descrip- 



f a remarkable aurora seen in this country d 



the present century bef< 



1827, although the Memoirs of the American Academy of Arts and Sciences in Boston 



the Tran 

 American 



of the Philosophical Society of Philadelphia, and, after 



18 



Journal of Scie 



were in 



and would have furnished a con- 



venient medium for the publication of any aurora which deserved the attention of the 

 scientific world. Therefore, as Professor Olmsted remarks, « the splendid arch and 

 other striking accompaniments of the aurora of August, 1827, took us by surprise, and 

 were viewed with wonder by nearly all the existing generation of the countries where 

 it was visible." f Mr. Felt says that it caused much apprehension lest the end of all 



* 



Red 



f Smithsonian Contributions, VIII. 6. 



VOL. LX. 



18 



