AURORAS OBSERVED AT CAMBRIDGE. 



clouds, which usually accompany the Aurora 

 Borealis, appeared scattered over the north, 

 at about 5° to 10° above the horizon. 



103 Sept. 11. Aurora. 



104 " 22. Aurora from 8 h to 9 h in the evening. 



105 " 23. Aurora, low. 



106 Oct. 7. Very brilliant and active Aurora. 



The night of the 7-8 was remarkable for its 

 beauty and the fine display of Northern Lights. 

 The formation of cloud in immediate connec- 

 tion with the Aurora was watched with great 

 interest. The apparent process was this. 

 From the strong light of the arch, whose apex 

 was high, and the inner part deep red, the 

 streamers shot upward, and then formed in 

 succession. Vapory light very faint, stronger 

 light in mass. From this, or in the same direc- 

 tion, was gradually formed" cirrus and cumulus, 

 from which the moonlight was strongly re- 

 flected, and of steady outline. The usual dark 

 wane clouds were formed below. 



107 " 19. Aurora with wane. 



108 " 21. Aurora at 10 h P. M. 



109 Dec. 9. Bright auroral arch 10°. Streamers 



in the N. W. 



1847. 



110 Feb. 6. Auroral light with wane clouds. 



111 Mar. 8. Northern Lights at 9 h P. M. 



112 " 19. At evening auroral arch 10°, apex 

 3° east of north, increased to one of the most 

 lively and brilliant displays on record. 



113 Apr. 7. Northern Lights strong, between 



dark cumulus. 



114 " 16. Aurora at 9 h , P. M.. low. 



115 May 15. Auroral arch, altitude 5°, at 9 h P. M. 



116 Aug. 3. Aurora 5°, ll h to 12 h , broken by l h . 



117 •• 21. About midnight a splendid Aurora, 

 colored deeply with red. 



118 Sept. 29. A splendid auroral display at 8 b to 



9 h P. M. Some masses looking like the spec- 

 trum of a prism, others of a brilliant red or 

 rose color.' One remained stationary for an 

 hour in the S. E., at an altitude of 30°. 



1848. 



119 Jan. 28. Strong Aurora, with deep red light. 



but interrupted by clouds, at 8 h 30 m P. M. 



120 Feb. 24. Auroral light, strong. Several bril- 



liant displays of Northern Lights this month. 



121 Mar. 8. Aurora low and diffused, at 9 h P. M. 



122 " 22. Aurora. 



123 « L'4. Aurora. At 9 h , a fine, steady, well- 



defined arch. At I0 h 30™, merry dancers, bril- 

 liant, casting strong shadows. 



124 Mar. 25. Slight Aurora, low' and diffused. 



125 Apr. 5. Brilliant, active Aurora, at ll h 4 m . 



126 " 6. Aurora at 9 h P. M. Extensive and 

 diffused at 10" 3() m . 



127 " 15. Aurora, brilliant arch and streamers 

 at 9 h P. M. 



128 May 25. Aurora. A beam shot from a cloud 



near the horizon to Polaris ; exactly in direc- 

 tion, a little short in distance. 



129 " 31. Aurora. 



130 July 11. Splendid Aurora up to zenith ex- 



tending to the south and east. At 10 h , fine. 



131 Oct. 6. At 9 h P. M., a very curious and re- 



markable ridge of light resembling a comet's 

 tail, or a light thin cloud, seen in the X., 

 extending from the horizon up to the ze:r b, 

 moving slowly off to the southward, at the 

 rate of about a degree a minute, retain- 

 ing its curved appearance as when first no- 

 ticed. Supposed it to be auroral light. 



132 " 25. Bright Aurora diffused with wane. 



133 Nov. 17. Bright Aurora shining through Ihe 



clouds, like moonlight. 



134 " 21. Aurora. 



135 " 22. Aurora. 



136 Dec. 23. Northern light, diffused, altitude 10°. 



1849. 



137 Feb. 19. Aurora from 10" to 12\ At mid- 



night, quite bright arch, apex 15°, broken at 

 N. W., colored red. 



138 Mar. 17. Strong Aurora. 



139 May 12. Aurora from 9" to 10 h P. M., altitude 



7°, broken arch. 



140 July 13. Aurora from 9" to 10* P M., slight 



auroral arch. 



1850. 



141 Mar. 4. Strong Aurora, also the same on 



the two preceding nights. 



142 " 11. Aurora, at 9 h P. M. 



143 " 31. Bright_Aurora with clouds floating 

 in the north. 



144 April 2. Slight Aurora during night. 



145 " 6. Aurora at 9 h P. M., a fine arch with 

 streamers, and very bright patches and cirro.- 

 stratus clouds below and among. 



146 " 7. Aurora with streamers and clouds. 



147 May 3. Fine auroral arch at 9 h P. M. 



148 " 7. Fine Aurora from 14 h to 15 h 



