40 Prof. E. Loomis on the action of Electrical Currents, 



1840. Oct. 22, From 15^ to IS"* faint auroral light. 



Dec. 23. lYt^ Bank of auroral light in N. ; faint streamers. 



18h. Auroral light in N. Patches of light and streamers, 



19h. Faint auroral light in N. 



1841. April 21. 15^. Auroral light in N, horizon; a few faint stream- 



2 Oh. Fainl auroral light to N. 

 July 21. I7h SO'". Bright bank of auroral light in N. 

 19h. Faint aurorallight in N. 

 20h. Faint auroral light in N". 

 21^ Faint auroral light in N. 

 Oct 20. 14'' 35™. Auroral light in N. 



15f» 20"'. Very faint auroral light along N. horizon. 

 The following notices of the aurora were recorded at Wash- 

 ington. The dates are given in the mean time of the place. 



Auroral observations at Washington, 

 1840. Aug. 28. From S* 30™ to ^^ 45'" p. m. the aurora distinctly visi- 

 ble, extending from N.E. by N. to N.W. by N. ; faint 

 appearances of it at irregular intervals, until l** 45°" 

 A. M. of 29th. 

 Sept. 23. At lO'' 40™ p. M. a segment of an auroral arch, extend- 

 ing from N.N.E, to N.N.W, ; centre or highest point, 

 N. by E. ; altitude 8°. 

 The following auroral notices are from the register kept at 

 New Haven bj Mr. E. C. Herrick. 



Auroral observations at New Haven. 



1840. May 29. A conspicuous aurora, A narrow belt overhead be- 



tween gJ* and 10*; and after lO'' auroral waves as 



high as zenith. 

 Aug. 28. A considerable aurora visible, hw arch 40° high in 



K between 10'' and 11*. Few streamers, 

 Oct 22. A distinct aurora. An arch 2° or 3° high lying 30* or 



40° along the northern horizon. 

 Dec. 24. During most of the evening there seemed to be a faintlf 



luminous vapor, particularly in the N., but also more 



or less elsewhere. 



1841. March 24. An auroral arch low in N. horizon all evening; abotrt 



2° high ; bright, I saw no streamers. 

 July 21. A faint auroral illumination at 10 p. m. and also at 2 



A. M. of the 22d. 

 Oct 21. About 1 A.M. a brilliant auroral display, not extending 



higher than 40° ; streamers rapidly shifting. 



1842. April 20. Slight aurora about llS and faint traces through the 



If now we make the comparison for those dates at which an 

 aurora was recorded at Toronto, we shall find that the maxiaia 

 and minima deviations of the magnetic needle occurred at Cam- 



