OF THE AURORA BOREALIS ON THE MAGNETIC NEEDLE. 
109 
many falls since the 20th December, with a nearly steady frost, generally 
from 30° to 35° Fahr., but once or twice as low as 12° at sunrise. Wind since 
that time till now in all points, except W. and S. W. 
January 27th. — Again frost and calm. Therm. 30°. Intensity 225".25. 
January 28th, 8 p. m. — Several low arches of Aurora of great brilliancy, with 
many streamers over clouds resting on the Coreen hills. Rest of the sky quite 
clear. Needle steady. Therm. 25°. 
^ past 8. — An arch has come slowly forward and passed the zenith into the 
plane of the dip ; its west part fading as it reaches that position ; but the east 
part from the mag. merid. continuing moderately bright. Needle shifted to 
21' 30" E. or towards the bright part. Intensity 225".25. After this observa- 
tion, needle on steel point returned slowly to 6' E. 
5 min. before 9. — Another very bright arch, about 3° broad at the vertex, 
and extending nearly from the E. to the W. horizon, but narrowing much at its 
extremities, came forward into the plane of the dip. The light of this very 
beautiful arch was nearly uniform from end to end. Sky quite clear, when it 
was in the plane of the dip, excepting over the Coreen hills, where there were 
still many clouds. Needle on steel point moved incessantly at this time, but 
irregularly and somewhat fitfully, alternately to E. and W. within the limits of 
about 30' in all. Intensity 226". Arch faded slowly about 30° S. of the zenith; 
and needle on steel point returned to rest nearly at zero. 
Many falling stars in paths parallel to the streamers, i.*,e. to pencils of rays 
of the Aurora, were they at the same places. 
Many low arches rose in succession after this to about 25° above the Coreen 
hills ; some of them with very brilliant streamers. Needle steady. A slight 
steady breeze a point or two S. of W. set in after 9 p. m. At 1 1 p. m. therm. 24°. 
January 29th. — Therm. 36°. A steady gale all day, a point or two S. of W. 
till sunset, when it shifted to N., and therm, fell to 30°. 8 p. m. Intensity 225".25 . 
February 6th and 7th. — Steady moderate frost till now, when there occurred 
a terrible storm at S.S.E. with a heavy fall of snow. At 8 p. m. of 6th, therm. 
27°. Intensity 225".5. 
It will be seen that the observations now detailed confirm the result of those 
I formerly sent, viz., that the magnetic needle is disturbed by the Aurora only 
