Observations in France on the Aurora of 1859. 391 
extended from Cerberus to Leo Minor, having an amplitude of 
more than 100°. The exhibition continued until the morning 
twilight, A motion of translation from W.SW to E.SE. 
suspected, but the motion was not very appreciable. When the 
aurora appeared in its greatest brilliancy, the substance which 
composed it appeared to be in a state of great agitation; and 
the rays exhibited a red color, sometimes like that of iron heated 
to redness and sometimes to a white heat, The space occupied 
by the small arch was, as usual, of a greenish color; the centre 
near the horizon being black, and the whole destitute of rays. 
The aurora exhibited the greatest brilliancy between the W. and 
N.E. points of the horizon. A few cirrus clouds were noticed 
_ during the exhibition; they were all black, without any reflec- 
_ tion of the light of the aurora, proving that this light emanated 
mM aregion much above that of the clouds. 
Magnetic effects of the Aurora; from the Comptes Rendus, 
T. XLrx, p. 473. 
 Onthe 26th of August some anomalies were noticed in the 
_ hotions of the magnetic instruments at the Observatory of Paris, 
the declination having changed 22’ between 94 A. M. and noon. 
Aug. 28th at 5 p.m. the motion of all the magnetic instru- 
 ‘ients was very irregular. Between midnight an of 
Aug. 29th the horizontal intensity varied 0:0074. At 9 A.M. of 
_ the 29th the horizontal intensity had diminished by 0°01, while 
the vertical component had increased 0-0013. 
uring the forenoon of the 29th the declinometer was very 
— ‘huh disturbed, and at 11 A. M. it oscillated 41’ on each side of 
_ “Sean position. Towards evening the disturbances disap- 
peared; but a fresh disturbance commenced on the Ist of Sep- 
- ‘lember, at 114 30m 4. wr, About 4P.a. Sept. 2d, there commenced 
_ §leW magnetic storm, more violent than that of Aug. 29th. The 
’ Magnets were carried beyond the range of their scales, showing 
: 4 change of the horizontal intensity exceeding 0-014, but as the 
_ \Sttvations were only recorded photographically, the extreme 
_ "ge could not be determined. 
Effect on the Telegraph Wires, from the Comptes Rendus, 
'T. xirx, p. 360. 
4 asm the evening of Aug. 28th until the morning of the 29th 
heedles of the magnetic telegraph at Paris were almost con- 
«S$ Was again int ted, the needles were disturbed, an 
the bells were Fang. ithe 
