84 Prof. E. Loomis on the Aurora of 1859. 
cases when an aurora was seen at Hobarton it was cloudy at 
New Haven, and there were eight other corresponding cases in 
which an aurora was seen at some one of the Academies in New 
York, although not noticed at New Stevens In four additional 
cases an aurora was seen at Toronto, yas none was recorded 
at New Haven or in the State of New 
There pos then only 11 cases of anova at Hobarton for 
which we do not find corresponding observations from one o 
these three sors in the northern hemisphere, and in eight of 
these cases the sky was overcast from New Haven to Toronto. 
The following are the dates of these auroras, and opposite to 
the dates I have placed notices of auroral or magnetic phenom- 
ena from Teleg station in the northern hemisphere. 
1841, Slay’ 11, Unusual magnetic disturbance at Greenwich, Eng. - 
1842. Jan. 1, Unusual magnetic disturbance at Greenwic h. 
Feb. 18, | Unusual magnetic disturbance at Greenwich. 
Aurora at Christiana, way. 
May 16, Unusual magnetic disturbance tee ee and Greenwich. 
Dee. 31, Magnetic disturbance at Gree 
1844. April 25, Unusual magnetic asiibiaen: s Philadelphia and To- 
on 
r 
1847, April 21, Unusual magnetic disturbance at Greenwich. 
Sept. 24, Aurora 9 to 10 at Greenwich. 
Sept. 25, Unusual magnetic disturbance at Greenwich. 
Sept. 26, | Unusual magnetic disturbance at Geestrvicks 
pipes at ar England. 
1848. Dec. 21, Aurora in Newfoundland. 
It thus appears that in poe instance when an aurora was ob- 
served at Hobarton, an aurora was seen on the same day in the 
northern hemisphere; or there were observed unusual disturb- 
ances of the magnetic instruments, ee the existence of 
an aurora at no very remote station. So far then as a conclu- 
should infer that whenever an aurora is seen at Hobarton, where 
the magnetic dip is —70°, an aurora occurs at some place in the 
northern hemisphere as far south as where the magnetic dip does 
not much exceed 75°; in other words, an unusual auroral dis- 
play in the southern hemisphere is car accompanied by an 
unusual display in the northern hemisphere. As any cause 
which affects the intensity of the magnetism at one pole of a 
wnt usually affects the other pole, so an exhibition of auro- 
ight about one magnetic pole of the earth, is uniformly 
attended by a prem ig exhibition of auroral light about 
the opposite magnetic pol 
New Haven, May, 1861. 
