Prof. E. Loomis on the Aurora of 1859. 319 
We thus see that in twenty-one cases out of thirty-four, an au- 
rora was recorded at Christiania within twenty-four hours of an 
aurora at Hobarton ; and considering the number of auroras which 
must be rendered invisible by clouds and by day-light, we may 
safely conclude that almost every auroral exhibition at Hobarton 
is accompanied by a nearly simultaneous exhibition in Norway. 
In successive numbers of this Journal, commencing with No- 
vember, 1859, we have given a full report of observations upon 
the great auroral exhibition of August and September, 1859. 
This display was probably unsurpassed by any similar phenom- 
enon on record, not only for its magnificence, but also for its 
as 
made of the auroral light. It hence appears highly probable 
that this auroral display extended to every meridian of the 
northern hemisphere. ‘he aurora of Sept. 2d was observed at 
turbance of the magnetic instruments was well nigh unprece- 
ented for its violence, so that we cannot doubt that this display 
The auroral display in the southern hemisphere was cotem- 
Poraneous with that in the northern, and was perhaps — 
Temarkable. Both of these auroras were observed in So 
merica and in Australia, in latitudes where such exhibitions 
y rare. : ages 
The southern limit of these auroral displays was not the same 
upon all meridians. In North America, the aurora of Ave 28th 
h as lat. 18°. In Central 
ith of places as far south 
as about lat. 45°. It was brilliant at Rome in Jat. 42°, but _was 
Not noticed at Athens in lat. 88°; neither was 1t seen 1n West- 
Asia in lat. 40°. 
