408 Aurora of 1859. 
In order to render the communications of observers more defi- 
nite and precise, we will briefly indicate the kind of information 
we desire. 
We desire an accurate but concise description of all the phe- 
nomena with the exact time of their occurrence 
1. If a dark segment was seen resting either on the northern 
or southern horizon, or both of them, its altitude and position 
should be accurately stated. 
2. If the streamers were seen to converge to a single point of 
the heavens, this point should be accurately located and the time 
of observation given. 
3. If any single phenomenon (such as a detached luminous 
arch extending from the east to the west horizon) was so con- 
spicuous as to be easily identified, it is important to have an ac- 
curate statement of its position and the altitude of its vertex, 
with the time of its formation and disappearance. 
4, Was the Aurora seen in the southern half of the heavens, 
and how near the southern horizon did it exten 
5. Describe the color of the light, as well as its intensity. 
: e Aurora exhibited any great variations of brilliancy 
it is important to know the times of least as well as the times of 
greatest brilliancy. . 
. Did the Aurora exhibit any sudden flashes? Were there 
any pulsations like waves of light rushing up from the horizon ? 
any observations were made showing the influence of 
the Aurora upon the magnetic needle, it is desirable that they 
should be communicated in detail. 
9. The kind and degree of influence exerted upon telegraph 
wires. 
ed to 
present an analysis of the whole, with some speculations on the 
eral subject of Auroras. Observers may forward their com- 
munications either to the “Editors of the Journal of Science, 
New Haven, Ct.,” or to “Prof. Elias Loomis, New York City, 
who has consented to undertake the discussion of the phenomena. 
Posiscript.—Any exact data, relating to the remarkable auro- 
ral arch of April 29, 1859—mentioned by Mr. Herrick on p. 
of this volume, will de very acceptable. | 
