350 
particularly when the aurora has previously formed an 
arc, stand parallel, in such a manner that the lower, in- 
tensest, ends nearly follow the track of the former arc. 
Bunches of streamers, standing high in the sky, are often 
fan-shaped, the broadest part pointing downwards. The 
intensest streamers have very clearly defined edges, but | 
NALTORLE 
[August 13, 1885 
from these there are all sorts of variations down to the 
streak of light hardly visible. At the side of, and between 
very intense and defined streamers, the sky seems, by the 
contrast, unusually dark, and this may, perhaps, explain 
the d/ack streamers which some observers claim to have 
seen. 
Fic. 8.—Bands and streamers (Koutokzino). 
“ 
The points of the streamers are usually faint and with | 
no sharp line of demarcation. The stars shine through | 
the streamers as through all other forms of the aurora, | 
and it may, indeed, be a matter of doubt whether the | 
strength of light of the aurora is ever great enough to | 
outshine a bright star.” ,. . 
“ The motion of the streamers is twofold. First, longi- 
tudinally, as they strike upwards or downwards; and 
secondly, laterally, as they travel parallel either to the left 
or right. Sometimes this motion is slow, sometimes very 
quick, and particularly in the latter case the observer 
| obtains the impression that the colonnade of streamers 
