172 TRANSACTIONS OF THE [APR. 2, 
graph room to make the final records and computations. I 
came out at 10 o’clock and was at once surprised by the rapid 
wave-like motions of the auroral light. I stood watching the 
phenomena for fifteen minutes and then walked away keeping 
face to the north. By 10:20 I could see no more motion, nor in 
fact any aurora. I continued to look for the aurora until 11 
o'clock. I was again at the observatory from 2:20 to 5 o’clock 
the next morning and saw no aurora. 
“ This aurora was to me the most remarkable one I have ever 
seen in respect to the wave motion. Great masses of banded 
light were distributed from the west to the east extending to 
and beyond the zenith. In the west there was quite a dull red 
color. All the time there was a rapid wave-like pulsation which 
passed from the horizon to the zenith in a couple of seconds. 
These waves were, it seemed to me, about 8 to 10 degrees in ver- 
tical extension and about 16 to 20 degrees in east and west di- 
rection. The motion made me imagine the resemblance to great 
white flags that were moved by a stiff breeze. Such flags 
seemed to be distributed so as to cover about 180 degrees at the 
horizon from the east point to the west point and to contract 
toward the zenith. 
“The aurora of March 30th, 1894, was observed by me from 
the roof of ‘The Dakota,’ from which a clear view, not very 
badly interrupted by the city lights, could be had of the horizon 
except toward the south. 
‘“T began my observations at 8:20 o’clock, and continued them 
till about 10. Three things were especially noteworthy: 1. The 
beautiful rosy and pink colors in the east and west at times. 
2. The radiation of the aurora from the zenith in all directions, 
the remarkable southern extension being greater than I have 
ever previously beheld it. 3. The very peculiar zenithal de- 
velopment, which showed a ring formation. <A cloud-like ring 
some 3 degrees wide and having an inner radius of about 10 de- 
grees showed itself whenever the light pulsations spread to the 
zenith, and from this ring the radiated streamers extended in all 
directions. The ring did not always keep the same place, but 
appeared to my eye to occupy a slightly different place at each 
